1
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Ciawi Y, Khoiruddin K. Low-Cost Antibacterial Ceramic Water Filters for Decentralized Water Treatment: Advances and Practical Applications. ACS OMEGA 2024; 9:12457-12477. [PMID: 38524459 PMCID: PMC10955572 DOI: 10.1021/acsomega.3c09311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 02/09/2024] [Accepted: 02/22/2024] [Indexed: 03/26/2024]
Abstract
Access to clean water remains challenging for people living in underdeveloped regions, rural areas, and remote locations. In the absence of centralized water treatment systems, point-of-use (POU) solutions are necessary. Ceramic water filters (CWFs) have emerged as a practical and affordable option for decentralized water treatment. This review focuses on recent advances in antibacterial CWFs, including preparation methods, filtration performance, and applications. The review highlights the significance of preparation techniques, material choices, and additives in determining CWF properties and performance. Despite virus and chemical contaminant removal limitations, ongoing research on nanofillers and antibacterial additives shows promise for enhancing the CWF performance. The cost-effectiveness, ease of production, and low operational requirements of CWF make it a viable solution for decentralized drinking water systems, particularly in resource-limited areas. Studies have demonstrated the efficacy of CWFs in reducing water contaminants, but proper maintenance and user training are crucial to optimal performance.
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Affiliation(s)
- Yenni Ciawi
- Doctoral
Program in Engineering Sciences, Engineering Faculty, Udayana University, Jl. PB Sudirman, Denpasar Bali 80234, Indonesia
| | - Khoiruddin Khoiruddin
- Department
of Chemical Engineering, Faculty of Industrial Technology, Insitut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia
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2
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Chen Q, Zhao K, Li G, Luo J, Li X, Zeng Y, Wang XM. Highly Permeable Polylactic Acid Membrane Grafted with Quaternary Ammonium Salt for Effective and Durable Water Disinfection. ACS APPLIED MATERIALS & INTERFACES 2022; 14:43741-43748. [PMID: 36099237 DOI: 10.1021/acsami.2c11551] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Given the increasing usage of drinking water purifiers, highly permeable membranes with strong antimicrobial functions are desperately desirable for effective and durable water disinfection. Hereby, we prepared such antimicrobial membranes by chemical grafting of quaternary ammonium salt (QAS) molecules, 3-(trimethoxysilyl)propyldimethyloctadecyl ammonium chloride (TPMMC), onto air plasma pretreated biodegradable polylactic acid (PLA) substrates. The high chemical grafting density promoted very strong and positive zeta potential charge of the resulted PLA-QAS membrane, contributing to effective and broad-spectrum antimicrobial efficiencies (>99.99%) against different microbes, including fungi and conventional and drug-resistant bacteria. The solid grafting of QAS molecules produced a durable antimicrobial performance of the PLA-QAS membrane. In addition, the pleated filter (0.45 m2) of PLA-QAS membrane showed outstanding bacteria rejection properties (>99.99%) and excellent washing durability (up to 20 m3 water) even at very high water filtration rates (up to 4 L/min). The disinfection mechanism was clarified that negatively charged bacteria could be rapidly adsorbed to positively charged PLA-QAS spinnings, followed by devastating cell membrane damage to bacterial debris, leaving a clean environment without significant biofilm and biofouling formation.
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Affiliation(s)
- Qingyan Chen
- Shenzhen Angel Drinking Water Industrial Group Corporation, Angel Industrial Park, Baoan District, Shenzhen, Guangdong 518108, China
| | - Kai Zhao
- Shenzhen Angel Drinking Water Industrial Group Corporation, Angel Industrial Park, Baoan District, Shenzhen, Guangdong 518108, China
| | - Guoping Li
- Shenzhen Angel Drinking Water Industrial Group Corporation, Angel Industrial Park, Baoan District, Shenzhen, Guangdong 518108, China
| | - Jiyue Luo
- Shenzhen Angel Drinking Water Industrial Group Corporation, Angel Industrial Park, Baoan District, Shenzhen, Guangdong 518108, China
| | - Xin Li
- Shenzhen Angel Drinking Water Industrial Group Corporation, Angel Industrial Park, Baoan District, Shenzhen, Guangdong 518108, China
| | - Yingjie Zeng
- Shenzhen Angel Drinking Water Industrial Group Corporation, Angel Industrial Park, Baoan District, Shenzhen, Guangdong 518108, China
| | - Xiao-Mao Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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3
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Liang Y, Huang G, Li Y, Yao Y, Xin X, Li X, Yin J, Gao S, Wu Y, Chen X, Feng R. Photocatalytic disinfection for point-of-use water treatment using Ti 3+ self-doping TiO 2 nanoparticle decorated ceramic disk filter. ENVIRONMENTAL RESEARCH 2022; 212:113602. [PMID: 35660568 DOI: 10.1016/j.envres.2022.113602] [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: 03/29/2022] [Revised: 05/26/2022] [Accepted: 05/30/2022] [Indexed: 06/15/2023]
Abstract
The challenge from pathogenic infections still threatens the health and life of people in developing areas. An efficient, low-cost, and abundant-resource disinfection method is desired for supplying safe drinking water. This study aims to develop a novel Ti3+ doping TiO2 nanoparticle decorated ceramic disk filter (Ti3+/TiO2@CDF) for point-of-use (POU) disinfection of drinking water. The production of Ti3+/TiO2@CDF was optimized to maximize disinfection efficiency and flow rate. Under optimal conditions, the log reduction value (LRV) could reach up to 7.18 and the flaw rate was 108 mL/h. The influences of environmental factors were also investigated. Natural or slightly alkaline conditions, low turbidity, and low concentration of humic acid were favorable for the disinfection of Ti3+/TiO2@CDF, while co-existing HCO3- ions and diatomic cations (Ca2+ and Mg2+) exhibited the opposite effect. Furthermore, the practicability and stability of Ti3+/TiO2@CDF was demonstrated. Ti3+/TiO2@CDF showed high disinfection efficiency for E. coli and S. aureus under a range of concentrations. Long-term experiment indicated that Ti3+/TiO2@CDF was stable. The underlying disinfection mechanisms were investigated and concluded as the combination of retention, adsorption, and photocatalytic disinfection. The developed Ti3+/TiO2@CDF can provide an effective and reliable disinfection tool for POU water treatment in remote area.
