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Guo X, Ji X, Liu Z, Feng Z, Zhang Z, Du S, Li X, Ma J, Sun Z. Complex impact of metals on the fate of disinfection by-products in drinking water pipelines: A systematic review. WATER RESEARCH 2024; 261:121991. [PMID: 38941679 DOI: 10.1016/j.watres.2024.121991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 06/14/2024] [Accepted: 06/21/2024] [Indexed: 06/30/2024]
Abstract
Metals in the drinking water distribution system (DWDS) play an important role on the fate of disinfection by-products (DBPs). They can increase the formation of DBPs through several mechanisms, such as enhancing the proportion of reactive halogen species (RHS), catalysing the reaction between natural organic matter (NOM) and RHS through complexation, or by increasing the conversion of NOM into DBP precursors. This review comprehensively summarizes these complex processes, focusing on the most important metals (copper, iron, manganese) in DWDS and their impact on various DBPs. It organizes the dispersed 'metals-DBPs' experimental results into an easily accessible content structure and presents their underlying common or unique mechanisms. Furthermore, the practically valuable application directions of these research findings were analysed, including the toxicity changes of DBPs in DWDS under the influence of metals and the potential enhancement of generalization in DBP model research by the introduction of metals. Overall, this review revealed that the metal environment within DWDS is a crucial factor influencing DBP levels in tap water.
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Affiliation(s)
- Xinming Guo
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150096, China
| | - Xiaoyue Ji
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150096, China
| | - Zihan Liu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150096, China
| | - Zhuoran Feng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150096, China
| | - ZiFeng Zhang
- International Joint Research Center for Persistent Toxic Substances (IJRC-PTS), State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Shuang Du
- Institute of NBC Defense. PLA Army, P.O.Box1048, Beijing 102205 China
| | - Xueyan Li
- Suzhou University Science & Technology, School of Environmental Science & Engineering, Suzhou 215009, China
| | - Jun Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150096, China
| | - Zhiqiang Sun
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150096, China.
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2
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Mitchell J, Li H, Weir MH, Libarkin J, Pasek E. Development and evaluation of an intensive short course: the Quantitative Microbial Risk Assessment Interdisciplinary Instructional Institute (QMRA III). JOURNAL OF MICROBIOLOGY & BIOLOGY EDUCATION 2024; 25:e0021623. [PMID: 38899898 DOI: 10.1128/jmbe.00216-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 05/14/2024] [Indexed: 06/21/2024]
Abstract
Quantitative microbial risk assessment (QMRA) is a growing interdisciplinary field addressing exposures to microbial pathogens and infectious disease processes. Risk science is inherently interdisciplinary, but few of the contributing disciplinary programs offer courses and training specifically in QMRA. To develop multidisciplinary training in QMRA, an annual 10-day long intensive workshop was conducted from 2015 to 2019-the Quantitative Microbial Risk Assessment Interdisciplinary Instructional Institute (QMRA III). National leaders in the fields of public health, engineering, microbiology, epidemiology, communications, public policy, and QMRA served as instructors and mentors over the course of the program. To provide cross-training, multidisciplinary teams of 5-6 trainees were created from the approximately 30 trainees each year. A formal assessment of the program was performed based on observations and surveys containing Likert-type scales and open-ended prompts. In addition, a longitudinal alumni survey was also disseminated to facilitate the future redevelopment of QMRA institutes and determine the impact of the program. Across all years, trainees experienced statistically significant increases (P < 0.05) in their perceptions of their QMRA abilities (e.g., use of specific computer programs) and knowledge of QMRA constructs (e.g., risk management). In addition, 12 publications, three conference presentations, and two research grants were derived from the QMRA III institute projects or tangential research. The success of QMRA III indicates that a short course format can effectively address many multidisciplinary training needs. Key features of QMRA III, including the inter-disciplinary training approach, hands-on exercises, real-world institute projects, and interaction through a mentoring process, were vital for training multidisciplinary teams housing multiple forms of expertise. Future QMRA institutes are being redeveloped to leverage hybrid learning formats that can further the multidisciplinary training and mentoring objectives.
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Affiliation(s)
- Jade Mitchell
- Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, Michigan, USA
| | - Hongwan Li
- Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, Michigan, USA
| | - Mark H Weir
- Division of Environmental Health Sciences, The Ohio State University, Columbus, Ohio, USA
| | - Julie Libarkin
- Department of Earth and Environmental Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Emily Pasek
- Department of Earth and Environmental Sciences, Michigan State University, East Lansing, Michigan, USA
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3
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Majumdar S, Gogoi D, Boruah PK, Thakur A, Sarmah P, Gogoi P, Sarkar S, Pachani P, Manna P, Saikia R, Chaturvedi V, Shelke MV, Das MR. Hexagonal Boron Nitride Quantum Dots Embedded on Layer-by-Layer Films for Peroxidase-Assisted Colorimetric Detection of β-Galactosidase Producing Pathogens. ACS APPLIED MATERIALS & INTERFACES 2024; 16:26870-26885. [PMID: 38739846 DOI: 10.1021/acsami.4c01565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Pathogen detection has become a major research area all over the world for water quality surveillance and microbial risk assessment. Therefore, designing simple and sensitive detection kits plays a key role in envisaging and evaluating the risk of disease outbreaks and providing quality healthcare settings. Herein, we have designed a facile and low-cost colorimetric sensing strategy for the selective and sensitive determination of β-galactosidase producing pathogens. The hexagonal boron nitride quantum dots (h-BN QDs) were established as a nanozyme that showed prominent peroxidase-like activity, which catalyzes 3,3',5,5'-tetramethylbenzidine (TMB) oxidation by H2O2. The h-BN QDs were embedded on a layer-by-layer assembled agarose biopolymer. The β-galactosidase enzyme partially degrades β-1,4 glycosidic bonds of agarose polymer, resulting in accessibility of h-BN QDs on the solid surface. This assay can be conveniently conducted and analyzed by monitoring the blue color formation due to TMB oxidation within 30 min. The nanocomposite was stable for more than 90 days and was showing TMB oxidation after incubating it with Escherichia coli (E. coli). The limit of detection was calculated to be 1.8 × 106 and 1.5 × 106 CFU/mL for E. coli and Klebsiella pneumonia (K. pneumonia), respectively. Furthermore, this novel sensing approach is an attractive platform that was successfully applied to detect E. coli in spiked water samples and other food products with good accuracy, indicating its practical applicability for the detection of pathogens in real samples.
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Affiliation(s)
- Sristi Majumdar
- Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
| | - Devipriya Gogoi
- Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
| | - Purna K Boruah
- Department of Chemistry, Faculty of Science, Kyushu University 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Ashutosh Thakur
- Coal and Energy Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Priyakhee Sarmah
- Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
| | - Parishmita Gogoi
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sanjib Sarkar
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Priyakshi Pachani
- Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
| | - Prasenjit Manna
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ratul Saikia
- Biological Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Vikash Chaturvedi
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune, MH 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manjusha V Shelke
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune, MH 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manash R Das
- Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat, Assam 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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4
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Waegenaar F, García-Timermans C, Van Landuyt J, De Gusseme B, Boon N. Impact of operational conditions on drinking water biofilm dynamics and coliform invasion potential. Appl Environ Microbiol 2024; 90:e0004224. [PMID: 38647288 PMCID: PMC11107155 DOI: 10.1128/aem.00042-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Accepted: 03/27/2024] [Indexed: 04/25/2024] Open
Abstract
Biofilms within drinking water distribution systems serve as a habitat for drinking water microorganisms. However, biofilms can negatively impact drinking water quality by causing water discoloration and deterioration and can be a reservoir for unwanted microorganisms. In this study, we investigated whether indicator organisms for drinking water quality, such as coliforms, can settle in mature drinking water biofilms. Therefore, a biofilm monitor consisting of glass rings was used to grow and sample drinking water biofilms. Two mature drinking water biofilms were characterized by flow cytometry, ATP measurements, confocal laser scanning microscopy, and 16S rRNA sequencing. Biofilms developed under treated chlorinated surface water supply exhibited lower cell densities in comparison with biofilms resulting from treated groundwater. Overall, the phenotypic as well as the genotypic characteristics were significantly different between both biofilms. In addition, the response of the biofilm microbiome and possible biofilm detachment after minor water quality changes were investigated. Limited changes in pH and free chlorine addition, to simulate operational changes that are relevant for practice, were evaluated. It was shown that both biofilms remained resilient. Finally, mature biofilms were prone to invasion of the coliform, Serratia fonticola. After spiking low concentrations (i.e., ±100 cells/100 mL) of the coliform to the corresponding bulk water samples, the coliforms were able to attach and get established within the mature biofilms. These outcomes emphasize the need for continued research on biofilm detachment and its implications for water contamination in distribution networks. IMPORTANCE The revelation that even low concentrations of coliforms can infiltrate into mature drinking water biofilms highlights a potential public health concern. Nowadays, the measurement of coliform bacteria is used as an indicator for fecal contamination and to control the effectiveness of disinfection processes and the cleanliness and integrity of distribution systems. In Flanders (Belgium), 533 out of 18,840 measurements exceeded the established norm for the coliform indicator parameter in 2021; however, the source of microbial contamination is mostly unknown. Here, we showed that mature biofilms, are susceptible to invasion of Serratia fonticola. These findings emphasize the importance of understanding and managing biofilms in drinking water distribution systems, not only for their potential to influence water quality, but also for their role in harboring and potentially disseminating pathogens. Further research into biofilm detachment, long-term responses to operational changes, and pathogen persistence within biofilms is crucial to inform strategies for safeguarding drinking water quality.
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Affiliation(s)
- Fien Waegenaar
- Department of Biotechnology, Center for Microbial Ecology and Technology (CMET), Ghent University, Ghent, Belgium
- Center for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent, Belgium
| | - Cristina García-Timermans
- Department of Biotechnology, Center for Microbial Ecology and Technology (CMET), Ghent University, Ghent, Belgium
- Center for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent, Belgium
| | - Josefien Van Landuyt
- Department of Biotechnology, Center for Microbial Ecology and Technology (CMET), Ghent University, Ghent, Belgium
- Center for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent, Belgium
| | - Bart De Gusseme
- Department of Biotechnology, Center for Microbial Ecology and Technology (CMET), Ghent University, Ghent, Belgium
- Center for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent, Belgium
- Farys, Department R&D – Innovation Water, Ghent, Belgium
| | - Nico Boon
- Department of Biotechnology, Center for Microbial Ecology and Technology (CMET), Ghent University, Ghent, Belgium
- Center for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent, Belgium
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5
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Falcone MS, Salvinelli C, Sharpe T, Kamara A, Thomas E. Assessing the functionality of a water-vending kiosk network with high-frequency instrumentation in Freetown, Sierra Leone. Heliyon 2024; 10:e29152. [PMID: 38644828 PMCID: PMC11033098 DOI: 10.1016/j.heliyon.2024.e29152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 03/26/2024] [Accepted: 04/02/2024] [Indexed: 04/23/2024] Open
Abstract
Access to safe, reliable, and equitable water services in urban settings of low- and middle-income countries remains a critical challenge toward achieving Sustainable Development Goal 6.1, but progress has either slowed or stagnated in recent years. A pilot water kiosk network funded by the United States Millennium Challenge Corporation was implemented by the Sierra Leone Millennium Challenge Coordinating Unit into the intermittent piped water distribution network of Freetown, Sierra Leone, as a private-public partnership to improve water service provision for households without reliable piped water connections and to reduce non-revenue water. This study employs the use of high-frequency instrumentation to monitor, model, and assess the functionality of this water kiosk network over 2,947 kiosk-days. Functionality was defined via functionality levels on a daily basis through monitored stored water levels and modeled water withdrawals. The functionality levels across the kiosk network were found to be 34% operational, 30% offline, and 35% empty. Statistically significant (p < 0.001 ) determinants of functionality were found for several predictors across the defined thresholds. Finally, modeling of water supply, water demand and withdrawal capacity, and water storage was conducted to further explain findings and provide additionally externally relevant support for kiosk operations.
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Affiliation(s)
- Matthew S. Falcone
- Mortenson Center in Global Engineering and Resilience, University of Colorado Boulder, 4001 Discovery Drive, Boulder, 80301, CO, USA
| | - Carlo Salvinelli
- Mortenson Center in Global Engineering and Resilience, University of Colorado Boulder, 4001 Discovery Drive, Boulder, 80301, CO, USA
| | - Taylor Sharpe
- Mortenson Center in Global Engineering and Resilience, University of Colorado Boulder, 4001 Discovery Drive, Boulder, 80301, CO, USA
- Virridy, 1026 Lincoln Pl., Boulder, 80302, CO, USA
| | - Abrassac Kamara
- Sierra Leone Millennium Challenge Coordinating Unit, 23 Spur Road, Freetown, Sierra Leone
| | - Evan Thomas
- Mortenson Center in Global Engineering and Resilience, University of Colorado Boulder, 4001 Discovery Drive, Boulder, 80301, CO, USA
- Virridy, 1026 Lincoln Pl., Boulder, 80302, CO, USA
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6
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Thomson P, Pearson AL, Kumpel E, Guzmán DB, Workman CL, Fuente D, Wutich A, Stoler J. Water Supply Interruptions Are Associated with More Frequent Stressful Behaviors and Emotions but Mitigated by Predictability: A Multisite Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:7010-7019. [PMID: 38598435 DOI: 10.1021/acs.est.3c08443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Water supply interruptions contribute to household water insecurity. Unpredictable interruptions may particularly exacerbate water insecurity, as uncertainty limits households' ability to optimize water collection and storage or to modify other coping behaviors. This study used regression models of survey data from 2873 households across 10 sites in 9 middle-income countries to assess whether water supply interruptions and the predictability of interruptions were related to composite indicators of stressful behaviors and emotional distress. More frequent water service interruptions were associated with more frequent emotional distress (β = 0.49, SE = 0.05, P < 0.001) and stressful behaviors (β = 0.39, SE = 0.06, P < 0.001). Among households that experienced interruptions, predictability mitigated these respective relationships by approximately 25 and 50%. Where the provision of continuous water supplies is challenged by climate change, population growth, and poor management, water service providers may be able to mitigate some psychosocial consequences of intermittency through scheduled intermittency and communication about water supply interruptions. Service providers unable to supply continuous water should optimize intermittent water delivery to reduce negative impacts on users, and global monitoring regimes should account for intermittency and predictability in post-2030 water service metrics to better reflect household water insecurity experiences.
