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Zhang Z, Huang Z, Li H, Wang D, Yao Y, Dong K. Impact of Nitrate on the Removal of Pollutants from Water in Reducing Gas-Based Membrane Biofilm Reactors: A Review. MEMBRANES 2024; 14:109. [PMID: 38786943 PMCID: PMC11123063 DOI: 10.3390/membranes14050109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2024] [Revised: 04/11/2024] [Accepted: 05/07/2024] [Indexed: 05/25/2024]
Abstract
The membrane biofilm reactor (MBfR) is a novel wastewater treatment technology, garnering attention due to its high gas utilization rate and effective pollutant removal capability. This paper outlines the working mechanism, advantages, and disadvantages of MBfR, and the denitrification pathways, assessing the efficacy of MBfR in removing oxidized pollutants (sulfate (SO4-), perchlorate (ClO4-)), heavy metal ions (chromates (Cr(VI)), selenates (Se(VI))), and organic pollutants (tetracycline (TC), p-chloronitrobenzene (p-CNB)), and delves into the role of related microorganisms. Specifically, through the addition of nitrates (NO3-), this paper analyzes its impact on the removal efficiency of other pollutants and explores the changes in microbial communities. The results of the study show that NO3- inhibits the removal of other pollutants (oxidizing pollutants, heavy metal ions and organic pollutants), etc., in the simultaneous removal of multiple pollutants by MBfR.
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Affiliation(s)
- Zhiheng Zhang
- College of Environmental Science and Engineering, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China; (Z.Z.); (Z.H.); (H.L.); (D.W.)
- Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
- Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541006, China
| | - Zhian Huang
- College of Environmental Science and Engineering, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China; (Z.Z.); (Z.H.); (H.L.); (D.W.)
- Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
- Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541006, China
| | - Haixiang Li
- College of Environmental Science and Engineering, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China; (Z.Z.); (Z.H.); (H.L.); (D.W.)
- Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
- Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541006, China
| | - Dunqiu Wang
- College of Environmental Science and Engineering, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China; (Z.Z.); (Z.H.); (H.L.); (D.W.)
- Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
- Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541006, China
| | - Yi Yao
- College of Environmental Science and Engineering, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China; (Z.Z.); (Z.H.); (H.L.); (D.W.)
- Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
- Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541006, China
| | - Kun Dong
- College of Environmental Science and Engineering, Guilin University of Technology, 319 Yanshan Street, Guilin 541006, China; (Z.Z.); (Z.H.); (H.L.); (D.W.)
- Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin 541006, China
- Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin 541006, China
- Guangxi Engineering Research Center of Comprehensive Treatment for Agricultural Non-Point Source Pollution, Guilin 541006, China
- Modern Industry College of Ecology and Environmental Protection, Guilin University of Technology, Guilin 541006, China
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2
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Bounaga A, Alsanea A, Danouche M, Rittmann BE, Zhou C, Boulif R, Zeroual Y, Benhida R, Lyamlouli K. Elemental sulfur biorecovery from phosphogypsum using oxygen-membrane biofilm reactor: Bioreactor parameters optimization, metagenomic analysis and metabolic prediction of the biofilm activity. BIORESOURCE TECHNOLOGY 2024; 400:130680. [PMID: 38593965 DOI: 10.1016/j.biortech.2024.130680] [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: 02/02/2024] [Revised: 04/06/2024] [Accepted: 04/06/2024] [Indexed: 04/11/2024]
Abstract
This work investigated elemental sulfur (S0) biorecovery from Phosphogypsum (PG) using sulfur-oxidizing bacteria in an O2-based membrane biofilm reactor (MBfR). The system was first optimized using synthetic sulfide medium (SSM) as influent, then switched to biogenic sulfide medium (BSM) generated by biological reduction of PG alkaline leachate. The results using SSM had high sulfide-oxidation efficiency (98 %), sulfide to S0 conversion (∼90 %), and S0 production rate up to 2.7 g S0/(m2.d), when the O2/S ratio was ∼0.5 g O2/g S. With the BSM influent, the system maintained high sulfide-to-S0 conversion rate (97 %), and S0-production rate of 1.6 g S0/(m2.d). Metagenomic analysis revealed that Thauera was the dominant genus in SSM and BSM biofilms. Furthermore, influent composition affected the bacterial community structure and abundances of functional microbial sulfur genes, modifying the sulfur-transformation pathways in the biofilms. Overall, this work shows promise for O2-MBfR usage in S0 biorecovery from PG-leachate and other sulfidogenic effluents.