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Affiliation(s)
- Ying Liang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Guohe Huang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, China-Canada Center for Energy, Environment and Ecology Research, UR-BNU, School of Environment, Beijing Normal University, Beijing, 100875, China.
| | - Yongping Li
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Yao Yao
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Xiaying Xin
- State Key Laboratory of Marine Pollution (SKLMP), and School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong
| | - Xiang Li
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing, 100875, China
| | - Jianan Yin
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Sichen Gao
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Yuwei Wu
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Xiujuan Chen
- Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Renfei Feng
- Canadian Light Source, Saskatoon, Saskatchewan, S7N 2 V3, Canada
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4
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New Low-Cost Ceramic Microfiltration Membranes for Bacteria Removal. MEMBRANES 2022; 12:membranes12050490. [PMID: 35629816 PMCID: PMC9143507 DOI: 10.3390/membranes12050490] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 04/27/2022] [Accepted: 04/28/2022] [Indexed: 11/30/2022]
Abstract
Safe water provision in low-income countries is constrained by limited financial resources, and the problem is worsened during natural disasters. Thus, there is a need to develop efficient low-cost technologies for point-of-use water treatment. This work reports on the development of new ceramic microfiltration membranes made from mixtures of inexpensive raw materials available locally (kaolin, bentonite and limestone) and their efficiency in rejecting bacteria such as Escherichia coli and Staphylococcus aureus. Thermogravimetric analysis, differential scanning calorimetry, Fourier-transform infrared spectroscopy, X-ray diffraction, mercury intrusion porosimetry, flexural strength and water uptake were used to characterize the raw materials and membranes. The addition of limestone in the membrane fabrication increased the pore size, the porosity and, thus, the permeability of the membranes but at the expense of the rejection performance. Among the different compositions studied, the membrane made of 83% kaolin, 10% bentonite and 7% limestone showed the best performance compromise with water permeability of 566 L·h−1·m−2·bar−1 and 100% rejection of both Escherichia coli and Staphylococcus aureus. These new low-cost microfiltration membranes are expected to have potential applications in water treatment and household applications.
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5
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Yue R, An C, Ye Z, Bi H, Chen Z, Liu X, Zhang X, Lee K. Cleanup of oiled shorelines using a dual responsive nanoclay/sodium alginate surface washing agent. ENVIRONMENTAL RESEARCH 2022; 205:112531. [PMID: 34906587 DOI: 10.1016/j.envres.2021.112531] [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: 07/26/2021] [Revised: 11/30/2021] [Accepted: 12/04/2021] [Indexed: 06/14/2023]
Abstract
Oil spills may affect ecosystems and endanger public health. In this study, we developed a novel and dual responsive nanoclay/sodium alginate (NS) washing fluid, and systematically evaluated its application potential in oiled shoreline cleanup. The characterization results demonstrated that sodium alginate combined with nanoclay via hydrogen bonds, and was inserted into the interlayer spacing of nanoclay. Adding sodium alginate reduced surface and interfacial tensions, while increasing the viscoelasticity of the washing fluid. Batch experiments were conducted to investigate oil removal performance under various conditions. Additionally, the factorial design analysis showed that three single factors (temperature, oil concentration, and salinity), and two interactive effects (temperature/salinity; and oil concentration/HA) displayed significant effects on the oil removal efficiency of the NS washing fluid. Compared to the commercial surfactants, the NS composite exhibited satisfactory removal efficiencies for treating oily sand. Green materials-stabilized Pickering emulsion can potentially be used for oil/water separation. The NS washing agent displayed excellent pH- and Ca2+- responsiveness, generating transparent supernatants with low oil concentration and turbidity. Our work opens an interesting avenue for designing economical, high performance, and green washing agents.
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Affiliation(s)
- Rengyu Yue
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada
| | - Chunjiang An
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada.