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Affiliation(s)
- Patrick Thomson
- Department of Engineering Science, University of Oxford, Oxford OX3 7DQ, U.K
- School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, U.K
| | - Amber L Pearson
- CS Mott Department of Public Health, Michigan State University, Flint, Michigan 48503, United States
| | - Emily Kumpel
- Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Danice B Guzmán
- Pulte Institute of Global Development, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Cassandra L Workman
- Department of Anthropology, University of North Carolina Greensboro, Greensboro, North Carolina 27412, United States
| | - David Fuente
- School of the Earth, Ocean and Environment, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Amber Wutich
- School of Human Evolution and Social Change, Arizona State University, Tempe, Arizona 85281, United States
| | - Justin Stoler
- Department of Geography and Sustainable Development, University of Miami, Coral Gables, Florida 33146, United States
- Department of Public Health Sciences, University of Miami, Miami, Florida 33136, United States
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7
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Hernández-Zepeda C, Negrete-Alcalde LJ, Rosiles-González G, Carrillo-Jovel VH, Abney SE, Betancourt WQ, Gerba CP, Chaidez-Quiroz C, Wilson AM. Human adenovirus-associated health risk in the recreational waters of the Yal-ku lagoon in the Mexican Caribbean. JOURNAL OF WATER AND HEALTH 2024; 22:372-384. [PMID: 38421631 PMCID: wh_2024_309 DOI: 10.2166/wh.2024.309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
The study objective was to evaluate human faecal contamination impacts in the Yal-ku lagoon in the Mexican Caribbean and to estimate adenovirus infection and illness risks associated with recreational exposure during water activities. A total of 20 water samples (10 from each site × two sites) (50 L) were collected monthly over a period of 12 months from two selected sampling sites in the swimming area of the Yal-ku lagoon. The occurrence of faecal-associated viruses was explored, and human adenovirus (HAdV) and pepper mild mottle virus (PMMoV) concentrations were quantified. A quantitative microbial risk assessment (QMRA) model was used to estimate exposure and subsequent adenovirus infection and illness risk for 1 h of swimming or snorkelling. Somatic and F + -specific coliphages occurred in 100% of the samples. Both HAdV and PMMoV were detected at a 60% frequency thereby indicating persistent faecal inputs. PMMoV concentrations (44-370 GC/L) were relatively lower than the concentrations of HAdV (64-1,000 GC/L). Estimated mean adenovirus risks were greater for snorkelling than for swimming by roughly one to two orders of magnitude and estimated mean illness risks for snorkelling were >32/1,000. Human faecal contamination is frequent in the Yal-ku lagoon, which is associated with human gastrointestinal illness.
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Affiliation(s)
- Cecilia Hernández-Zepeda
- Unidad de Ciencias del Agua, Centro de Investigación Científica de Yucatán, A.C., Calle 8, No 39, Mz 29, SM 64, CP 77524, Cancún, Quintana Roo, México E-mail:
| | - Luis Jorge Negrete-Alcalde
- Unidad de Ciencias del Agua, Centro de Investigación Científica de Yucatán, A.C., Calle 8, No 39, Mz 29, SM 64, CP 77524, Cancún, Quintana Roo, México
| | - Gabriela Rosiles-González
- Unidad de Ciencias del Agua, Centro de Investigación Científica de Yucatán, A.C., Calle 8, No 39, Mz 29, SM 64, CP 77524, Cancún, Quintana Roo, México
| | - Victor Hugo Carrillo-Jovel
- Unidad de Ciencias del Agua, Centro de Investigación Científica de Yucatán, A.C., Calle 8, No 39, Mz 29, SM 64, CP 77524, Cancún, Quintana Roo, México
| | - Sarah E Abney
- Water and Energy Sustainable Technology (WEST) Center, The University of Arizona, 2959 West Calle Agua Nueva, Tucson, AZ 85745, USA
| | - Walter Q Betancourt
- Water and Energy Sustainable Technology (WEST) Center, The University of Arizona, 2959 West Calle Agua Nueva, Tucson, AZ 85745, USA
| | - Charles P Gerba
- Water and Energy Sustainable Technology (WEST) Center, The University of Arizona, 2959 West Calle Agua Nueva, Tucson, AZ 85745, USA
| | - Cristóbal Chaidez-Quiroz
- Centro de Investigación en Alimentación y Desarrollo A.C., Laboratorio Nacional para la Investigación en Inocuidad Alimentaria, Culiacán, Sinaloa, México
| | - Amanda M Wilson
- Department of Community, Environment, & Policy, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
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8
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Espira LM, Gessese B, Kassa BA, Wu CC, Riley J, Bedru S, Sahilu G, Desta A, Baye K, Jones AD, Love NG, Eisenberg JNS. Multiscalar Evaluation of the Water Distribution System and Diarrheal Disease Risk in Addis Ababa, Ethiopia. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:13313-13324. [PMID: 37642551 PMCID: PMC10501120 DOI: 10.1021/acs.est.2c08976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 07/22/2023] [Accepted: 07/24/2023] [Indexed: 08/31/2023]
Abstract
Despite growing urbanization, our understanding of the impacts of water and sanitation on human health has largely come from studies in rural sectors. To this end, we collected data at both regional (water quality measures from water treatment systems) and community (cross-sectional surveys) scales to examine determinants of enteric pathogen infection and diarrheal disease among infants in Addis Ababa, Ethiopia. Regionally, the Legedadi water treatment plant had significantly lower heterotrophic plate counts, total coliform counts, and fecal coliform counts compared with the Gefersa water treatment plant. The number of pathogen types in infant stool also differed by plant. Decreases in chlorine levels and increases in the relative abundance of Gammaproteobacteria with distance from treatment plants suggest a compromised water distribution system. In communities, infants in households that obtained water from yard pipes or public taps had significantly lower odds of diarrhea compared to households that had water piped into their dwellings (OR = 0.35, 95% CI 0.16, 0.76, and OR = 0.39, 95% CI 0.15, 1.00, respectively). Similarly, infants in households that boiled or filtered water had significantly lower odds of diarrhea compared to households that did not treat water (OR = 0.40, 95% CI 0.19, 0.86 and OR = 0.23, 95% CI 0.06, 0.84, respectively). Integrating multiscalar data better informs the health impacts of water in urban settings.
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Affiliation(s)
- Leon M. Espira
- Department
of Epidemiology, University of Michigan
School of Public Health, Ann Arbor, Michigan 48109, United States
| | - Brook Gessese
- Ethiopian
Institute of Water Resources, Addis Ababa
University, Addis
Ababa 150461, Ethiopia
| | - Bayable A. Kassa
- Institute
of Biotechnology, Addis Ababa University, Addis Ababa 1176, Ethiopia
| | - Chia-Chen Wu
- Institute
of Environmental Engineering, National Yang
Ming Chiao Tung University, Hsinchu City 30010, Taiwan
| | - Joshua Riley
- Department
of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Seifedin Bedru
- School of
Civil and Environmental Engineering, Addis
Ababa University, Addis Ababa 1176, Ethiopia
| | - Geremew Sahilu
- School of
Civil and Environmental Engineering, Addis
Ababa University, Addis Ababa 1176, Ethiopia
| | - Adey Desta
- Department
of Microbial and Cellular Biology, Addis
Ababa University, Addis Ababa 1176, Ethiopia
| | - Kaleab Baye
- Center
for
Food Science and Nutrition, College of Natural and Computational Sciences, Addis Ababa University, Addis Ababa 1176, Ethiopia
| | - Andrew D. Jones
- Department
of Nutritional Sciences, University of Michigan
School of Public Health, Ann Arbor, Michigan 48109, United States
| | - Nancy G. Love
- Department
of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Joseph N. S. Eisenberg
- Department
of Epidemiology, University of Michigan
School of Public Health, Ann Arbor, Michigan 48109, United States
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9
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Liu S, Li Q, Jiang R, Liu P, Zhang XX. Shift of human pathogen community composition and their potential human health risk after supply suspension in tap water. Sci Rep 2023; 13:12419. [PMID: 37528119 PMCID: PMC10393962 DOI: 10.1038/s41598-023-39225-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 07/21/2023] [Indexed: 08/03/2023] Open
Abstract
Water supply suspension-restoration can occur frequently due to the overhauling of civil infrastructure in developing countries and the shutdown of commercial buildings during the pandemic. For comprehensive insights into the effects of water supply suspension-restoration, this study characterized the variations of the pathogen community composition of the tap water and their infection risk under different water supply scenarios. Metagenomic sequencing revealed a significant change of the human pathogen profiles, among which the most dominant pathogen changed from Pseudomonas aeruginosa (4.91%) to Acinetobacter johnsonii (0.59%). Furthermore, absolute quantification of pathogens by propidium-monoazide-qPCR revealed that the abundance of the three typical pathogens (Pseudomonas aeruginosa, Mycobacterium avium and Salmonella sp.) showed an increase of 2.44 log to 3.60 log immediately after water supply suspension-restoration and did not return to the normal level even after 2-h supply restoration, except for Pseudomonas aeruginosa. Quantitative microbial risk assessment suggested the infection risks of the three pathogens arising from direct utilization of tap water under stable water supply, including dermal exposure and oral intake, were all above the threshold of 10-4, and evidently increased after water supply suspension-restoration. This study warns us against the risk induced by the pathogens in tap water, especially after water supply suspension-restoration.
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Affiliation(s)
- Shengnan Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China
| | - Qisheng Li
- China Three Gorges Construction Engineering Corporation, Beijing, 100048, China
| | - Ruiming Jiang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China
| | - Peng Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China.
| | - Xu-Xiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Road, Nanjing, 210023, China.
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10
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Falcone M, Salvinelli C, Bah M, Thomas E. Effectiveness of a water-vending kiosk intervention toward household water quality and surveyed water security in Freetown, Sierra Leone. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 875:162447. [PMID: 36898533 DOI: 10.1016/j.scitotenv.2023.162447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/19/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Low-income urban residents of Freetown, Sierra Leone, have limited access to safely managed piped drinking water services. The Government of Sierra Leone, in partnership with the United States Millennium Challenge Corporation, implemented a demonstration project of ten water kiosks providing distributed, stored, treated water among two neighborhoods in Freetown. This study quantifies the impact of the water kiosk intervention by utilizing a quasi-experimental propensity score matched difference-in-differences study design. Results indicate a 0.6 % improvement in household microbial water quality and an 8.2 % improvement in surveyed water security within the treatment group. Furthermore, low functionality and adoption of the water kiosks were observed.
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Affiliation(s)
- Matthew Falcone
- Mortenson Center in Global Engineering and Resilience, University of Colorado Boulder, Boulder, CO, USA
| | - Carlo Salvinelli
- Mortenson Center in Global Engineering and Resilience, University of Colorado Boulder, Boulder, CO, USA
| | - Mohamed Bah
- Ministry of Water Resources, Freetown, Sierra Leone
| | - Evan Thomas
- Mortenson Center in Global Engineering and Resilience, University of Colorado Boulder, Boulder, CO, USA.
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11
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Capone D, Bivins A, Brown J. Producing ratio measures of effect with quantitative microbial risk assessment. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 2023. [PMID: 35689350 DOI: 10.17605/osf.io/jwzy9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Estimating the risk of infections or other outcomes incident to pathogen exposure is a primary goal of quantitative microbial risk assessment (QMRA). Such estimates are useful to predict population-level risks, to evaluate exposures based on normative or tolerable risk guidelines, and to interpret the likely public health relevance of microbial measurements in environmental media. To evaluate alternative control measures (interventions), ratio estimates of effect (e.g., odds and risk ratios) are needed that are more broadly interpretable in the health sciences and consistent with convention in epidemiology. In this paper, we propose a general method for estimating widely used ratio measures of effect derived from stochastic QMRA approaches, including the generation of appropriate confidence intervals. Such QMRA-derived ratios can be used as a basis for evaluating interventions via hypothesis testing and for inclusion in systematic reviews and meta-analyses in a form consistent with risk estimation approaches commonly used in epidemiology.
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Affiliation(s)
- Drew Capone
- Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Aaron Bivins
- Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, Louisiana, USA
| | - Joe Brown
- Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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12
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Capone D, Bivins A, Brown J. Producing ratio measures of effect with quantitative microbial risk assessment. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 2023; 43:917-927. [PMID: 35689350 PMCID: PMC9734285 DOI: 10.1111/risa.13972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 05/12/2022] [Accepted: 05/12/2022] [Indexed: 05/06/2023]
Abstract
Estimating the risk of infections or other outcomes incident to pathogen exposure is a primary goal of quantitative microbial risk assessment (QMRA). Such estimates are useful to predict population-level risks, to evaluate exposures based on normative or tolerable risk guidelines, and to interpret the likely public health relevance of microbial measurements in environmental media. To evaluate alternative control measures (interventions), ratio estimates of effect (e.g., odds and risk ratios) are needed that are more broadly interpretable in the health sciences and consistent with convention in epidemiology. In this paper, we propose a general method for estimating widely used ratio measures of effect derived from stochastic QMRA approaches, including the generation of appropriate confidence intervals. Such QMRA-derived ratios can be used as a basis for evaluating interventions via hypothesis testing and for inclusion in systematic reviews and meta-analyses in a form consistent with risk estimation approaches commonly used in epidemiology.
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Affiliation(s)
- Drew Capone
- University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Aaron Bivins
- Louisiana State University, Baton Rouge, Louisiana, USA
| | - Joe Brown
- University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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13
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Angnunavuri PN, Attiogbe F, Mensah B. Microbial contamination and quantitative microbial risk assessment of high-density polyethylene (HDPE) film sachet drinking water in Ghana. JOURNAL OF WATER AND HEALTH 2022; 20:1587-1603. [PMID: 36308501 DOI: 10.2166/wh.2022.163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The present research estimated the impact of storage on the microbial quality of high-density polyethylene drinking water. Samples were taken from two popular companies in Greater Accra using a two-sided exact test in SAS JMP to estimate the sample size. The samples were stored across three temperature profiles at 8 °C, 30 °C (average room temperature), and 40 °C (average outdoor temperature) for 28 days. The samples were examined using standard microbiological methods for heterotrophic plate counts (HPCs), faecal coliforms, and Escherichia coli. The data were described and regressed with Microsoft Excel, Argo 4.3.1, and SAS JMP software. The results demonstrated increasing deterioration of the water samples for all microbial indices at all temperatures with increasing storage duration. The highest HPC, faecal coliforms, and E. coli were 1,312; 622; and 252 cfu/100 mL, respectively, all at 40 °C. The daily risk of infection due to E. coli O157:H7 was 5.22 × 10-5 infections per child per day for children under 5 years, and 1.6 × 10-4 attacks per adult per day, compared to the upper limit of 1.0 × 10-6. These results are higher than recommended exposures, and interventions along the sachet drinking water value chain are needed to protect public health.
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Affiliation(s)
- Prosper Naah Angnunavuri
- School of Engineering, Department of Civil and Environmental Engineering, University of Energy and Natural Resources, Sunyani, Ghana E-mail:
| | - Francis Attiogbe
- School of Engineering, Department of Civil and Environmental Engineering, University of Energy and Natural Resources, Sunyani, Ghana E-mail:
| | - Bismark Mensah
- School of Engineering, University of Ghana, Legon, Ghana
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14
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Latchmore T, Hynds PD, Stephen Brown R, McDermott K, Majury A. Estimating the duration and overlap of Escherichia coli contamination events in private groundwater supplies for quantitative risk assessment using a multiannual (2010-2017) provincial dataset. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 309:119784. [PMID: 35843457 DOI: 10.1016/j.envpol.2022.119784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 07/08/2022] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
Approximately 1.6 million individuals in Ontario rely on private water wells. Private well water quality in Ontario remains the responsibility of the well owner, and due to the absence of regulation, quantitative microbial risk assessment (QMRA) likely represents the most effective approach to estimating and mitigating waterborne infection risk(s) from these supplies. Annual contamination duration (i.e., contaminated days per annum) represents a central input for waterborne QMRA; however, it is typically based on laboratory studies or meta-analyses, thus representing an important limitation for risk assessment, as groundwater mesocosms cannot accurately replicate subsurface conditions. The present study sought to address these limitations using a large spatio-temporal in-situ groundwater quality dataset (>700,000 samples) to evaluate aquifer-specific E. coli die-off rates (CFU/100 mL per day decline), subsequent contamination sequence duration(s) and the likelihood of overlapping contamination events. Findings indicate median E. coli die-off rates of 0.38 CFU/100 mL per day and 0.64 CFU/100 mL per day, for private wells located in unconsolidated and consolidated aquifers, respectlvely, with mean calculated contamination sequence durations of 18 days (unconsolidated) and 11 days (consolidated). Study findings support and permit development of increasingly evidence-based, regionally- and temporally-specific quantitative waterborne risk assessment.
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Affiliation(s)
- Tessa Latchmore
- School of Environmental Studies, Queen's University, 99 University Avenue, Kingston, Ontario, Canada
| | - Paul D Hynds
- Technological University Dublin, Park House, 191 N Circular Rd, Dublin, Ireland.
| | - R Stephen Brown
- School of Environmental Studies, Queen's University, 99 University Avenue, Kingston, Ontario, Canada
| | - Kevin McDermott
- Public Health Ontario, 181 Barrie Street, Kingston, Ontario, Canada
| | - Anna Majury
- School of Environmental Studies, Queen's University, 99 University Avenue, Kingston, Ontario, Canada; Public Health Ontario, 181 Barrie Street, Kingston, Ontario, Canada
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15
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Lindmark M, Cherukumilli K, Crider YS, Marcenac P, Lozier M, Voth-Gaeddert L, Lantagne DS, Mihelcic JR, Zhang QM, Just C, Pickering AJ. Passive In-Line Chlorination for Drinking Water Disinfection: A Critical Review. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:9164-9181. [PMID: 35700262 PMCID: PMC9261193 DOI: 10.1021/acs.est.1c08580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 05/26/2022] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
The world is not on track to meet Sustainable Development Goal 6.1 to provide universal access to safely managed drinking water by 2030. Removal of priority microbial contaminants by disinfection is one aspect of ensuring water is safely managed. Passive chlorination (also called in-line chlorination) represents one approach to disinfecting drinking water before or at the point of collection (POC), without requiring daily user input or electricity. In contrast to manual household chlorination methods typically implemented at the point of use (POU), passive chlorinators can reduce the user burden for chlorine dosing and enable treatment at scales ranging from communities to small municipalities. In this review, we synthesized evidence from 27 evaluations of passive chlorinators (in 19 articles, 3 NGO reports, and 5 theses) conducted across 16 countries in communities, schools, health care facilities, and refugee camps. Of the 27 passive chlorinators we identified, the majority (22/27) were solid tablet or granular chlorine dosers, and the remaining devices were liquid chlorine dosers. We identified the following research priorities to address existing barriers to scaled deployment of passive chlorinators: (i) strengthening local chlorine supply chains through decentralized liquid chlorine production, (ii) validating context-specific business models and financial sustainability, (iii) leveraging remote monitoring and sensing tools to monitor real-time chlorine levels and potential system failures, and (iv) designing handpump-compatible passive chlorinators to serve the many communities reliant on handpumps as a primary drinking water source. We also propose a set of reporting indicators for future studies to facilitate standardized evaluations of the technical performance and financial sustainability of passive chlorinators. In addition, we discuss the limitations of chlorine-based disinfection and recognize the importance of addressing chemical contamination in drinking water supplies. Passive chlorinators deployed and managed at-scale have the potential to elevate the quality of existing accessible and available water services to meet "safely managed" requirements.
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Affiliation(s)
- Megan Lindmark
- Department
of Civil and Environmental Engineering, University of Iowa, Iowa City, Iowa 52242-1396, United States
| | - Katya Cherukumilli
- Department
of Civil and Environmental Engineering, University of California Berkeley, Berkeley, California 94720-2284, United States
| | - Yoshika S. Crider
- Energy
& Resources Group, University of California
Berkeley, Berkeley, California 94720-2284, United States
- Division
of Epidemiology & Biostatistics, University
of California Berkeley, Berkeley, California 94720-2284, United States
- King
Center on Global Development, Stanford University, Stanford, California 94305-2004, United States
| | - Perrine Marcenac
- National
Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30329, United States
| | - Matthew Lozier
- National
Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30329, United States
| | - Lee Voth-Gaeddert
- National
Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30329, United States
- SAMRC/WITS
Developmental Pathways for Health Research Unit, University of the Witwatersrand, Johannesburg, 2050, South Africa
| | - Daniele S. Lantagne
- Tufts
University School of Engineering, Medford, Massachusetts 02155-1012, United States
| | - James R. Mihelcic
- Department
of Civil and Environmental Engineering, University of South Florida, Tampa, Florida 33620-5350, United States
| | - Qianjin Marina Zhang
- Lichtenberger
Engineering Library, University of Iowa, Iowa City, Iowa 52242-1396, United States
| | - Craig Just
- Department
of Civil and Environmental Engineering, University of Iowa, Iowa City, Iowa 52242-1396, United States
| | - Amy J. Pickering
- Department
of Civil and Environmental Engineering, University of California Berkeley, Berkeley, California 94720-2284, United States
- Blum
Center for Developing Economies, University
of California Berkeley, Berkeley, California 94720-2284, United States
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16
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Rocha-Melogno L, Crank KC, Ginn O, Bergin MH, Brown J, Gray GC, Hamilton KA, Bibby K, Deshusses MA. Quantitative microbial risk assessment of outdoor aerosolized pathogens in cities with poor sanitation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 827:154233. [PMID: 35245543 DOI: 10.1016/j.scitotenv.2022.154233] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 02/08/2022] [Accepted: 02/25/2022] [Indexed: 06/14/2023]
Abstract
The aeromicrobiological transmission pathway of enteric pathogens in places with unsafe sanitation services is poorly understood. In an attempt to partly fill this knowledge gap, we assessed the potential public health impact of bioaerosols near open waste canals (OWCs) using Quantitative Microbial Risk Assessment (QMRA). We used data acquired in La Paz, Bolivia to characterize the risk of disease that aerosolized enteric pathogens may pose through food, fomites and inhalation (all followed by ingestion). Three reference pathogens were selected to conduct the assessment: enterotoxigenic Escherichia coli (ETEC), Shigella flexneri, and Campylobacter jejuni. Inhalation followed by ingestion had the highest median infection risk per event i.e. 3 × 10-5 (3 infections for every 100,000 exposures), compared to contaminated food e.g. 5 × 10-6 and fomites e.g. 2 × 10-7, all for C. jejuni infections. Our sensitivity analysis showed that bacterial fluxes from the air were the most influential factor on risk. Our results suggest that fecal bacterial aerosols from OWCs present non-negligible risks of infection in La Paz, with median annual infection risks by C. jejuni being 18 (food), and 100 (inhalation) times greater than the EPA's standard for drinking water (1 × 10-4). We included two of the QMRA models presented here in a novel web application we developed for user-specified application in different contexts.
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Affiliation(s)
- Lucas Rocha-Melogno
- Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708, United States; Duke Global Health Institute, Duke University, Durham, NC 27710, United States; ICF, 2635 Meridian Parkway Suite 200, Durham, NC 27713, United States
| | - Katherine C Crank
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, IN 46556, United States
| | - Olivia Ginn
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States
| | - Michael H Bergin
- Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708, United States
| | - Joe Brown
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599, United States
| | - Gregory C Gray
- Duke Global Health Institute, Duke University, Durham, NC 27710, United States; Division of Infectious Diseases, Duke University School of Medicine, Durham, NC 27710, United States; Global Health Research Center, Duke-Kunshan University, Kunshan, China; Emerging Infectious Diseases Program, Duke-NUS Medical School, Singapore, Singapore; Division of Infectious Diseases, University of Texas Medical Branch (UTMB), Galveston, TX 77555, United States
| | - Kerry A Hamilton
- School of Sustainable Engineering and the Built Environment, Arizona State University, 770 S College Ave, Tempe, AZ 85281, United States; The Biodesign Institute Center for Environmental Health Engineering, Arizona State University, 1001 S McAllister Ave, Tempe, AZ 85281, United States
| | - Kyle Bibby
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, IN 46556, United States
| | - Marc A Deshusses
- Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708, United States; Duke Global Health Institute, Duke University, Durham, NC 27710, United States.
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17
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Spatial heterogeneity of neighborhood-level water and sanitation access in informal urban settlements: A cross-sectional case study in Beira, Mozambique. PLOS WATER 2022; 1. [PMID: 36258753 PMCID: PMC9573900 DOI: 10.1371/journal.pwat.0000022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Rapid urbanization, resulting in population growth within informal settlements, has worsened exclusion and inequality in access to water and sanitation (WASH) services in the poorest and most marginalized communities. In this study, we describe the heterogeneity in water service satisfaction and WASH access in low-income, peri-urban neighborhoods of Beira, Mozambique, and examine whether this heterogeneity can be explained by distance to water distribution mains. Using spatial statistics and regression analyses, we identify spatial heterogeneity in household WASH access, as well as consumer-reported satisfaction with water services (services, pressure, quality, and sufficient quantity). We find that as distance from the water main increased, both access to an improved water source at the household and satisfaction with water pressure decreases, and water supply intermittency increases, controlling for household density and socioeconomic status. The odds of a household having access to a water source at the household or on the compound decreases with every 100-meter increase in distance from a water main pipe (odds ratio [OR] 0.87, 95% confidence interval [CI]: 0.82, 0.92). Satisfaction with water services also decreases with every 100-meter increase in distance from a water main pipe (OR: 0.80; 95% CI: 0.69, 0.94). Days of availability in the past week decreases by a factor of 0.22 for every 100-meter increase in distance from the water main (95% CI: −0.29, −0.15). Findings from this study highlight the unequal household access to water and sanitation in urban informal settlements, even within low-income neighborhoods. Describing this heterogeneity of access to water services, sanitation, and satisfaction—and the factors influencing them—can inform stakeholders and guide the development of infrastructural solutions to reduce water access inequities within urban settings.
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18
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Daly SW, Harris AR. Modeling Exposure to Fecal Contamination in Drinking Water due to Multiple Water Source Use. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:3419-3429. [PMID: 35239319 PMCID: PMC8928470 DOI: 10.1021/acs.est.1c05683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 06/01/2023]
Abstract
The Joint Monitoring Programme estimated that 71% of people globally had access to "safely managed" drinking water in 2017. However, typical data collection practices focus only on a household's primary water source, yet some households in low- and middle-income countries (LMICs) engage in multiple water source use, including supplementing improved water supplies with unimproved water throughout the year. Monte Carlo simulations and previously published data were used to simulate exposure to fecal contamination (as measured by E. coli) along a range of supplemental unimproved source use rates (e.g., 0-100% improved water use, with the remainder made up with unimproved water). The model results revealed a statistically significant increase in annual exposure to E. coli when individuals supplement their improved water with unimproved water just 2 days annually. Additionally, our analysis identified scenarios-realistic for the data set study setting-where supplementing with unimproved water counterintuitively decreases exposure to E. coli. These results highlight the need for evaluating the temporal dynamics in water quality and availability of drinking water sources in LMICs as well as capturing the use of multiple water sources for monitoring global access to safe drinking water.