| | - Zhibin Ye
- Department of Chemical and Materials Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada
| | - Huifang Bi
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada
| | - Zhikun Chen
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada
| | - Xudong Liu
- Department of Chemical and Materials Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada
| | - Ximeng Zhang
- Department of Chemical and Materials Engineering, Concordia University, Montreal, QC, H3G 1M8, Canada
| | - Kenneth Lee
- Ecosystem Science, Fisheries and Oceans Canada, 200 Kent Street, Ottawa, Ontario, K1C 0E6, Canada
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6
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Zhong C, Xiong X. Preparation of a composite coating film via vapor induced phase separation for air purification and real-time bacteria photocatalytic inactivation. PROGRESS IN ORGANIC COATINGS 2021; 161:106486. [PMID: 34511697 PMCID: PMC8415738 DOI: 10.1016/j.porgcoat.2021.106486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 07/27/2021] [Accepted: 08/25/2021] [Indexed: 06/13/2023]
Abstract
Infectious diseases resulted from transmitting of bacteria or virus like COVID-19 via air-borne droplets have brought severe threat to human beings worldwide. Cutting the spreading paths to obtain clean air is one of the promising strategies to prevent people from such dangerous diseases. In this work, we have employed a strategy of spray coating in combination with vapor induced phase separation to prepare a composite coating film to fulfill that purpose. A stable mixture suspension containing micelles of block copolymer of poly(styrene-block-butadiene-block-styrene) and TiO2 nanoparticles was sprayed onto stainless steel mesh to evaporate solvent in non-solvent vapor atmospheres. A water vapor atmosphere and an ethanol vapor atmosphere were in turn employed to improve the mechanical strength of the obtained coating film. The porous microstructure, the porosity, and the superhydrophobicity of the coating film were carefully characterized and analyzed. The air pressure-drop of the coating film was determined to be lower than 100 Pa, indicating a high air permeability. Moreover, a foggy air containing E. coli was pressed through the coating film via a home-made apparatus to simulate the air purification system, where E. coli contained air-borne droplets were intercepted by the film matrix in a physical manner, and the bacteria was photocatalytically inactivated at the meantime. A filtration efficiency of 99.7% and a 99.6% efficiency of real-time photocatalytic inactivation of E. coli demonstrate the promising potential of the coating film.
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Affiliation(s)
- Chengtang Zhong
- Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
| | - Xiaopeng Xiong
- Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China
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7
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Chen Z, An C, Tan Q, Tian X, Li G, Zhou Y. Spatiotemporal analysis of land use pattern and stream water quality in southern Alberta, Canada. JOURNAL OF CONTAMINANT HYDROLOGY 2021; 242:103852. [PMID: 34214919 DOI: 10.1016/j.jconhyd.2021.103852] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/19/2021] [Accepted: 06/23/2021] [Indexed: 05/28/2023]
Abstract
Alberta has over 70% of total irrigated land in Canada and 13 irrigation districts are mainly located along the rivers in southern Alberta. The runoff and irrigation return flow can carry excess nutrients, pesticides, and sediments, which adversely affect the river water quality. In the present study, the comprehensive spatiotemporal analysis of land use pattern and stream water quality in southern Alberta was conducted. The water quality monitoring on the South Saskatchewan River watershed within Alberta showed that most water quality indicators did not significantly change between 2003 and 2017. Land use maps demonstrated significant urban expansion and cropland decline in the study area from 2005 to 2015, while the irrigation area increased. Correlation analysis and redundancy analysis revealed that cropland, built-up land, and native grassland were three land use types that were positively correlated with water quality indicators. Stronger correlations between nitrogen concentration and built-up land were found in dry seasons compared with wet seasons. According to the results of cluster analysis, higher water quality indicator concentrations could be observed in groups with a higher proportion of cropland and built-up land. Significant relationships between land use patterns and water quality were found in this study, which demonstrated that further investigation is needed to identify the sources of water pollutants at a smaller scale.
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Affiliation(s)
- Zhikun Chen
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC H3G 1M8, Canada
| | - Chunjiang An
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC H3G 1M8, Canada.
| | - Qian Tan
- Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Xuelin Tian
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC H3G 1M8, Canada
| | - Gongchen Li
- Alberta Environment and Parks, Edmonton, AB T5K 2J6, Canada
| | - Yang Zhou
- Water Science and Environmental Engineering Research Center, College of Chemical and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
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8
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Vahabisani A, An C. Use of biomass-derived adsorbents for the removal of petroleum pollutants from water: a mini-review. ENVIRONMENTAL SYSTEMS RESEARCH 2021; 10:25. [PMID: 34804763 PMCID: PMC8591771 DOI: 10.1186/s40068-021-00229-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 03/25/2021] [Indexed: 06/01/2023]
Abstract
Over the past decades, a large amount of petroleum pollutants has been released into the environment resulting from various activities related to petrochemicals. The discharge of wastewater with petrochemicals can pose considerable risk of harm to the human health and the environment. The use of adsorbents has received much consideration across the environmental field as an effective approach for organic pollutant removal. There is a particular interest in the use of biomass adsorbent as a promising environmentally-friendly and low-cost option for removing pollutants. In this article, we present a review of biomass-derived adsorbents for the removal of petroleum pollutants from water. The features of different adsorbents such as algae, fungi, and bacteria biomasses are summarized, as is the process of removing oil and PAHs using biomass-derived adsorbents. Finally, recommendations for future study are proposed.