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19
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Nijhawan A, Howard G. Associations between climate variables and water quality in low- and middle-income countries: A scoping review. WATER RESEARCH 2022; 210:117996. [PMID: 34959067 DOI: 10.1016/j.watres.2021.117996] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 11/15/2021] [Accepted: 12/18/2021] [Indexed: 06/14/2023]
Abstract
Understanding how climate change will affect water quality and therefore, health, is critical for building resilient water services in low- and middle-income countries (LMICs) where the effect of climate change will be felt most acutely. Evidence of the effect of climate variables such as temperate and rainfall on water quality can generate insights into the likely impact of future climate change. While the seasonal effects on water quality are known, and there is strong qualitative evidence that climate change will impact water quality, there are no reviews that synthesise quantitative evidence from LMICs on links between climate variables and water quality. We mapped the available evidence on a range of climate exposures and water quality outcomes and identified 98 peer-reviewed studies. This included observational studies on the impact of temperature and rainfall events (which may cause short-term changes in contaminant concentrations), and modelling studies on the long-term impacts of sea level rise. Evidence on links between antecedent rainfall and microbiological contamination of water supplies is strong and relatively evenly distributed geographically, but largely focused on faecal indicator bacteria and on untreated shallow groundwater sources of drinking water. The literature on climate effects on geogenic contaminants was sparse. There is substantial research on the links between water temperature and cyanobacteria blooms in surface waters, although most studies were from two countries and did not examine potential effects on water treatment. Similarly, studies modelling the impact of sea level rise on groundwater salinity, mostly from south-Asia and the Middle East, did not discuss challenges for drinking water supplies. We identified key future research priorities based on this review. These include: more studies on specific pathogens (including opportunistic pathogens) in water supplies and their relationships with climate variables; more studies that assess likely relationships between climate variables and water treatment processes; studies into the relationships between climate variables and geogenic contaminants, including risks from heavy metals released as glacier retreat; and, research into the impacts of wildfires on water quality in LMICs given the current dearth of studies but recognised importance.
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Affiliation(s)
- Anisha Nijhawan
- Department of Civil Engineering and Cabot Institute for the Environment, University of Bristol, Bristol, BS8 1TR, UK.
| | - Guy Howard
- Department of Civil Engineering and Cabot Institute for the Environment, University of Bristol, Bristol, BS8 1TR, UK.
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20
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Wang Z, Yang W, Hua P, Zhang J, Krebs P. Transmission risk of SARS-CoV-2 in the watershed triggered by domestic wastewater discharge. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150888. [PMID: 34634348 PMCID: PMC8501193 DOI: 10.1016/j.scitotenv.2021.150888] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 10/04/2021] [Accepted: 10/05/2021] [Indexed: 05/23/2023]
Abstract
The outbreak of COVID-19, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has already become an unprecedented global pandemic. However, the transmission of SARS-CoV-2, especially the protected SARS-CoV-2 RNA (pRNA) with infectious particles in waterways, is still largely unexplored. In this study, we developed a model to estimate SARS-CoV-2 transmission from the risk source in the excretion of patients to the final exposure in surface water. The model simulated the spatial and temporal distribution of the viral pRNA concentrations in the surface water of the Elbe watershed from March 2020 to January 2021. The results show that the WWTPs with the maximum capacity of >10,000 population equivalents were responsible for 95% of the viral load discharged into the surface water. We estimated the pRNA concentrations in surface water to be 1.33 × 10-2 copies·L-1 on average in the watershed based on the model simulation on viral transmission. It had considerable variations in spatial and temporal scales, which are dominantly controlled by epidemic situations and virus transport with decay in water, respectively. A quantitative microbial risk assessment was conducted to estimate the viral infection probability from surface water ingestion with consideration of the influence of toilet usage frequency and gender/age population groups. All the infection probabilities in the study period were lower than the reference risk levels of 10-4 and 10-5. The individuals aged 15-34 years had the highest infection probability of 4.86 × 10-9 on average from surface water ingestion during swimming activities. The data provided herein suggest that the low pRNA concentrations and infection probability reflected that the waterways were unlikely to be a significant transmission route for SARS-CoV-2.
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Affiliation(s)
- Zhenyu Wang
- Institute of Urban and Industrial Water Management, Technische Universität Dresden, 01062 Dresden, Germany
| | - Wenyu Yang
- Institute of Urban and Industrial Water Management, Technische Universität Dresden, 01062 Dresden, Germany
| | - Pei Hua
- SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, China; School of Environment, South China Normal University, University Town, Guangzhou, China.
| | - Jin Zhang
- Department of Ecology and Institute of Hydrobiology, Jinan University, 510632 Guangzhou, China
| | - Peter Krebs
- Institute of Urban and Industrial Water Management, Technische Universität Dresden, 01062 Dresden, Germany
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21
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Salehi M. Global water shortage and potable water safety; Today's concern and tomorrow's crisis. ENVIRONMENT INTERNATIONAL 2022; 158:106936. [PMID: 34655888 DOI: 10.1016/j.envint.2021.106936] [Citation(s) in RCA: 76] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/10/2021] [Accepted: 10/11/2021] [Indexed: 05/28/2023]
Abstract
Climate change, severe droughts, population growth, demand increase, and poor management during the recent decades have further stressed the scarce freshwater resources worldwide and resulted in severe water shortages in many regions. The water utilities address the water shortage by providing alternative source of water, augment the supplied water, supply intermittently, and even bulk water delivery under severe water shortage conditions. On the other hand, many households store water in building storage tanks to cope with insufficient delivery of potable water due to frequent interruptions. All these practices could pose crucial risks to the chemical and microbiological quality of the water. However, consistent monitoring and implementation of mitigation strategies could lower the potential risks associated with these practices. It is critical to identify the potential hazards resulting from the alternative water supplies and distribution practices to develop temporary and long-term monitoring and mitigation plans and reduce the microbial and chemical contamination of potable water delivered to the consumers. This paper provides a holistic review of the significant hazards associated with the practices employed by the water utilities and water consumers to alleviate the potable water shortage and discusses the required monitoring and mitigation practices.
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Affiliation(s)
- Maryam Salehi
- Department of Civil Engineering, The University of Memphis, 3815 Central Avenue, 108C Engineering Science Bldg, Memphis, TN 38152, United States.
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22
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Smith DW, Islam M, Furst KE, Mustaree S, Crider YS, Akter N, Islam SA, Sultana S, Mahmud ZH, Rahman M, Mitch WA, Davis J. Chlorine taste can increase simulated exposure to both fecal contamination and disinfection byproducts in water supplies. WATER RESEARCH 2021; 207:117806. [PMID: 34768105 DOI: 10.1016/j.watres.2021.117806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 08/21/2021] [Accepted: 10/21/2021] [Indexed: 06/13/2023]
Abstract
Expanding drinking water chlorination could substantially reduce the burden of disease in low- and middle-income countries, but the taste of chlorinated water often impedes adoption. We developed a Monte Carlo simulation to estimate the effect of people's choice to accept or reject drinking water based on chlorine taste and their subsequent exposure to E. coli and trihalomethanes, a class of disinfection byproduct (DBP). The simulation used empirical data from Dhaka, Bangladesh, a megacity with endemic waterborne disease. We drew on published taste acceptability thresholds from Dhaka residents, measured residual chlorine and thermotolerant E. coli inactivation following the addition of six chlorine doses (0.25-3.0 mg/L as Cl2) to untreated piped water samples from 100 locations, and analyzed trihalomethane formation in 54 samples. A dose of 0.5 mg/L, 75% lower than the 2 mg/L dose typically recommended for household chlorination of low-turbidity waters, minimized overall exposure to E. coli. Doses of 1-2 mg/L maximized overall exposure to trihalomethanes. Accounting for chlorine taste aversion indicates that microbiological exposure increases and DBP exposure decreases above certain doses as a higher proportion of people reject chlorinated water in favor of untreated water. Taken together with findings from other modeling analyses, empirical studies, and field trials, our results suggest that taste acceptability should be a critical consideration in establishing chlorination dosing guidelines. Particularly when chlorination is first implemented in water supplies with low chlorine demand, lower doses than those generally recommended for household water treatment can help avoid taste-related objections while still meaningfully reducing contaminant exposure.
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Affiliation(s)
- Daniel W Smith
- Civil & Environmental Engineering, Stanford University, 473 Via Ortega, Y2E2 Building, Stanford, CA 94305, USA.
| | - Mahfuza Islam
- Environmental Interventions Unit, International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh
| | - Kirin E Furst
- Civil & Environmental Engineering, Stanford University, 473 Via Ortega, Y2E2 Building, Stanford, CA 94305, USA
| | - Shobnom Mustaree
- Environmental Microbiology Laboratory, icddr,b, 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh
| | - Yoshika S Crider
- Energy & Resources Group and Division of Epidemiology & Biostatistics, University of California Berkeley, 310 Barrows Hall, Berkeley, CA 94720, USA
| | - Nazrin Akter
- Environmental Interventions Unit, International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh
| | - Syed Anjerul Islam
- Environmental Interventions Unit, International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh
| | - Sonia Sultana
- Environmental Interventions Unit, International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh
| | - Zahid H Mahmud
- Environmental Microbiology Laboratory, icddr,b, 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh
| | - Mahbubur Rahman
- Environmental Interventions Unit, International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), 68 Shaheed Tajuddin Ahmed Sarani, Mohakhali, Dhaka 1212, Bangladesh
| | - William A Mitch
- Civil & Environmental Engineering, Stanford University, 473 Via Ortega, Y2E2 Building, Stanford, CA 94305, USA
| | - Jennifer Davis
- Civil & Environmental Engineering, Stanford University, 473 Via Ortega, Y2E2 Building, Stanford, CA 94305, USA; Stanford Woods Institute for the Environment, Stanford University, 473 Via Ortega, Y2E2 Building, Stanford, CA 94305, USA
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23
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Nwabuife JC, Pant AM, Govender T. Liposomal delivery systems and their applications against Staphylococcus aureus and Methicillin-resistant Staphylococcus aureus. Adv Drug Deliv Rev 2021; 178:113861. [PMID: 34242712 DOI: 10.1016/j.addr.2021.113861] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 06/29/2021] [Accepted: 07/01/2021] [Indexed: 12/16/2022]
Abstract
Liposomal delivery systems have been widely explored for targeting superbugs such as S. aureus and MRSA, overcoming antimicrobial resistance associated with conventional dosage forms. They have the significant advantage of delivering hydrophilic and lipophilic antimicrobial agents, either singularly as monotherapy or in combination as combination therapy, due to their bilayers with action-site-specificity, resulting in improved targeting compared to conventional dosage forms. Herein, we present an extensive and critical review of the different liposomal delivery systems employed in the past two decades for the delivery of both antibiotics of different classes and non-antibiotic antibacterial agents, as monotherapy and combination therapy to eradicate infections caused by S. aureus and MRSA. The review also identifies future research and strategies potentiating the applications of liposomal delivery systems against S. aureus and MRSA. This review confirms the potential application of liposomal delivery systems for effective delivery and specific targeting of S. aureus and MRSA infections.
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24
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Bolatova Z, Tussupova K, Toleubekov B, Sukhanberdiyev K, Sharapatova K, Stafström M. Challenges of Access to WASH in Schools in Low- and Middle-Income Countries: Case Study from Rural Central Kazakhstan. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18189652. [PMID: 34574575 PMCID: PMC8472705 DOI: 10.3390/ijerph18189652] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/06/2021] [Accepted: 09/08/2021] [Indexed: 11/17/2022]
Abstract
Safe water and sanitation, which give rise to appropriate hygiene, are fundamental determinants of individual and social health and well-being. Thereby, assessing and widening access to sustainable, durable water and sanitation infrastructure remains a global health issue. Rural areas are already at a disadvantage. Poor access to water, sanitation, and hygiene (WASH) can have a major negative effect on students in rural schools. Thus, the paper aims to assess the current condition and the challenge to access WASH in rural Kazakh schools. The study was conducted in three rural schools in Central Kazakhstan. Data were gathered through a survey among pupils, observations of the WASH infrastructure and maintenance, and a face-to-face interview with school administrators. The mean survey response rate was 65% across schools. Results indicated there was no alternative drinking-water source in schools, and 15% of students said they had access to water only occasionally. Half of the students reported that the water was unsafe to drink because of a poor odor, taste, or color. The toilet in school 3 was locked with a key, and a quarter of the students reported there was no access to a key. Moreover, not having gender-separated toilet facilities was a challenge because of the traditional gender norms. Despite the effective regulations and measures of handwashing taken during COVID-19, 27.7% of the students answered that soap was not offered daily in classrooms. Additionally, warm water was only provided in school 2. About 75% of students did not have access to drying materials continuously. The study shows that having the schools’ infrastructure is not enough when characteristics, such as availability, accessibility, maintenance, operation, quality of services, education, and practices, are ignored. Cooperation between local education authorities, school administration, and parents should be encouraged to the achievement of the sustainable development goals (SDGs) by 2030.
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Affiliation(s)
- Zhanerke Bolatova
- School of Public Health, Biomedicine and Pharmacy, Karaganda Medical University, Karaganda 100008, Kazakhstan; (Z.B.); (B.T.)
| | - Kamshat Tussupova
- Division of Water Resources Engineering, Lund University, SE-22100 Lund, Sweden
- Kazakh National Agrarian University, Almaty 050010, Kazakhstan
- Correspondence:
| | - Berik Toleubekov
- School of Public Health, Biomedicine and Pharmacy, Karaganda Medical University, Karaganda 100008, Kazakhstan; (Z.B.); (B.T.)
- Department of Clinical Sciences, Lund University, SE-22100 Lund, Sweden;
| | | | - Kulyash Sharapatova
- Department of Surgery and Gynecology and Pediatry, Pavlodar Branch, Semey State Medical University, Pavlodar 140000, Kazakhstan;
| | - Martin Stafström
- Department of Clinical Sciences, Lund University, SE-22100 Lund, Sweden;
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25
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Calero Preciado C, Husband S, Boxall J, Del Olmo G, Soria-Carrasco V, Maeng SK, Douterelo I. Intermittent Water Supply Impacts on Distribution System Biofilms and Water Quality. WATER RESEARCH 2021; 201:117372. [PMID: 34198200 DOI: 10.1016/j.watres.2021.117372] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/08/2021] [Accepted: 06/14/2021] [Indexed: 06/13/2023]
Abstract
Intermittent water supplies (IWS) are routinely experienced by drinking water distribution systems around the world, either due to ongoing operational practices or due to one off interruptions. During IWS events changing conditions may impact the endemic biofilms leading to hydraulic mobilisation of organic and inorganic materials attached to pipes walls with a resulting degradation in water quality. To study the impact of IWS on the microbiological and physico-chemical characteristics of drinking water, an experimental full-scale chlorinated pipe facility was operated over 60 days under realistic hydraulic conditions to allow for biofilm growth and to investigate flow resumption behaviour post-IWS events of 6, 48 and 144 hours. Turbidity and metal concentrations showed significant responses to flow restarting, indicating biofilm changes, with events greater than 6 hours generating more turbidity responses and hence discolouration risk. The increase in pressure when the system was restarted showed a substantial increase in total cell counts, while the subsequent increases in flow led to elevated turbidity and metals concentrations. SUVA254 monitoring indicated that shorter times of non-water supply increased the risk of aromatic organic compounds and hence risk of disinfection-by-products formation. DNA sequencing indicated that increasing IWS times resulted in increased relative abundance of potential pathogenic microorganisms, such as Mycobacterium, Sphingomonas, and the fungi Penicillium and Cladosporium. Overall findings indicate that shorter IWS result in a higher proportion of aromatic organic compounds, which can potentially react with chlorine and increase risk of disinfection-by-products formation. However, by minimising IWS times, biofilm-associated impacts can be reduced, yet these are complex ecosystems and much remains to be understood about how microbial interactions can be managed to best ensure continued water safe supply.
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Affiliation(s)
- Carolina Calero Preciado
- Department of Civil and Structural Engineering, Mappin Street, University of Sheffield, Sheffield S1 3JD, UK.; Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK..
| | - Stewart Husband
- Department of Civil and Structural Engineering, Mappin Street, University of Sheffield, Sheffield S1 3JD, UK
| | - Joby Boxall
- Department of Civil and Structural Engineering, Mappin Street, University of Sheffield, Sheffield S1 3JD, UK
| | - Gonzalo Del Olmo
- Department of Civil and Structural Engineering, Mappin Street, University of Sheffield, Sheffield S1 3JD, UK
| | - Víctor Soria-Carrasco
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - Sung Kyu Maeng
- Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul 143-747, Republic of Korea
| | - Isabel Douterelo
- Department of Civil and Structural Engineering, Mappin Street, University of Sheffield, Sheffield S1 3JD, UK
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26
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Meyer DD, Khari J, Whittle AJ, Slocum AH. Effects of hydraulically disconnecting consumer pumps in an intermittent water supply. WATER RESEARCH X 2021; 12:100107. [PMID: 34345814 PMCID: PMC8319575 DOI: 10.1016/j.wroa.2021.100107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 06/12/2021] [Accepted: 06/14/2021] [Indexed: 06/13/2023]
Abstract
We estimate 250 million people receive water using private pumps connected directly to intermittently pressurized distribution networks. Yet no previous studies have quantified the presumed effects of these pumps. In this paper, we investigate the effects of installing pressure-sustaining valves at consumer connections. These valves mimic pump disconnection by restricting flow. Installing these valves during the dry season at 94% of connections in an affluent neighborhood in Delhi, India, cut the prevalence of samples with turbidity > 4 NTU by two thirds. But considering the poor reputation of pumps, installed valves had surprisingly small average effects on turbidity (-8%; p<0.01) and free chlorine (+0.05 mg/L; p<0.001; N = 1,031). These effects were much smaller than the high variability in water quality supplied to both control and valve-installed neighborhoods. Site-specific responses to this variability could have confounded our results. At the study site, installed valves increased network pressure during 88% of the typical supply window; valves had a maximum pressure effect of +0.62 m (95% CI [0.54, 0.71]; a 40% increase vs. control). Further research is needed to generalize beyond our study site. Nevertheless, this paper provides unique evidence showing how the deployed valves mitigated pump effects, increased network pressure and improved water safety.
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Affiliation(s)
- David D.J. Meyer
- Mechanical Engineering, MIT, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
| | - J. Khari
- Anonymous Partner Utility, Delhi, India
| | - Andrew J. Whittle
- Civil and Environmental Engineering, MIT, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
| | - Alexander H. Slocum
- Mechanical Engineering, MIT, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
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27
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Bivins A, Lowry S, Wankhede S, Hajare R, Murphy HM, Borchardt M, Labhasetwar P, Brown J. Microbial water quality improvement associated with transitioning from intermittent to continuous water supply in Nagpur, India. WATER RESEARCH 2021; 201:117301. [PMID: 34139512 DOI: 10.1016/j.watres.2021.117301] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 05/12/2021] [Accepted: 05/23/2021] [Indexed: 06/12/2023]
Abstract
Nearly half a billion people living in Indian cities receive their drinking water from an intermittent water supply (IWS), which can be associated with degraded water quality and risk of waterborne disease. The municipal water supply in Nagpur, India is transitioning from intermittent to continuous supply in phases. We conducted cross-sectional sampling to compare microbial water quality under IWS and continuous water supply (CWS) in Nagpur. In 2015 and 2017, we collected 146 grab samples and 90 large-volume dead-end ultrafiltration (DEUF) samples (total volume: 6,925 liters). In addition to measuring traditional water quality parameters, we also assayed DEUF samples by droplet digital PCR (ddPCR) for waterborne pathogen gene targets. At household taps served by IWS, we detected targets from enterotoxigenic E. coli, Shigella spp./enteroinvasive E. coli, norovirus GI and GII, adenovirus A-F, Cryptosporidium spp., and Giardia duodenalis. We observed a significant increase in the proportion of grab samples positive for culturable E. coli (p = 0.0007) and DEUF concentrates positive for waterborne pathogen gene targets (p = 0.0098) at household taps served by IWS compared to those served by CWS. IWS continues to be associated with fecal contamination, and, in this study, with increased prevalence of molecular evidence of waterborne pathogens. These findings add mounting evidence that, despite the presence of piped on premise infrastructure, IWS is less likely to meet the requirements for safely-managed drinking water as defined by the Sustainable Development Goals. Importantly, these findings demonstrate the transition from IWS to CWS in Nagpur is yielding meaningful improvements in microbial water quality.
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Affiliation(s)
- Aaron Bivins
- Environmental Change Initiative, University of Notre Dame, 721 Flanner Hall, Notre Dame, IN 46556, USA; Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA
| | - Sarah Lowry
- School of Civil & Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332, USA
| | - Sonal Wankhede
- Director's Research Cell, Council of Scientific and Industrial Research, National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur, India
| | - Rajashree Hajare
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Heather M Murphy
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON N1G 2W1, Canada
| | - Mark Borchardt
- Agricultural Research Service, U.S. Dept of Agriculture, 2615 Yellowstone Drive, Marshfield, WI 54449, USA
| | - Pawan Labhasetwar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Joe Brown
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, 135 Dauer Drive, Chapel Hill NC 27599-7431, USA..
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28
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van den Berg H, Quaye MN, Nguluve E, Schijven J, Ferrero G. Effect of operational strategies on microbial water quality in small scale intermittent water supply systems: The case of Moamba, Mozambique. Int J Hyg Environ Health 2021; 236:113794. [PMID: 34147023 DOI: 10.1016/j.ijheh.2021.113794] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/14/2021] [Accepted: 06/09/2021] [Indexed: 10/21/2022]
Abstract
Intermittent drinking water supply affects the health of over 300 million people globally. In Mozambique, it is largely practiced in cities and small towns. This results in frequent microbial contamination of the supplied drinking water posing a health risk to consumers. In Moamba, a small town in Southern Mozambique with 2,500 water connections, the impact of changes in operational strategies, namely increased chlorine dosage, increased supply duration and first-flush, on the microbial water quality was studied to determine best practices. To that aim, water quality monitoring was enhanced to provide sufficient data on the microbial contamination from 452 samples under the different strategies. The water at the outlet of the water treatment plant during all strategies was free of E. coli complying to the national standards. However, E. coli could be detected at household level. By increasing the chlorine dosage, the number of samples that showed E. coli absence increased at the two sampling locations in the distribution network: in Cimento from 72% to 83% and in Matadouro from 52% to 86%. Modifying the number and duration of supply cycles showed a different impact on the water quality at both locations in the distribution network. A positive effect was shown in Cimento, where the mean concentrations decreased slightly from 0.54 to 0.23 CFU/100 mL and 16.7 to 7.3 CFU/100 mL for E. coli and total coliforms respectively. The percentage of samples positive for bacteria was, however, similar. In contrast, a negative effect was shown in Matadouro where the percentage of positive samples increased and the mean bacterial concentrations increased slightly: E. coli from 0.9 to 1.5 CFU/100 mL and total coliforms 17.6 to 23.0 CFU/100 mL. Enhanced water quality monitoring improved operational strategies safeguarding the microbial water quality. The E. coli contamination of the drinking water at household level could point at recontamination in the distribution or unsafe hygienic practices at household level. Presence of faecal contamination at household level indicates potential presence of pathogens posing a health risk to consumers. Increasing chlorine dosage ensured good microbiological drinking water quality but changing the number of supply cycles had no such effect.
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Affiliation(s)
- Harold van den Berg
- National Institute for Public Health and the Environment (RIVM), WHO Collaborating Centre for Risk Assessment of Pathogens in Food and Water, P.O. Box 1, 3721, MA, Bilthoven, the Netherlands.
| | - Michael Nii Quaye
- IHE Delft Institute for Water Education, Westvest 7, 2611, AX, Delft, the Netherlands.
| | - Eugenia Nguluve
- Collins Ltd, Rua Joseph Ki-zerbo, N. 119 Bairro da Sommerschield, Maputo, Mozambique.
| | - Jack Schijven
- National Institute for Public Health and the Environment (RIVM), WHO Collaborating Centre for Risk Assessment of Pathogens in Food and Water, P.O. Box 1, 3721, MA, Bilthoven, the Netherlands; Earth Sciences, University of Utrecht, Princetonlaan 8a, 3584, CB, Utrecht, the Netherlands.
| | - Giuliana Ferrero
- IHE Delft Institute for Water Education, Westvest 7, 2611, AX, Delft, the Netherlands.
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29
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Wunderlich S, St George Freeman S, Galindo L, Brown C, Kumpel E. Optimizing Household Water Decisions for Managing Intermittent Water Supply in Mexico City. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:8371-8381. [PMID: 34086449 DOI: 10.1021/acs.est.0c08390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
One billion people worldwide experience intermittent water supply (IWS), in which piped water is delivered for limited durations. Households with IWS must invest in water storage infrastructure and often rely on multiple sources of water; therefore, these household-level purchasing and infrastructure decisions is a critical component of water access. Informed by interviews with IWS households, we use radial basis function networks, a type of artificial neural network, to determine optimal household water management decisions that maximize reliability of water supply while minimizing costs for a representative household in Mexico City that uses municipal piped water, trucked water, and rainwater. We find that securing reliable water supply for IWS households is greatly assisted by installation of household storage tanks of at least 2500 L. In the case of IWS households with limited storage options, the overall cost for water supply is reduced by scheduling water deliveries on nonconsecutive days. Rainwater harvesting systems were shown to be economically viable for households with limited water supply. This study demonstrates the importance of considering the management of multiple sources and household storage infrastructure when evaluating water investments in cities with IWS.
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Affiliation(s)
- Savannah Wunderlich
- Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Sarah St George Freeman
- Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Luisa Galindo
- Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Casey Brown
- Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Emily Kumpel
- Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
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30
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Saboe D, Hristovski KD, Burge SR, Burge RG, Taylor E, Hoffman DA. Measurement of free chlorine levels in water using potentiometric responses of biofilms and applications for monitoring and managing the quality of potable water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 766:144424. [PMID: 33421790 DOI: 10.1016/j.scitotenv.2020.144424] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/25/2020] [Accepted: 12/08/2020] [Indexed: 05/15/2023]
Abstract
Residual free chlorine is not monitored continuously at scale in drinking water distribution systems because existing real-time sensor technologies require frequent maintenance, cleaning, and calibration, which makes these products too costly to be used throughout a distribution system. As a result, current measurement approaches require manual sampling, which is not feasible for the consistent monitoring of free chlorine because chlorine concentrations vary significantly throughout pipeline distribution and over time and space. This research presents an alternative and cost-effective method of predicting free chlorine levels in drinking water using graphite electrodes coated with naturally grown microbial biofilms. This Microbial Potentiometric Sensor (MPS) array was installed in a Continuously Mixed Batch Reactor (CMBR), and drinking water containing variable free chlorine concentrations. The chlorine concentrations were introduced in a controlled manner, and the MPS signals were monitored over time. MPS signals were measured from the change in Open Circuit Potential (OCP) across the MPS array in real-time. An empirically derived relationship between the normalized change in OCP and free chlorine was established by fitting individual and average MPS data to a decaying exponential growth function in order to predict free chlorine levels. The results show that free chlorine can be predicted with reasonable accuracy, with model validation showing an average absolute error of ±0.09 ppm below 1.1 ppm and ±0.30 ppm between 1.1 and 2.7 ppm. However, the accuracy of predictions was reduced at higher free chlorine levels. The researchers conclude that MPS systems may benefit drinking water distribution systems by measuring free chlorine. These advantages of the MPS are especially pronounced in the developing world because this system is inexpensive and does not require routine maintenance or cleaning. The system relies on a naturally forming and regenerating biofilm and an inexpensive potentiometric meter to produce stable measurements.