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Affiliation(s)
- Azar Vahabisani
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC H3G 1M8 Canada
| | - Chunjiang An
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC H3G 1M8 Canada
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9
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Yang X, Huang G, An C, Chen X, Shen J, Yin J, Song P, Xu Z, Li Y. Removal of arsenic from water through ceramic filter modified by nano-CeO 2: A cost-effective approach for remote areas. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 750:141510. [PMID: 33182193 DOI: 10.1016/j.scitotenv.2020.141510] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 07/11/2020] [Accepted: 08/03/2020] [Indexed: 06/11/2023]
Abstract
The groundwater with high arsenic concentration is widespread, especially in many remote areas of developing countries. Arsenic existing in drinking water sources has a high risk to human health. In this study, an innovative effort to remove As(V) from water using ceramic filters functionalized with CeO2 nanocomposites (CF-CeO2) was investigated. Considering removal efficiency and flow rate, the suitable coating amount of CeO2 was determined for the production of CF-CeO2. Based on the factorial analysis, influent arsenic concentration and pH were found to be significant factors in As(V) removal. Furthermore, CF-CeO2 exhibited a good removal capability over a wide pH range and was insensitive to the change of background electrolyte concentration. In the treatment of natural water, the existence of medium and low turbidity levels facilitated As(V) removing, while the high turbidity level exhibited the opposite effect. Based on macroscopic experiments and microscopic characterizations, it was revealed that the As(V) removal mechanism by the CF-CeO2 mainly included ion-exchange and electrostatic attraction. The findings in this study provided convincing evidence for the use of CF-CeO2 as a high-efficiency, low-cost, and safe approach for water purification in the remote areas of developing countries.
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Affiliation(s)
- Xiaohan Yang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Guohe Huang
- Center for Energy, Environment and Ecology Research, UR-BNU, School of Environment, Beijing Normal University, Beijing 100875, China.
| | - Chunjiang An
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
| | - Xiujuan Chen
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S 0A2, Canada
| | - Jian Shen
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S 0A2, Canada
| | - Jianan Yin
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S 0A2, Canada
| | - Pei Song
- MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing 102206, China
| | - Ziqing Xu
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Yongping Li
- Center for Energy, Environment and Ecology Research, UR-BNU, School of Environment, Beijing Normal University, Beijing 100875, China
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10
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Bi H, An C, Chen X, Owens E, Lee K. Investigation into the oil removal from sand using a surface washing agent under different environmental conditions. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 275:111232. [PMID: 32829266 DOI: 10.1016/j.jenvman.2020.111232] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 07/19/2020] [Accepted: 08/12/2020] [Indexed: 06/11/2023]
Abstract
Spilled oil frequently reaches the shorelines and affects coastal biota and communities. The application of surface washing agents is an important shoreline cleanup technique that can help remove stranded oil from substrate surfaces with the advantages of high removal efficiency, low toxicity, and strong economic viability. In this study, the investigation into the oil removal from contaminated sand using a surface washing agent under variable environmental conditions was conducted. A preliminary test was conducted to obtain the optimal combination of operating factors of surface washing agent-to-oil ratio (SOR) 2:1, mixing speed 150 rpm, and mixing time 30 min. The results of single-factor experiments showed that high temperature and humic acid concentration of flush water contributed to the performance of a surface washing agent, while salinity and kaolinite concentration could inhibit its performance. The factorial analysis revealed the main effects of temperature and salinity, and the interactive effects of temperature and salinity as well as salinity and humic acid concentration that were significant to the washing efficiency of the surface washing agent. In addition, the comprehensive assessment of a surface washing agent from the aspects of toxicity, detergency, dispersion properties, and field trials was conducted. The results have significant implications for future application of surface washing agents in the shoreline cleanup.
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Affiliation(s)
- Huifang Bi
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, H3G 1M8, Canada
| | - Chunjiang An
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, H3G 1M8, Canada.
| | - Xiujuan Chen
- Institude for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Edward Owens
- Owens Coastal Consultants, Bainbridge Island, WA, 98110, USA
| | - Kenneth Lee
- Fisheries and Oceans Canada, Ecosystem Science, Ottawa, ON, K1A 0E6, Canada
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11
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Xu Z, Huang G, An C, Huang J, Chen X, Xin X, Song P, Feng R, Li Y. Low-cost microbiological purification using a new ceramic disk filter functionalized by chitosan/TiO2 nanocomposites. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116984] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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12
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Zhong Y, Wang R, Wang X, Lin Z, Jiang G, Yang M, Xu D. A Ti-MOF Decorated With a Pt Nanoparticle Cocatalyst for Efficient Photocatalytic H 2 Evolution: A Theoretical Study. Front Chem 2020; 8:660. [PMID: 32850672 PMCID: PMC7427410 DOI: 10.3389/fchem.2020.00660] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 06/25/2020] [Indexed: 12/03/2022] Open
Abstract
Pt nanoparticles (NPs) are often used as cocatalysts to enhance the photocatalytic hydrogen production catalyzed by the metal organic framework (MOF) materials. The catalytic efficiency of many Pt/MOF systems can be greatly improved when Pt NPs are used as cocatalysts. In this work, the Pt/20%-MIL-125-(SCH3)2 was chosen as the template material to understand the functional role of a Pt metal cocatalyst in the catalytic process. Experimentally, the catalytic activity of Pt/20%-MIL-125-(SCH3)2 is more than 100 times that of the system without the help of Pt NPs. Firstly, we proposed a searching algorithm, which is based on the combined Monte Carlo (MC) method and principal component analysis (PCA) algorithm, to find that the most probable adsorption site of the Pt13 nanocluster loaded on the (001) surface of 20%-MIL-125-(SCH3)2. Next, by using density functional theory (DFT) and time-dependent density functional theory (TDDFT) methods, we revealed that the accumulation of some positive charges on the Pt13 cluster and proton adsorbed on the Pt13 cluster, which can promote the separation of photogenerated electrons and holes, thus improving the photocatalytic efficiency. This work not only provides a method to obtain the adsorption configuration of metal clusters on various MOFs but also provides a new insight into increasing photocatalytic efficiency for H2 production in Pt/MOF systems.