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Affiliation(s)
- Daniel Saboe
- The Polytechnic School, Ira A. Fulton Schools of Engineering, Arizona State University, 7171 E. Sonoran Arroyo Mall, Mesa, AZ 85212, United States of America
| | - Kiril D Hristovski
- The Polytechnic School, Ira A. Fulton Schools of Engineering, Arizona State University, 7171 E. Sonoran Arroyo Mall, Mesa, AZ 85212, United States of America.
| | - Scott R Burge
- Burge Environmental Inc., 6100 S. Maple Avenue Suite 114, Tempe, AZ 85283, United States of America
| | - Russell G Burge
- Burge Environmental Inc., 6100 S. Maple Avenue Suite 114, Tempe, AZ 85283, United States of America
| | - Evan Taylor
- The Polytechnic School, Ira A. Fulton Schools of Engineering, Arizona State University, 7171 E. Sonoran Arroyo Mall, Mesa, AZ 85212, United States of America; Burge Environmental Inc., 6100 S. Maple Avenue Suite 114, Tempe, AZ 85283, United States of America
| | - David A Hoffman
- Burge Environmental Inc., 6100 S. Maple Avenue Suite 114, Tempe, AZ 85283, United States of America
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31
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Byrne DM, Hamilton KA, Houser SA, Mubasira M, Katende D, Lohman HAC, Trimmer JT, Banadda N, Zerai A, Guest JS. Navigating Data Uncertainty and Modeling Assumptions in Quantitative Microbial Risk Assessment in an Informal Settlement in Kampala, Uganda. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:5463-5474. [PMID: 33750111 DOI: 10.1021/acs.est.0c05693] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Decision-makers in developing communities often lack credible data to inform decisions related to water, sanitation, and hygiene. Quantitative microbial risk assessment (QMRA), which quantifies pathogen-related health risks across exposure routes, can be informative; however, the utility of QMRA for decision-making is often undermined by data gaps. This work integrates QMRA, uncertainty and sensitivity analyses, and household surveys in Bwaise, Kampala (Uganda) to characterize the implications of censored data management, identify sources of uncertainty, and incorporate risk perceptions to improve the suitability of QMRA for informal settlements or similar settings. In Bwaise, drinking water, hand rinse, and soil samples were collected from 45 households and supplemented with data from 844 surveys. Quantified pathogen (adenovirus, Campylobacter jejuni, and Shigella spp./EIEC) concentrations were used with QMRA to model infection risks from exposure through drinking water, hand-to-mouth contact, and soil ingestion. Health risks were most sensitive to pathogen data, hand-to-mouth contact frequency, and dose-response models (particularly C. jejuni). When managing censored data, results from upper limits of detection, half of limits of detection, and uniform distributions returned similar results, which deviated from lower limits of detection and maximum likelihood estimation imputation approaches. Finally, risk perceptions (e.g., it is unsafe to drink directly from a water source) were identified to inform risk management.
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Affiliation(s)
- Diana M Byrne
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, 3221 Newmark Civil Engineering Laboratory, Urbana, Illinois 61801, United States
| | - Kerry A Hamilton
- The School with Sustainable Engineering and the Built Environment and The Biodesign Institute Center for Environmental Health Engineering, Arizona State University, Tempe, Arizona 85287, United States
| | - Stephanie A Houser
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, 3221 Newmark Civil Engineering Laboratory, Urbana, Illinois 61801, United States
| | - Muwonge Mubasira
- Community Integrated Development Initiatives, P.O. Box 764, Kampala, Uganda
| | - David Katende
- Community Integrated Development Initiatives, P.O. Box 764, Kampala, Uganda
| | - Hannah A C Lohman
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, 3221 Newmark Civil Engineering Laboratory, Urbana, Illinois 61801, United States
| | - John T Trimmer
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, 3221 Newmark Civil Engineering Laboratory, Urbana, Illinois 61801, United States
| | - Noble Banadda
- Department of Agricultural & Biosystems Engineering, Makerere University, P.O. Box 7062, Kampala, Uganda
| | - Assata Zerai
- Department of Sociology, University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Jeremy S Guest
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, 3221 Newmark Civil Engineering Laboratory, Urbana, Illinois 61801, United States
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Capone D, Bivins A, Knee J, Cumming O, Nalá R, Brown J. Quantitative Microbial Risk Assessment of Pediatric Infections Attributable to Ingestion of Fecally Contaminated Domestic Soils in Low-Income Urban Maputo, Mozambique. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:1941-1952. [PMID: 33472364 PMCID: PMC7860170 DOI: 10.1021/acs.est.0c06972] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 01/07/2021] [Accepted: 01/08/2021] [Indexed: 05/03/2023]
Abstract
Rigorous studies of water, sanitation, and hygiene interventions in low- and middle-income countries (LMICs) suggest that children are exposed to enteric pathogens via multiple interacting pathways, including soil ingestion. In 30 compounds (household clusters) in low-income urban Maputo, Mozambique, we cultured Escherichia coli and quantified gene targets from soils (E. coli: ybbW, Shigella/enteroinvasive E. coli (EIEC): ipaH, Giardia duodenalis: β-giardin) using droplet digital PCR at three compound locations (latrine entrance, solid waste area, dishwashing area). We found that 88% of samples were positive for culturable E. coli (mean = 3.2 log10 CFUs per gram of dry soil), 100% for molecular E. coli (mean = 5.9 log10 gene copies per gram of dry soil), 44% for ipaH (mean = 2.5 log10), and 41% for β-giardin (mean = 2.1 log10). Performing stochastic quantitative microbial risk assessment using soil ingestion parameters from an LMIC setting for children 12-23 months old, we estimated that the median annual infection risk by G. duodenalis was 7100-fold (71% annual infection risk) and by Shigella/EIEC was 4000-fold (40% annual infection risk) greater than the EPA's standard for drinking water. Compounds in Maputo, and similar settings, require contact and source control strategies to reduce the ingestion of contaminated soil and achieve acceptable levels of risk.
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Affiliation(s)
- Drew Capone
- Civil
and Environmental Engineering, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
- Department
of Environmental Sciences and Engineering, Gillings School of Public
Health, University of North Carolina at
Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Aaron Bivins
- Department
of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Jackie Knee
- Department
of Disease Control, London School of Hygiene
and Tropical Medicine, London WC1E 7HT, U.K.
| | - Oliver Cumming
- Department
of Disease Control, London School of Hygiene
and Tropical Medicine, London WC1E 7HT, U.K.
| | - Rassul Nalá
- Ministério
da Saúde, Instituto Nacional de Saúde Maputo, Maputo 1100, Mozambique
| | - Joe Brown
- Civil
and Environmental Engineering, Georgia Institute
of Technology, Atlanta, Georgia 30332, United States
- Department
of Environmental Sciences and Engineering, Gillings School of Public
Health, University of North Carolina at
Chapel Hill, Chapel Hill, North Carolina 27599, United States
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Buckerfield SJ, Quilliam RS, Bussiere L, Waldron S, Naylor LA, Li S, Oliver DM. Chronic urban hotspots and agricultural drainage drive microbial pollution of karst water resources in rural developing regions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 744:140898. [PMID: 32721677 DOI: 10.1016/j.scitotenv.2020.140898] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/16/2020] [Accepted: 07/09/2020] [Indexed: 06/11/2023]
Abstract
Contamination of surface and groundwater systems with human and animal faecal matter leads to exposure of reliant populations to disease causing micro-organisms. This exposure route remains a major cause of infection and mortality in developing countries, particularly rural regions. To meet the UN's sustainable development goal 6: Ensure availability and sustainable management of water and sanitation for all, we need to identify the key controls on faecal contamination across relevant settings. We conducted a high-resolution spatial study of E. coli concentration in catchment drainage waters over 6 months in a mixed land-use catchment in the extensive karst region extending across impoverished southwest China. Using a mixed effects modelling framework, we tested how land-use, karst hydrology, antecedent meteorological conditions, agricultural cycles, hydrochemistry, and position in the catchment system affected E. coli concentrations. Land-use was the best predictor of faecal contamination levels. Sites in urban areas were chronically highly contaminated, but water draining from agricultural land was also consistently contaminated and there was a catchment wide pulse of higher E. coli concentrations, turbidity, and discharge during paddy field drainage. E. coli concentration increased with increasing antecedent rainfall across all land-use types and compartments of the karst hydrological system (underground and surface waters), but decreased with increasing pH. This is interpreted to be a result of processes affecting pH, such as water residence time, rather than the direct effect of pH on E. coli survival. Improved containment and treatment of human waste in areas of higher population density would likely reduce contamination hotspots, and further research is needed to identify the nature and distribution of sources in agricultural land.
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Affiliation(s)
- Sarah J Buckerfield
- Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom.
| | - Richard S Quilliam
- Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom
| | - Luc Bussiere
- Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom
| | - Susan Waldron
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Larissa A Naylor
- School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Siliang Li
- Institute of Surface-Earth System Science, Tianjin University, Tianjin 300072, China
| | - David M Oliver
- Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling FK9 4LA, United Kingdom
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Goddard FB, Ban R, Barr DB, Brown J, Cannon J, Colford JM, Eisenberg JNS, Ercumen A, Petach H, Freeman MC, Levy K, Luby SP, Moe C, Pickering AJ, Sarnat JA, Stewart J, Thomas E, Taniuchi M, Clasen T. Measuring Environmental Exposure to Enteric Pathogens in Low-Income Settings: Review and Recommendations of an Interdisciplinary Working Group. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:11673-11691. [PMID: 32813503 PMCID: PMC7547864 DOI: 10.1021/acs.est.0c02421] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 08/18/2020] [Accepted: 08/19/2020] [Indexed: 05/06/2023]
Abstract
Infections with enteric pathogens impose a heavy disease burden, especially among young children in low-income countries. Recent findings from randomized controlled trials of water, sanitation, and hygiene interventions have raised questions about current methods for assessing environmental exposure to enteric pathogens. Approaches for estimating sources and doses of exposure suffer from a number of shortcomings, including reliance on imperfect indicators of fecal contamination instead of actual pathogens and estimating exposure indirectly from imprecise measurements of pathogens in the environment and human interaction therewith. These shortcomings limit the potential for effective surveillance of exposures, identification of important sources and modes of transmission, and evaluation of the effectiveness of interventions. In this review, we summarize current and emerging approaches used to characterize enteric pathogen hazards in different environmental media as well as human interaction with those media (external measures of exposure), and review methods that measure human infection with enteric pathogens as a proxy for past exposure (internal measures of exposure). We draw from lessons learned in other areas of environmental health to highlight how external and internal measures of exposure can be used to more comprehensively assess exposure. We conclude by recommending strategies for advancing enteric pathogen exposure assessments.
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Affiliation(s)
- Frederick
G. B. Goddard
- Gangarosa
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
| | - Radu Ban
- Bill and
Melinda Gates Foundation, Seattle, Washington 98109, United States
| | - Dana Boyd Barr
- Gangarosa
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
| | - Joe Brown
- School of
Civil and Environmental Engineering, Georgia
Institute of Technology, Atlanta, Georgia 30332, United States
| | - Jennifer Cannon
- Centers
for Disease Control and Prevention Foundation, Atlanta, Georgia 30308, United States
| | - John M. Colford
- Division
of Epidemiology and Biostatistics, School of Public Health, University of California−Berkeley, Berkeley, California 94720, United States
| | - Joseph N. S. Eisenberg
- Department
of Epidemiology, University of Michigan
School of Public Health, Ann Arbor, Michigan 48109, United States
| | - Ayse Ercumen
- Department
of Forestry and Environmental Resources, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Helen Petach
- U.S. Agency
for International Development, Washington, DC 20004, United States
| | - Matthew C. Freeman
- Gangarosa
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
| | - Karen Levy
- Department
of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, United States
| | - Stephen P. Luby
- Division
of Infectious Diseases and Geographic Medicine, Stanford University, California 94305, United States
| | - Christine Moe
- Center
for
Global Safe Water, Sanitation and Hygiene, Rollins School of Public
Health, Emory University, Atlanta, Georgia 30322, United States
| | - Amy J. Pickering
- Department
of Civil and Environmental Engineering, School of Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Jeremy A. Sarnat
- Gangarosa
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
| | - Jill Stewart
- Department
of Environmental Sciences and Engineering, Gillings School of Global
Public Health, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Evan Thomas
- Mortenson
Center in Global Engineering, University
of Colorado Boulder, Boulder, Colorado 80303, United States
| | - Mami Taniuchi
- Division
of Infectious Diseases and International Health, Department of Medicine, University of Virginia, Charlottesville, Virginia 22903, United States
| | - Thomas Clasen
- Gangarosa
Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, United States
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Rosenthal J, Arku RE, Baumgartner J, Brown J, Clasen T, Eisenberg JN, Hovmand P, Jagger P, Luke DA, Quinn A, Yadama GN. Systems Science Approaches for Global Environmental Health Research: Enhancing Intervention Design and Implementation for Household Air Pollution (HAP) and Water, Sanitation, and Hygiene (WASH) Programs. ENVIRONMENTAL HEALTH PERSPECTIVES 2020; 128:105001. [PMID: 33035121 PMCID: PMC7546437 DOI: 10.1289/ehp7010] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 09/13/2020] [Accepted: 09/15/2020] [Indexed: 05/23/2023]
Abstract
BACKGROUND Two of the most important causes of global disease fall in the realm of environmental health: household air pollution (HAP) and poor water, sanitation, and hygiene (WASH) conditions. Interventions, such as clean cookstoves, household water treatment, and improved sanitation facilities, have great potential to yield reductions in disease burden. However, in recent trials and implementation efforts, interventions to improve HAP and WASH conditions have shown few of the desired health gains, raising fundamental questions about current approaches. OBJECTIVES We describe how the failure to consider the complex systems that characterize diverse real-world conditions may doom promising new approaches prematurely. We provide examples of the application of systems approaches, including system dynamics, network analysis, and agent-based modeling, to the global environmental health priorities of HAP and WASH research and programs. Finally, we offer suggestions on how to approach systems science. METHODS Systems science applied to environmental health can address major challenges by a) enhancing understanding of existing system structures and behaviors that accelerate or impede aims; b) developing understanding and agreement on a problem among stakeholders; and c) guiding intervention and policy formulation. When employed in participatory processes that engage study populations, policy makers, and implementers, systems science helps ensure that research is responsive to local priorities and reflect real-world conditions. Systems approaches also help interpret unexpected outcomes by revealing emergent properties of the system due to interactions among variables, yielding complex behaviors and sometimes counterintuitive results. DISCUSSION Systems science offers powerful and underused tools to accelerate our ability to identify barriers and facilitators to success in environmental health interventions. This approach is especially useful in the context of implementation research because it explicitly accounts for the interaction of processes occurring at multiple scales, across social and environmental dimensions, with a particular emphasis on linkages and feedback among these processes. https://doi.org/10.1289/EHP7010.
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Affiliation(s)
- Joshua Rosenthal
- Division of Epidemiology and Population Studies, Fogarty International Center, National Institutes of Health, Department of Health and Human Services, Washington, DC, USA
| | - Raphael E. Arku
- Department of Environmental Health Sciences, Department of Environmental Health Sciences, University of Massachusetts, Amherst, Amherst, Massachusetts, USA
| | - Jill Baumgartner
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada
| | - Joe Brown
- Department of Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Thomas Clasen
- Department of Environmental Health, Emory University, Atlanta, Georgia, USA
| | | | - Peter Hovmand
- Center for Community Health Integration, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
| | - Pamela Jagger
- School for Environment and Sustainability, University of Michigan, Ann Arbor, Michigan, USA
| | - Douglas A. Luke
- Center for Public Health Systems Science, Brown School, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Ashlinn Quinn
- Division of Epidemiology and Population Studies, Fogarty International Center, National Institutes of Health, Department of Health and Human Services, Washington, DC, USA
| | - Gautam N. Yadama
- School of Social Work, Boston College, Boston, Massachusetts, USA
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Hung DT, Thi Cuc V, Thi Bich Phuong V, Thi Thanh Diu D, Thi Huyen Trang N, Phuong Thoa N, Thi Tuyet Chinh D, Manh Hung T, Manh Linh C, Van Long N. Evaluation of Drinking Water Quality in Schools in a District Area in Hanoi, Vietnam. ENVIRONMENTAL HEALTH INSIGHTS 2020; 14:1178630220959672. [PMID: 33013160 PMCID: PMC7513401 DOI: 10.1177/1178630220959672] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Accepted: 08/26/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Drinking water quality affects directly human health. Assessment and prevention of water-borne diseases are crucial for primary prevention, especially for children. OBJECTIVE The main aim of this study was to investigate the quality of drinking water from tap water in preschools and primary schools in a district area in Hanoi City, Vietnam. METHODS A cross-sectional study was performed from August to October 2019. Water samples from tap water of 154 schools in a district area of Hanoi were collected to determine the quality of drinking water. From each school, at least 2 bottles of water samples were collected on the basis of a standard operating procedure (SOP). Each water sample was analyzed for microbial and physicochemical parameters, including Color, Taste and Odor, Turbidity, pH, Nitrite, Nitrate, Ammonium, Total Iron, Permanganate, Chloride, Hardness, Total Manganese, Sulfate, Arsenic, Coliform, and E.coli, by analytical methods. The obtained values of each parameter were compared with the standard values set by WHO and National Technical Regulation on Domestic Water Quality of Vietnam. RESULTS All of the schools employed community water system as a main source for drinking water. The results showed that all tested samples were found to be within the standards for some physicochemical properties, including Color, Taste and Odor, Hardness, Chloride, Total Iron (Fe2+ và Fe3+), Total Manganese (Mn), Nitrate (NO3 -), Sulfate (SO4 2-), and Total Arsenic (As). On the other hand, some samples did not meet the allowable limits of the national standard, due to pH (3.9%), Turbidity (0.6%), Nitrite (3.2%), Permanganate (6.5%), and Ammonium (5.8%). Furthermore, the microbial data revealed that the substandard water samples from municipal water systems were contaminated by Coliform (9.7%) and/or E.coli (7.8%). CONCLUSIONS AND RECOMMENDATIONS Contaminants such as bacterial and chemical agents in to drinking water could be occurred during transport, storage and handling before using by the consumer without regular surveillance. A periodic treatment procedure and monitoring system to keep the level of microbial and chemical contamination of drinking water in schools under control should be performed.
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Affiliation(s)
- Dang The Hung
- Laboratory Center, Hanoi University of
Public Health, Hanoi, Vietnam
| | - Vu Thi Cuc
- Laboratory Center, Hanoi University of
Public Health, Hanoi, Vietnam
| | | | - Dao Thi Thanh Diu
- Laboratory Center, Hanoi University of
Public Health, Hanoi, Vietnam
| | | | | | | | - Ta Manh Hung
- National Institute of Drug Quality
Control, Hanoi, Vietnam
| | - Chu Manh Linh
- Laboratory Center, Hanoi University of
Public Health, Hanoi, Vietnam
| | - Nguyen Van Long
- Laboratory Center, Hanoi University of
Public Health, Hanoi, Vietnam
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37
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Capone D, Cumming O, Nichols D, Brown J. Water and Sanitation in Urban America, 2017-2019. Am J Public Health 2020; 110:1567-1572. [PMID: 32816545 DOI: 10.2105/ajph.2020.305833] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Objectives. To estimate the population lacking at least basic water and sanitation access in the urban United States.Methods. We compared national estimates of water and sanitation access from the World Health Organization/United Nations Children's Fund Joint Monitoring Program with estimates from the US Department of Housing and Urban Development on homelessness and the American Community Survey on household water and sanitation facilities.Results. We estimated that at least 930 000 persons in US cities lacked sustained access to at least basic sanitation and 610 000 to at least basic water access, as defined by the United Nations.Conclusions. After accounting for those experiencing homelessness and substandard housing, our estimate of people lacking at least basic water equaled current estimates (n = 610 000)-without considering water quality-and greatly exceeded estimates of sanitation access (n = 28 000).Public Health Implications. Methods to estimate water and sanitation access in the United States should include people experiencing homelessness and other low-income groups, and specific policies are needed to reduce disparities in urban sanitation. We recommend similar estimation efforts for other high-income countries currently reported as having near universal sanitation access.
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Affiliation(s)
- Drew Capone
- Drew Capone and Joe Brown are with Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta. Oliver Cumming is with the Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom. Dennis Nichols is with the Department of Global Health, Rollins School of Public Health, Emory University, Atlanta
| | - Oliver Cumming
- Drew Capone and Joe Brown are with Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta. Oliver Cumming is with the Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom. Dennis Nichols is with the Department of Global Health, Rollins School of Public Health, Emory University, Atlanta
| | - Dennis Nichols
- Drew Capone and Joe Brown are with Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta. Oliver Cumming is with the Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom. Dennis Nichols is with the Department of Global Health, Rollins School of Public Health, Emory University, Atlanta
| | - Joe Brown
- Drew Capone and Joe Brown are with Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta. Oliver Cumming is with the Department of Disease Control, London School of Hygiene and Tropical Medicine, London, United Kingdom. Dennis Nichols is with the Department of Global Health, Rollins School of Public Health, Emory University, Atlanta
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Wilson AM, King MF, López-García M, Weir MH, Sexton JD, Canales RA, Kostov GE, Julian TR, Noakes CJ, Reynolds KA. Evaluating a transfer gradient assumption in a fomite-mediated microbial transmission model using an experimental and Bayesian approach. J R Soc Interface 2020; 17:20200121. [PMID: 32574546 PMCID: PMC7328381 DOI: 10.1098/rsif.2020.0121] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Current microbial exposure models assume that microbial exchange follows a concentration gradient during hand-to-surface contacts. Our objectives were to evaluate this assumption using transfer efficiency experiments and to evaluate a model's ability to explain concentration changes using approximate Bayesian computation (ABC) on these experimental data. Experiments were conducted with two phages (MS2, ΦX174) simultaneously to study bidirectional transfer. Concentrations on the fingertip and surface were quantified before and after fingertip-to-surface contacts. Prior distributions for surface and fingertip swabbing efficiencies and transfer efficiency were used to estimate concentrations on the fingertip and surface post contact. To inform posterior distributions, Euclidean distances were calculated for predicted detectable concentrations (log10 PFU cm−2) on the fingertip and surface post contact in comparison with experimental values. To demonstrate the usefulness of posterior distributions in calibrated model applications, posterior transfer efficiencies were used to estimate rotavirus infection risks for a fingertip-to-surface and subsequent fingertip-to-mouth contact. Experimental findings supported the transfer gradient assumption. Through ABC, the model explained concentration changes more consistently when concentrations on the fingertip and surface were similar. Future studies evaluating microbial transfer should consider accounting for differing fingertip-to-surface and surface-to-fingertip transfer efficiencies and extend this work for other microbial types.
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Affiliation(s)
- Amanda M Wilson
- Department of Community, Environment and Policy, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
| | | | | | - Mark H Weir
- Division of Environmental Health Sciences, College of Public Health, The Ohio State University, Columbus, OH, USA
| | - Jonathan D Sexton
- Department of Community, Environment and Policy, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
| | - Robert A Canales
- Department of Community, Environment and Policy, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
| | - Georgiana E Kostov
- Department of Community, Environment and Policy, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
| | - Timothy R Julian
- Department of Environmental Microbiology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, CH-8600 Dübendorf, Switzerland.,Epidemiology and Public Health, Swiss Tropical and Public Health Institute, P.O. Box, CH-4002 Basel, Switzerland.,University of Basel, PO Box, CH-4003 Basel, Switzerland
| | | | - Kelly A Reynolds
- Department of Community, Environment and Policy, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
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Intermittent Water Supply Management, Household Adaptation, and Drinking Water Quality: A Comparative Study in Two Chinese Provinces. WATER 2020. [DOI: 10.3390/w12051361] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Intermittent water supply (IWS) is a relatively common phenomenon across the world as well as in rural and peri-urban areas across China, though there has been little IWS-focused research from China published to date. IWS consumers typically adopt a range of strategies to cope with insufficient water supply, poor drinking water quality, and associated inconveniences. In this study, we collected a range of data from small-scale utilities and households in two IWS systems and two continuous water supply (CWS) systems, as well as from comparison groups, in Shandong and Hubei provinces. Data collection included water quality testing, interviews, and surveys on behavioral adaptations, coping strategies, water-related health perceptions, and other metrics of consumer satisfaction. Overall, we found that the IWS coping strategies employed in northern China (Shandong) were associated with generally safe, but inconvenient, water access, whereas adaptation strategies observed in southern China (Hubei) appeared to improve convenience, but not water quality. Compared to the CWS comparison groups, we did not observe significant differences in water- and sanitation-related behaviors in the IWS groups, suggesting interventions to increase adaptive and protective behaviors at the household level might further improve safe water access for households living with IWS. Overall, although the water supply infrastructure in these study areas appeared to be in relatively good condition, in contrast to reported data on IWS systems in other countries, we observed multiple risk factors associated with the water treatment and distribution processes in these IWS systems. Among policy recommendations, our results suggest that the implementation of Water Safety Plans in China would likely improve the management of drinking water treatment and, by extension, safe drinking water supply under conditions of IWS.
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Uprety S, Dangol B, Nakarmi P, Dhakal I, Sherchan SP, Shisler JL, Jutla A, Amarasiri M, Sano D, Nguyen TH. Assessment of microbial risks by characterization of Escherichia coli presence to analyze the public health risks from poor water quality in Nepal. Int J Hyg Environ Health 2020; 226:113484. [DOI: 10.1016/j.ijheh.2020.113484] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 02/07/2020] [Accepted: 02/09/2020] [Indexed: 02/01/2023]
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Lee GO, Whitney HJ, Blum AG, Lybik N, Cevallos W, Trueba G, Levy K, Eisenberg JNS. Household coping strategies associated with unreliable water supplies and diarrhea in Ecuador, an upper-middle-income country. WATER RESEARCH 2020; 170:115269. [PMID: 31739243 PMCID: PMC6962559 DOI: 10.1016/j.watres.2019.115269] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 10/29/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
The Sustainable Development Goals recognize that the availability and quality of improved water sources affect how households use and benefit from these sources. Although unreliability in piped water supplies in low- and middle-income countries (LMICs) has been described, few studies have assessed household coping strategies in response to unreliable water supplies and associated health outcomes. We characterized unreliability in the piped water supply of the town of Borbón, Ecuador over the twelve years following a major upgrade, as well as household coping strategies and associations with diarrhea. We examined trends in primary and secondary drinking water sources, water storage, and water treatment using longitudinal data collected from 2005 to 2012. In 2017, a follow-up survey was administered (N = 202) and a subset of 84 household water samples were tested for chlorine residual levels and microbial contamination. From 2005 to 2017, access to a household water connection increased from 19.4% to 90.3%. However, reliability decreased over time, as in the latter half of 2009, households had access to piped water 79% of the time, compared to 63% by 2017. Piped water samples were highly contaminated with total coliforms (100% of samples) and Escherichia coli (89% of samples). From 2005 to 2017, households less likely to report drinking water treatment (50.6%-5.0%). And from 2009 to 2017, bottled water was increasingly consumed as the primary drinking water source (18.8%-62.4%). From 2005 to 2012, having a household connection was not statistically significantly associated with diarrhea case status (OR: 0.86 95%CI: 0.53, 1.39). Neither household water treatment nor bottled water consumption were negatively associated with diarrhea. Increased water storage was associated with diarrhea (OR: 1.33 per 10L of water stored, 95%CI: 1.05, 1.69). Household water treatment, and consumption of purchased bottled water, two coping strategies that households may have undertaken in response to an unreliable water supply, were not associated with a reduced likelihood of diarrhea. These data suggest a need to understand how impoverished rural households in LMICs respond to unreliable water supplies, and to develop heath messaging appropriate for this context.
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Affiliation(s)
- Gwenyth O Lee
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI, USA.
| | - Holly J Whitney
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - Annalise G Blum
- Department of Earth and Planetary Science, Johns Hopkins University, Baltimore, MD, USA
| | - Noah Lybik
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI, USA
| | - William Cevallos
- Instituto de Biomedicina, Carrera e Medicina, Universidad Central de Ecuador, Ecuador
| | - Gabriel Trueba
- Institutito de Microbiología, Colegio de Ciencias Biológicas y Ambientales, Universidad San Francisco de Quito, Quito, Ecuador
| | - Karen Levy
- Department of Environmental Health, Emory University, Atlanta, GA, USA
| | - Joseph N S Eisenberg
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI, USA
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Thompson AL, Nicholas KM, Watson E, Terán E, Bentley ME. Water, food, and the dual burden of disease in Galápagos, Ecuador. Am J Hum Biol 2020; 32:e23344. [PMID: 31642150 PMCID: PMC7114884 DOI: 10.1002/ajhb.23344] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 09/24/2019] [Accepted: 09/25/2019] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Rapid development in low- and middle-income countries (LMIC) has led to changes in diet that have outpaced water and sanitation improvements, contributing to a dual burden of overweight and noncommunicable disease risk factors (OWT/NCD) and undernutrition and infectious disease symptoms (UND/ID) within individuals and households. Yet, little work has examined the joint impact of water and food exposures on the development of the dual burden. METHODS We use data from Ecuador's nationally representative Encuesta Nacional de Salud y Nutrición (ENSANUT-ECU) to test whether water access and quality and diet quality and security are associated with OWT/NCD and UND/ID among 1119 children and 1582 adults in Galápagos. Adjusted multinomial and logistic models were used to test the separate and joint associations between water and food exposures and the dual burden and its components at the individual and household levels. RESULTS The prevalence of the dual burden of OWT/NCD and UND/ID was 16% in children, 33% in adults, and 90% in households. Diet quality was associated with a higher risk of dual burden in individuals and households. Mild food insecurity was positively associated with the risk of dual burden at the household level. No water variable separately predicted the dual burden. Joint exposure to poor water access and food insecurity was associated with greater odds of dual burden in households. CONCLUSION Our results suggest that unhealthy diets and poor water quality contribute to the dual burden at the individual and household levels. Addressing both food and water limitations is important in LMIC.