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Affiliation(s)
- Yeshuang Zhong
- College of Chemistry, MOE Key Laboratory of Green Chemistry and Technology, Sichuan University, Chengdu, China
| | - Ruihan Wang
- College of Chemistry, MOE Key Laboratory of Green Chemistry and Technology, Sichuan University, Chengdu, China
| | - Xin Wang
- College of Chemistry, MOE Key Laboratory of Green Chemistry and Technology, Sichuan University, Chengdu, China
| | - Zhien Lin
- College of Chemistry, MOE Key Laboratory of Green Chemistry and Technology, Sichuan University, Chengdu, China
| | - Gang Jiang
- Institute of Atomic and Molecular Physics, MOE Key Laboratory of High Energy Density Physics and Technology, Sichuan University, Chengdu, China
| | - Mingli Yang
- Institute of Atomic and Molecular Physics, MOE Key Laboratory of High Energy Density Physics and Technology, Sichuan University, Chengdu, China.,Research Center for Material Genome Engineering, Sichuan University, Chengdu, China
| | - Dingguo Xu
- College of Chemistry, MOE Key Laboratory of Green Chemistry and Technology, Sichuan University, Chengdu, China.,Research Center for Material Genome Engineering, Sichuan University, Chengdu, China
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13
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Goswami KP, Pugazhenthi G. Credibility of polymeric and ceramic membrane filtration in the removal of bacteria and virus from water: A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 268:110583. [PMID: 32383664 DOI: 10.1016/j.jenvman.2020.110583] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 03/27/2020] [Accepted: 04/07/2020] [Indexed: 05/24/2023]
Abstract
The prevalence of many waterborne diseases and the increased mortality rate starting from children to adult persons rises the need to purify water before consumption. Owing to the number of advantages associated with membrane filtration technologies, they are widely being implemented across the world for the production of pathogen free water. This article hence focuses on numerous such examples of using membrane technology in the production of drinking water. Membranes are even being coated with various materials to enhance their surface properties such as electrostatic and hydrophobic attraction capacity to aid for such separation. Various metal oxide coatings are seen to be gaining importance now-a-days and also, articles citing the use of silver coating are very large in number, owing to the excellent antipathogenic property shown by various silver compounds. It needs mention that examples have also been cited in this article where virus concentration was carried out with a purpose of producing different vaccines, virus adsorption in membrane and its subsequent elution (VIRADEL) being the most discussed one. In addition to these, description about the virus and bacteria quantification techniques are also mentioned in this article. The elaborated study of all these processes and the derived future prospects regarding the production of pathogen free water will certainly be helpful for the researchers working in this field, irrespective of the beginners or the experienced ones, to direct their research more innovatively.
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Affiliation(s)
- Kakali Priyam Goswami
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - G Pugazhenthi
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
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14
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Potential of Nanotechnology for Rural Applications. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2020. [DOI: 10.1007/s13369-019-04332-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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15
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Li C, Sun W, Lu Z, Ao X, Li S. Ceramic nanocomposite membranes and membrane fouling: A review. WATER RESEARCH 2020; 175:115674. [PMID: 32200336 DOI: 10.1016/j.watres.2020.115674] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 02/10/2020] [Accepted: 02/27/2020] [Indexed: 05/26/2023]
Abstract
Membrane technologies have broad applications in the removal of contaminants from drinking water and wastewater. In recent decades, ceramic membrane has made rapid progress in industrial/municipal wastewater treatment and drinking water treatment owing to their advantageous properties over conventional polymeric membrane. The beneficial characteristics of ceramic membranes include fouling resistance, high permeability, good recoverability, chemical stability, and long life time, which have found applications with the recent innovations in both fabrication methods and nanotechnology. Therefore, ceramic membranes hold great promise for potential applications in water treatment. This paper mainly reviews the progress in the research and development of ceramic membranes, with key focus on porous ceramic membranes and nanomaterial-functionalized ceramic membranes for nanofiltration or catalysis. The current state of the available ceramic membranes in industry and academia, and their potential advantages, limitations and applications are reviewed. The last section of the review focuses on ceramic membrane fouling and the efforts towards ceramic membrane fouling mitigation. The advances in ceramic membrane technologies have rarely been widely reviewed before, therefore, this review could be served as a guide for the new entrants to the field, as well to the established researchers.
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Affiliation(s)
- Chen Li
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Wenjun Sun
- School of Environment, Tsinghua University, Beijing, 100084, China.
| | - Zedong Lu
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Xiuwei Ao
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Simiao Li
- School of Environment, Tsinghua University, Beijing, 100084, China
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16
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Huang J, Huang G, An C, Xin X, Chen X, Zhao Y, Feng R, Xiong W. Exploring the use of ceramic disk filter coated with Ag/ZnO nanocomposites as an innovative approach for removing Escherichia coli from household drinking water. CHEMOSPHERE 2020; 245:125545. [PMID: 31864067 DOI: 10.1016/j.chemosphere.2019.125545] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/02/2019] [Accepted: 12/03/2019] [Indexed: 06/10/2023]
Abstract
Ceramic water filter is suitable for low-income families and rural communities in developing countries to obtain safe drinking water because of its low cost and good performance. As an innovative effort, the ceramic disk filter coated with Ag/ZnO nanocomposites (AZ-CDF) was proposed in this study. The manufacture of AZ-CDFs was optimized by experiments based on the Box-Behnken design. The results of thermal field emission scanning electron microscopy (TFE-SEM) and very powerful elemental and structural probe employing radiation from a synchrotron (VESPERS) indicated that Ag/ZnO nanocomposites were mainly distributed on the upper surface of AZ-CDF. The antibacterial activity of AZ-CDF was investigated by detecting the variation of cell status and intracellular reactive oxygen species during a period of time using flow cytometry. Both non-photocatalytic and photocatalytic antibacterial activities of Ag/ZnO nanocomposite contributed to the bacterial reduction property of AZ-CDF. During filtration, the initial Escherichia coli (E. coli) concentration and illumination intensity also influenced the E. coli removal performance of AZ-CDF. When the light illumination intensity was 7000 Lux, AZ-CDF was appropriate to treat the water contaminated by E. coli concentration of less than 103 cfu/mL. Increasing illumination intensity resulted in the improvement of E. coli removal performance of AZ-CDF. It was concluded the main mechanisms for the E. coli removal of AZ-CDF were filtration, non-photocatalytic and photocatalytic antibacterial activities.
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Affiliation(s)
- Jing Huang
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada; MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing, 102206, China
| | - Guohe Huang
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada.
| | - Chunjiang An
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, H3G 1M8, Canada
| | - Xiaying Xin
- Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, A1B 3X5, Canada
| | - Xiujuan Chen
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Yanyun Zhao
- MOE Key Laboratory of Resources and Environmental Systems Optimization, North China Electric Power University, Beijing, 102206, China
| | - Renfei Feng
- Canadian Light Source, Saskatoon, Saskatchewan, S7N 2 V3, Canada
| | - Wenhui Xiong
- Stantec Consulting Ltd, Saskatoon, S7K 0K3, Canada
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17
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Taguchi Method and Response Surface Methodology in the Treatment of Highly Contaminated Tannery Wastewater Using Commercial Potassium Ferrate. MATERIALS 2019; 12:ma12223784. [PMID: 31752134 PMCID: PMC6888326 DOI: 10.3390/ma12223784] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 11/14/2019] [Accepted: 11/15/2019] [Indexed: 12/30/2022]
Abstract
The potential implementation of Envifer®, a commercial product containing potassium ferrate (40.1% K2FeO4), for the purification of highly contaminated tannery wastewater from leather dyeing processes was proposed. The employment of the Taguchi method for optimization of experiments allowed the discoloration (98.4%), chemical oxygen demand (77.2%), total organic carbon (75.7%), and suspended solids (96.9%) values to be lowered using 1.200 g/L K2FeO4 at pH 3 within 9 min. The application of the central composite design (CCD) and the response surface methodology (RSM) with the use of 1.400 g/L K2FeO4 at pH 4.5 diminished the discoloration, the chemical oxygen demand, the total organic carbon, and suspended solids within 9 min. The Taguchi method is suitable for the initial implementation, while the RSM is superior for the extended optimization of wastewater treatment processes.
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18
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Yao Y, Wang C, Wang X, Yang Y, Wan Y, Chen J, Ding F, Tang Y, Wang Z, Liu L, Xie J, Gao B, Li YC, Sigua GC. Activation of fulvic acid-like in paper mill effluents using H 2O 2/TiO 2 catalytic oxidation: Characterization and salt stress bioassays. JOURNAL OF HAZARDOUS MATERIALS 2019; 378:120702. [PMID: 31202064 DOI: 10.1016/j.jhazmat.2019.05.095] [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: 12/16/2018] [Revised: 04/15/2019] [Accepted: 05/28/2019] [Indexed: 06/09/2023]
Abstract
Increasing environmental concerns about organic waste in paper mill effluents demand alternative wastewater management technology. We reported novel activation of fulvic acid-like in paper mill effluents using hydrogen peroxide (H2O2) as oxidizer and titanium oxide (TiO2) as catalyst. Spectroscopic characteristics of fulvic acid-like in paper mill effluents before and after activation (PFA and PFA-Os, respectively) were compared with a benchmark fulvic acid extracted from leonardite (LFA). Results indicated that PFA-Os exhibited less lignin structures, more functional groups and lower molecular weight than PFA, sharing much similarity with LFA. Among PFA-Os with varying degrees of oxidation, PFA-O-3 activated with 1:2 vol ratio of paper mill effluent and 30% H2O2 for 20 min digestion at 90 °C stands out to be the optimal for further examination of its biological activity. Bioassays with rice seed/seedling indicated that applications of LFA at 2-5 mg-C/L and PFA-O-3 at 60-100 mg-C/L significantly increased rice seed germination rate and seedling growth under salt stress imposed with 100 mM NaCl. The mechanism was mainly through reduced oxidative damage via activation of antioxidative enzymes and lipid peroxidation. This study provides the needed technical basis of safer and cleaner technologies for innovative management of paper mill effluents.