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Affiliation(s)
- Amanda L Thompson
- Department of Anthropology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Khristopher M Nicholas
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Elijah Watson
- Department of Anthropology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Enrique Terán
- Colegio de Ciencias de la Salud, Universidad de San Francisco Quito, Quito, Ecuador
- Galapagos Science Center, San Cristobal, Ecuador
| | - Margaret E Bentley
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
- Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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Abstract
Water is one of the most important substances on earth and without it life cannot exist. However, poor water quality in many parts of the world has increased the number of water-related diseases, making it the leading cause of disease and death globally for both young and old. Waterborne pathogens cause diseases in humans through two major exposure pathways: drinking water and recreational waters. This chapter on waterborne pathogens will be starting with an introduction, followed by descriptions on classical waterborne pathogens; bacteria, viruses, protozoans, and helminths placing emphasis on the World Health Organization guidelines. Further to conventional waterborne pathogens, fresh organisms and new strains from already known pathogens are being identified and that present important additional challenges to both the water and public health sectors. Hence later part of the chapter focuses on the potential waterborne pathogens and will conclude with a summary of the content.
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Affiliation(s)
- D.N. Magana-Arachchi
- Molecular Microbiology & Human Diseases Unit, National Institute of Fundamental Studies, Kandy, Sri Lanka
| | - R.P. Wanigatunge
- Department of Plant and Molecular Biology, University of Kelaniya, Kelaniya, Sri Lanka
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Sinharoy SS, Pittluck R, Clasen T. Review of drivers and barriers of water and sanitation policies for urban informal settlements in low-income and middle-income countries. UTILITIES POLICY 2019; 60:100957. [PMID: 32214692 PMCID: PMC7067261 DOI: 10.1016/j.jup.2019.100957] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
This study examined drivers and barriers of water, sanitation, and hygiene (WASH) policies in urban informal settlements in low and middle-income countries. We conducted a search of peer-reviewed and grey literature published between January 2000 and April 2018. We organized evidence into six domains of drivers and barriers: economic, spatial, social, institutional, political, and informational. Key drivers included donor prioritization and collective action, while key barriers included social exclusion, lack of land or dwelling tenure status, the political economy of decision-making, and insufficient data. Ensuring responsive water and sanitation policies for informal settlements will require inter-disciplinary collaboration and both top-down and bottom-up approaches.
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Brouwer AF, Masters NB, Eisenberg JNS. Quantitative Microbial Risk Assessment and Infectious Disease Transmission Modeling of Waterborne Enteric Pathogens. Curr Environ Health Rep 2019; 5:293-304. [PMID: 29679300 DOI: 10.1007/s40572-018-0196-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
PURPOSE OF REVIEW Waterborne enteric pathogens remain a global health threat. Increasingly, quantitative microbial risk assessment (QMRA) and infectious disease transmission modeling (IDTM) are used to assess waterborne pathogen risks and evaluate mitigation. These modeling efforts, however, have largely been conducted independently for different purposes and in different settings. In this review, we examine the settings where each modeling strategy is employed. RECENT FINDINGS QMRA research has focused on food contamination and recreational water in high-income countries (HICs) and drinking water and wastewater in low- and middle-income countries (LMICs). IDTM research has focused on large outbreaks (predominately LMICs) and vaccine-preventable diseases (LMICs and HICs). Human ecology determines the niches that pathogens exploit, leading researchers to focus on different risk assessment research strategies in different settings. To enhance risk modeling, QMRA and IDTM approaches should be integrated to include dynamics of pathogens in the environment and pathogen transmission through populations.
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Affiliation(s)
- Andrew F Brouwer
- Department of Epidemiology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Nina B Masters
- Department of Epidemiology, University of Michigan, Ann Arbor, MI, 48109, USA
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Canales RA, Wilson AM, Sinclair RG, Soto-Beltran M, Pearce-Walker J, Molina M, Penny M, Reynolds KA. Microbial study of household hygiene conditions and associated Listeria monocytogenes infection risks for Peruvian women. Trop Med Int Health 2019; 24:899-921. [PMID: 31066175 DOI: 10.1111/tmi.13246] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
OBJECTIVES To develop an exposure and risk assessment model to estimate listeriosis infection risks for Peruvian women. METHODS A simulation model was developed utilising Listeria monocytogenes concentrations on kitchen and latrine surfaces in Peruvian homes, hand trace data from Peruvian women and behavioural data from literature. Scenarios involving varying proportions of uncontaminated, or 'clean', surfaces and non-porous surfaces were simulated. Infection risks were estimated for 4, 6 and 8 h of behaviours and interactions with surfaces. RESULTS Although infection risks were estimated across scenarios for various time points (e.g. 4, 6, 8 h), overall mean estimated infection risks for all scenarios were ≥ 0.31. Infection risks increased as the proportions of clean surfaces decreased. Hand-to-general surface contacts accounted for the most cumulative change in L. monocytogenes concentration on hands. CONCLUSIONS In addition to gaining insights on how human behaviours affect exposure and infection risk, this model addressed uncertainties regarding the influence of household surface contamination levels. Understanding the influence of surface contamination in preventing pathogen transmission in households could help to develop intervention strategies to reduce L. monocytogenes infection and associated health risks.
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Affiliation(s)
- Robert A Canales
- Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
| | - Amanda M Wilson
- Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
| | - Ryan G Sinclair
- Loma Linda University School of Public Health, Loma Linda, CA, USA
| | - Marcela Soto-Beltran
- Facultad Ciencias Químico Biológicas, Universidad Autónoma de Sinaloa, Culiacan, Mexico
| | | | | | - Mary Penny
- Instituto de Investigación Nutricional, Lima, Peru
| | - Kelly A Reynolds
- Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ, USA
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Understanding the impacts of intermittent supply on the drinking water microbiome. Curr Opin Biotechnol 2019; 57:167-174. [PMID: 31100615 DOI: 10.1016/j.copbio.2019.04.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 04/14/2019] [Accepted: 04/15/2019] [Indexed: 11/21/2022]
Abstract
Increasing access to piped water in low-income and middle-income countries combined with the many factors that threaten our drinking water supply infrastructure mean that intermittent water supply (IWS) will remain a common practice around the world. Common features of IWS include water stagnation, pipe drainage, intrusion, backflow, first flush events, and household storage. IWS has been shown to cause degradation as measured by traditional microbial water quality indicators. In this review, we build on new insights into the microbial ecology of continuous water supply systems revealed by sequencing methods to speculate about how intermittent supply conditions may further influence the drinking water microbiome, and identify priorities for future research.
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DuChanois RM, Liddle ES, Fenner RA, Jeuland M, Evans B, Cumming O, Zaman RU, Mujica-Pereira AV, Ross I, Gribble MO, Brown J. Factors Associated with Water Service Continuity for the Rural Populations of Bangladesh, Pakistan, Ethiopia, and Mozambique. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:4355-4363. [PMID: 30917279 PMCID: PMC6724210 DOI: 10.1021/acs.est.8b07173] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Access to continuous water supply is key for improving health and economic outcomes in rural areas of low- and middle-income countries, but the factors associated with continuous water access in these areas have not been well-characterized. We surveyed 4786 households for evidence of technical, financial, institutional, social, and environmental predictors of rural water service continuity (WSC), defined as the percentage of the year that water is available from a source. Multiple imputed fractional logistic regression models that account for the survey design were used to assess operational risks to WSC for piped supply, tube wells, boreholes, springs, dug wells, and surface water for the rural populations of Bangladesh, Pakistan, Ethiopia, and Mozambique. Multivariable regressions indicate that households using multiple water sources were associated with lower WSC in Bangladesh, Pakistan, and Mozambique. However, the possibility must be considered that households may use more than one water source because services are intermittent. Water scarcity and drought were largely unassociated with WSC, suggesting that service interruptions may not be primarily due to physical water resource constraints. Consistent findings across countries may have broader relevance for meeting established targets for service availability as well as human health.
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Affiliation(s)
- Ryan M. DuChanois
- Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
| | | | - Richard A. Fenner
- Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
| | - Marc Jeuland
- Sanford School of Public Policy, Duke University, Durham, North Carolina 27708, United States
- Duke Global Health Institute, Duke University, Durham, North Carolina 27710, United States
| | - Barbara Evans
- School of Civil Engineering, The University of Leeds, Leeds LS2 9JT, UK
| | - Oliver Cumming
- Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK
- Department of Disease Control, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK
| | - Rashid U. Zaman
- Health Portfolio, Oxford Policy Management, Oxford OX1 3HJ, UK
| | | | - Ian Ross
- Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK
- Department of Global Health and Development, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK
| | - Matthew O. Gribble
- Department of Environmental Health, Emory University Rollins School of Public Health, Atlanta, Georgia 30322, United States
- Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, Georgia 30322, United States
| | - Joe Brown
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30308, United States
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Brown D, Farrow C, McBean EA, Gharabaghi B, Beauchamp J. Advancing performance evaluation standards for household water treatment technologies. JOURNAL OF WATER AND HEALTH 2019; 17:266-273. [PMID: 30942776 DOI: 10.2166/wh.2018.266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Diarrheal illnesses and fatalities continue to be major issues in many regions throughout the world. Household water treatment (HWT) technologies (including both point-of-use (POU) and point-of-entry (POE) treatment solutions) have been shown as able to deliver safe water in many low-income communities. However, as shown herein, there are important inconsistencies in protocols employed for validating performance of HWTs. The WHO does not stipulate influent concentration as a parameter that could influence removal efficacy, nor does it indicate an influent concentration range that should be used during technology evaluations. A correlation between influent concentration and removal is evidenced herein (R2 = 0.88) with higher influent concentrations resulting in higher log-removal values (LRVs). The absence of a recommended standard influent concentration of bacteria (as well as for viruses and protozoa) could have negative consequences in intervention efforts. Recommendations are provided that regulatory bodies should specify an influent concentration range for testing and verification of HWT technologies.
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Affiliation(s)
- D Brown
- School of Engineering, University of Guelph, Guelph, ON, Canada E-mail:
| | - C Farrow
- School of Engineering, University of Guelph, Guelph, ON, Canada E-mail:
| | - E A McBean
- School of Engineering, University of Guelph, Guelph, ON, Canada E-mail:
| | - B Gharabaghi
- School of Engineering, University of Guelph, Guelph, ON, Canada E-mail:
| | - J Beauchamp
- School of Engineering, University of Guelph, Guelph, ON, Canada E-mail:
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Rocha-Melogno L, Yoo R, Broesicke O, Kallergis A, Garcia J, Herbas E, Torrez-Daza A, Johnson A, Boey D, Beard V, Frisbie SH, Murcott S, Brown J. Rapid drinking water safety estimation in cities: Piloting a globally scalable method in Cochabamba, Bolivia. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 654:1132-1145. [PMID: 30841388 DOI: 10.1016/j.scitotenv.2018.11.119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 11/07/2018] [Accepted: 11/08/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Systematically collected and comparable data on drinking water safety at city-scale is currently unavailable, despite the stated importance of water safety monitoring at scale under the United Nations Sustainable Development Goals (SDGs). We developed a rapid drinking water quality assessment methodology intended to be replicable across all cities and useful for monitoring towards achieving SDG 6 (Clean Water and Sanitation). METHODS We collected drinking water samples at the point-of-consumption for basic microbial, physical and chemical water quality analysis and conducted household surveys on drinking water, sanitation, and hygiene access from 80 households in the city of Cochabamba over 1 week. We categorized the household's water service level according to the SDG 6 framework. RESULTS We estimated an average time requirement of 6.4 person-hours and a consumable cost of US $51 per household (n = 80). In this cross-sectional study, 71% of drinking water samples met World Health Organization (WHO) microbiological safety criteria, 96% met WHO chemical quality criteria, and all met WHO aesthetic quality criteria. However, only 18% of the households were categorized as having safely managed drinking water services. None met the criteria for having safely managed sanitation services; nonetheless, 81% had basic sanitation services and 78% had basic hygiene facilities. CONCLUSIONS This method can generate basic water safety data for a city at a relatively low cost in terms of person-time and materials, yielding useful information for inter-city analyses. Because 29% of samples did not meet microbiological safety criteria, 22% of the households did not have access to handwashing facilities and none had safe sanitation services, we concluded that Cochabamba did not meet normative SDG 6 targets when surveyed. Our study further suggests that water quality at point-of-use more accurately characterizes drinking water safety than infrastructure type.
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Affiliation(s)
- Lucas Rocha-Melogno
- Department of Civil and Environmental Engineering, Duke University, Durham, NC, USA
| | - Rebecca Yoo
- School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Osvaldo Broesicke
- School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Achilles Kallergis
- Marron Institute of Urban Management, New York University, New York, NY, USA
| | - José Garcia
- Universidad Católica Boliviana "San Pablo", Cochabamba, Bolivia
| | - Estela Herbas
- Universidad Católica Boliviana "San Pablo", Cochabamba, Bolivia
| | | | - Ann Johnson
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Daniel Boey
- Department of Civil and Environmental Engineering, Duke University, Durham, NC, USA
| | | | - Seth H Frisbie
- Department of Chemistry and Biochemistry, Norwich University, Northfield, VT, USA
| | - Susan Murcott
- D-Lab, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Joe Brown
- School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
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