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Affiliation(s)
- Yuanyuan Yao
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - Chun Wang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - Xiaoqi Wang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - Yuechao Yang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China.
| | - Yongshan Wan
- Department of Soil and Water Science, Tropical Research and Education Center, IFAS, University of Florida, Homestead, FL, 33031, USA
| | - Jianqiu Chen
- State Key Laboratory of Nutrition Resources Integrated Utilization, Kinggenta Ecological Engineering Group Co., Ltd, Linshu, Shandong, 276700, China
| | - Fangjun Ding
- Key Laboratory of Humic Acid Fertilizer of Ministry of Agriculture, Shandong Agricultural University Fertilizer Technology Co. Ltd, Feicheng, Shandong, 271600, China
| | - Yafu Tang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - Zhonghua Wang
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - Lu Liu
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - JiaZhuo Xie
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong, 271018, China
| | - Bin Gao
- Department of Agricultural and Biological Engineering, IFAS, University of Florida, Gainesville, FL, 32611, USA
| | - Yuncong C Li
- Department of Soil and Water Science, Tropical Research and Education Center, IFAS, University of Florida, Homestead, FL, 33031, USA
| | - Gilbert C Sigua
- United States Department of Agriculture-Agricultural Research Service, Florence, SC, 29501, USA
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19
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Song P, Huang G, An C, Zhang P, Chen X, Ren S. Performance analysis and life cycle greenhouse gas emission assessment of an integrated gravitational-flow wastewater treatment system for rural areas. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:25883-25897. [PMID: 31273662 DOI: 10.1007/s11356-019-05746-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 06/12/2019] [Indexed: 06/09/2023]
Abstract
Due to the lack of appropriate wastewater treatment facility in rural areas, the discharging of wastewater without sufficient treatment results in many environmental issues and negative impact on the local economy. In this study, a novel integrated gravitational-flow wastewater treatment system (IGWTS) for treating domestic wastewater in rural areas was developed and evaluated. As the core module of IGWTS, the multi-soil-layering (MSL) system showed good performances for removing organic matters and nutrients in lab-scale experiments. Aeration was found to be the dominant positive factor for contaminant removal in factorial analysis, while bottom submersion had the most negative effect. Based on the critical operational factors obtained from lab-scale tests, the full-scale IGWTS consisting of multifunctional anaerobic tank (MFAT), MSL, and subsurface flow constructed wetland (SFCW) was designed, constructed, and operated successfully in the field application. The final effluent concentrations of COD, BOD5, TP, NH3-N, and TN reached 22.0, 8.0, 0.3, 4.0, and 11.0 mg/L, with removal rates of 92, 93, 92, 86, and 76%, respectively. The feasibility of IGWTS was also quantitatively evaluated from the perspectives of resource consumption, economic costs, water environment impact, and life cycle greenhouse gas (GHG) emissions. IGWTS has been proved to be a sound approach to mitigate GHG emissions compared with centralized wastewater treatment plant. It can also be featured as an eco-friendly technology to improve rural water environment, and an economic scenario with low construction and operation costs. Graphical abstract.
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Affiliation(s)
- Pei Song
- MOE Key Laboratory of Resourcces and Environmental Systems Optimization, North China Electric Power University, Beijing, 102206, China
| | - Guohe Huang
- Center for Energy, Environment and Ecology Research, UR-BNU, Beijing Normal University, Beijing, 100875, China.
| | - Chunjiang An
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Quebec, H3G 1M8, Canada
| | - Peng Zhang
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Xiujuan Chen
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, S4S 0A2, Canada
| | - Shan Ren
- MOE Key Laboratory of Resourcces and Environmental Systems Optimization, North China Electric Power University, Beijing, 102206, China
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20
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Chen X, Huang G, An C, Feng R, Wu Y, Huang C. Plasma-induced PAA-ZnO coated PVDF membrane for oily wastewater treatment: Preparation, optimization, and characterization through Taguchi OA design and synchrotron-based X-ray analysis. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2019.03.091] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Wang Z, Liang K, Chan SW, Tang Y. Fabrication of nano CuAl 2O 4 spinel for copper stabilization and antibacterial application. JOURNAL OF HAZARDOUS MATERIALS 2019; 371:550-557. [PMID: 30878905 DOI: 10.1016/j.jhazmat.2019.02.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 02/12/2019] [Accepted: 02/13/2019] [Indexed: 06/09/2023]
Abstract
With widely reported antibacterial potential, the copper-containing nanoparticles have become attractive antibacterial agents to prohibit the undesirable bacterial adhesion and growth. However, after applying the copper-containing agents in the environment, the potential leaching and bioaccumulation of copper ions may cause severe environmental contamination and irreversible health problems. Therefore, the nano CuAl2O4 spinel was fabricated as a novel copper-stabilized antibacterial agent with much minimized copper leachability. Results show the successful fabrication of nano CuAl2O4 spinel as well-shaped polyhedral particles with maximum length of ˜100 nm and width of ˜50 nm. The optimal parameters for the synthesis of CuAl2O4 include pH value of 11.0, sintering temperature of 1000 °C, dwelling time of 3 h, and the heating rate of 5 °C/min. The leaching test also confirmed the superiority of the nano CuAl2O4 in copper stabilization. The beneficial antibacterial activity of the nano CuAl2O4 was further testified by an obvious decrease in the amount of Escherichia coli in a medium with addition of the CuAl2O4 spinel. Besides the growth mechanisms of the nano-particles, this work has also innovatively demonstrated a strategy to replace the traditional antibacterial agents by a novel, long-lasting nano CuAl2O4 with little copper leachability.
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Affiliation(s)
- Ziyi Wang
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Kun Liang
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Siu-Wai Chan
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, 10027, USA
| | - Yuanyuan Tang
- State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
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22
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Reddy KR, Reddy CV, Nadagouda MN, Shetti NP, Jaesool S, Aminabhavi TM. Polymeric graphitic carbon nitride (g-C 3N 4)-based semiconducting nanostructured materials: Synthesis methods, properties and photocatalytic applications. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 238:25-40. [PMID: 30844543 DOI: 10.1016/j.jenvman.2019.02.075] [Citation(s) in RCA: 138] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 02/12/2019] [Accepted: 02/16/2019] [Indexed: 05/06/2023]
Abstract
In recent years, various facile and low-cost methods have been developed for the synthesis of advanced nanostructured photocatalytic materials. These catalysts are required to mitigate the energy crisis, environmental deterioration, including water and air pollution. Among the various semiconductors explored, recently novel classes of polymeric graphitic carbon nitride (g-C3N4)-based heterogeneous photocatalysts have established much greater importance because of their unique physiochemical properties, large surface area, low price, and long service life, ease of synthesis, product scalability, controllable band gap properties, low toxicity, and high photocatalytic activity. The present comprehensive review focuses on recent achievements in a number of facile chemical synthesis methods for semiconducting polymeric carbon nitrides and their heterogeneous nanohybrids with various dopants, nanostructured metals, metal oxides, and nanocarbons, as well as the parameters influencing their physiochemical properties and photocatalytic efficiency, which are discussed with reference to various catalytic applications such as air (NOx) purification, wastewater treatment, hydrogen generation, CO2 reduction, and chemical transformation. The mechanisms for the superior photocatalytic activity of polymeric g-C3N4-based heterogeneous photocatalysts are also discussed. Finally, the challenges, prospects, and future directions for photocatalytic polymeric g-C3N4-based semiconducting materials are described.
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Affiliation(s)
- Kakarla Raghava Reddy
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Ch Venkata Reddy
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712-749, South Korea
| | - Mallikarjuna N Nadagouda
- Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45324, United States
| | - Nagaraj P Shetti
- Department of Chemistry, K. L. E. Institute of Technology, Gokul, Hubballi, 580030, Affiliated to Visvesvaraya Technological University, Karnataka, India
| | - Shim Jaesool
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 712-749, South Korea.
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Reuna S, Väisänen A. Optimizing the H 3PO 4 leaching conditions of post-precipitated sewage sludge using response surface methodology. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 226:70-75. [PMID: 30114574 DOI: 10.1016/j.jenvman.2018.08.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 06/29/2018] [Accepted: 08/01/2018] [Indexed: 06/08/2023]
Abstract
The leaching procedure of post-precipitated aluminium phosphate sludge with dilute phosphoric acid was developed. The leaching offers a route to recover both critical phosphorous from sewage sludge and the metal used in precipitation. Using phosphoric acid as leaching solution makes it possible to continue the recovery process without the need to remove chloride or sulfate anions. The optimization of the leaching was based on experimental three-level-four-variable central composite face-centered design. The four variables included were acid concentration, volume of acid, temperature and time of leaching. The leaching was conducted for dewatered and water-containing sludge (total solid content 3-4%) and for both second-order regression models were obtained. For water-containing sludge optimal conditions for leaching are solid to liquid ratio (S/L) 400 gL-1, a temperature of 60 °C and a leaching time of 6 h. For the dewatered sludge, optimal leaching is attained when S/L ratio 119 gL-1 with 2 M acid is used at a temperature of 20 °C. The obtained results enable the developing of full-scale process where phosphate in the sludge is refined to phosphorous acid and metal used in sludge production recycled back to precipitation.
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Affiliation(s)
- Sini Reuna
- Department of Chemistry, Renewable Natural Resources and Chemistry of Living Environment, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland.
| | - Ari Väisänen
- Department of Chemistry, Renewable Natural Resources and Chemistry of Living Environment, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland
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Shalaby T, Hamad H, Ibrahim E, Mahmoud O, Al-Oufy A. Electrospun nanofibers hybrid composites membranes for highly efficient antibacterial activity. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 162:354-364. [PMID: 30007185 DOI: 10.1016/j.ecoenv.2018.07.016] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 07/01/2018] [Accepted: 07/03/2018] [Indexed: 05/27/2023]
Abstract
Safety of drinking-water is an urgent for human health. It is critical to promote the cheap technologies for water purification to guarantee the free-pathogens-drinking water. The present study has been investigated the antibacterial activity of polyacrylonitrile (PAN) nanofibers membranes which decorated by Ag, CuO or ZnO nanoparticles as bactericides. The hybrid nanofiber composites were fabricated by electrospinning technique and the obtained membranes were characterized using SEM, EDX and FTIR. Their antibacterial activity was evaluated against E. coli and S. aureus. The data was revealed that the functionalization was successfully obtained by the incorporation of nanoparticles as an additive into the polymer solution which associated many superior properties. Continuous PAN membrane fibers with average diameters from 170 to 250 nm without any beads of plain and its hybrid membrane composites were obtained. The antimicrobial activity was estimated using both disk diffusion tests and growth kinetic models. The antibacterial activity was improved as the concentrations of nanoparticles enhanced. This study provided the real solution for production and inactivation of bacteria which related to the impregnated the PAN nanofibers membrane with Ag, CuO or ZnO NPs. The results have significant implications for finding a safe and an inexpensive path to solve the problems of drinking water, especially in the developing countries.
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Affiliation(s)
- Thanaa Shalaby
- Medical Biophysics Department, Medical Research Institute, Alexandria University, Alexandria, Egypt.
| | - Hesham Hamad
- Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technology Applications (SRTA-City), Alexandria 21934, Egypt.
| | - Ebtihag Ibrahim
- Medical Biophysics Department, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Ola Mahmoud
- Microbiology Department, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Affaf Al-Oufy
- Textile Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
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