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Affiliation(s)
- Ayoub Bounaga
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University, Benguerir 43150, Morocco; Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, AZ 85287-5701, USA
| | - Anwar Alsanea
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, AZ 85287-5701, USA
| | - Mohammed Danouche
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University, Benguerir 43150, Morocco
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, AZ 85287-5701, USA
| | - Chen Zhou
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, AZ 85287-5701, USA
| | - Rachid Boulif
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University, Benguerir 43150, Morocco
| | - Youssef Zeroual
- Situation Innovation, OCP Group, BP 118, Jorf Lasfar El Jadida, 24000, Morocco
| | - Rachid Benhida
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University, Benguerir 43150, Morocco; Institute of Chemistry, Nice UMR7272, Côte d'Azur University, French National Centre for Scientific Research (CNRS), Nice, France
| | - Karim Lyamlouli
- College of Sustainable Agriculture and Environmental Sciences, Agrobioscience Program, Mohammed VI Polytechnic University, Benguerir 43150, Morocco.
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Awasthi MK, Amobonye A, Bhagwat P, Ashokkumar V, Gowd SC, Dregulo AM, Rajendran K, Flora G, Kumar V, Pillai S, Zhang Z, Sindhu R, Taherzadeh MJ. Biochemical engineering for elemental sulfur from flue gases through multi-enzymatic based approaches - A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 914:169857. [PMID: 38190912 DOI: 10.1016/j.scitotenv.2023.169857] [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: 09/04/2023] [Revised: 12/30/2023] [Accepted: 12/31/2023] [Indexed: 01/10/2024]
Abstract
Flue gases are the gases which are produced from industries related to chemical manufacturing, petrol refineries, power plants and ore processing plants. Along with other pollutants, sulfur present in the flue gas is detrimental to the environment. Therefore, environmentalists are concerned about its removal and recovery of resources from flue gases due to its activation ability in the atmosphere to transform into toxic substances. This review is aimed at a critical assessment of the techniques developed for resource recovery from flue gases. The manuscript discusses various bioreactors used in resource recovery such as hollow fibre membrane reactor, rotating biological contractor, sequential batch reactor, fluidized bed reactor, entrapped cell bioreactor and hybrid reactors. In conclusion, this manuscript provides a comprehensive analysis of the potential of thermotolerant and thermophilic microbes in sulfur removal. Additionally, it evaluates the efficacy of a multi-enzyme engineered bioreactor in this process. Furthermore, the study introduces a groundbreaking sustainable model for elemental sulfur recovery, offering promising prospects for environmentally-friendly and economically viable sulfur removal techniques in various industrial applications.
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Affiliation(s)
- Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China.
| | - Ayodeji Amobonye
- Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, P O Box 1334, Durban 4000, South Africa
| | - Prashant Bhagwat
- Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, P O Box 1334, Durban 4000, South Africa
| | - Veeramuthu Ashokkumar
- Center for Waste Management and Renewable Energy, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai 600077, India
| | - Sarath C Gowd
- Department of Environmental Science and Engineering, School of Engineering and Sciences, SRM University, Andhra Pradesh, India
| | - Andrei Mikhailovich Dregulo
- National Research University "Higher School of Economics", 17 Promyshlennaya str, 198095, Saint-Petersburg, Russia
| | - Karthik Rajendran
- Department of Environmental Science and Engineering, School of Engineering and Sciences, SRM University, Andhra Pradesh, India
| | - G Flora
- Department of Botany, St. Mary's College (Autonomous), Tamil Nadu, India
| | - Vinay Kumar
- Bioconversion and Tissue Engineering (BITE) Laboratory, Department of Community Medicine, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, Thandalam-602105, India
| | - Santhosh Pillai
- Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, P O Box 1334, Durban 4000, South Africa
| | - Zengqiang Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China
| | - Raveendran Sindhu
- Department of Food Technology, TKM Institute of Technology, Kollam 691 505, Kerala, India
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Ma WJ, Zhang HM, Tian Y. Rapid start-up sulfur-driven autotrophic denitrification granular process: Extracellular electron transfer pathways and microbial community evolution. BIORESOURCE TECHNOLOGY 2024; 395:130331. [PMID: 38224786 DOI: 10.1016/j.biortech.2024.130331] [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: 01/01/2024] [Accepted: 01/12/2024] [Indexed: 01/17/2024]
Abstract
Sulfur-driven autotrophic denitrification (SAD) granular process has significant advantages in treating low-carbon/nitrogen wastewater; however, the slow growth rate of sulfur-oxidizing bacteria (SOB) results in a prolonged start-up duration. In this study, the thiosulfate-driven autotrophic denitrification (TAD) was successfully initiated by inoculating anaerobic granular sludge on Day 7. Additionally, the electron donor was successfully transferred to the cheaper elemental sulfur from Day 32 to Day 54 at the nitrogen loading rate of 176.2 g N m-3 d-1. During long term experiment, the granules maintained compact structures with the α-helix/(β-sheet + random coil) of 29.5-40.1 %. Extracellular electron transfer (EET) pathway shifted from indirect to direct when electron donors were switched thiosulfate to elemental sulfur. Microbial analysis suggested that thiosulfate improved EET involving enzymes activity. Thiobacillus and Sulfurimonas were dominant in TAD, whereas Longilinea was enriched in elemental sulfur-driven autotrophic denitrification. Overall, this strategy achieved in-situ enrichment of SOB in granules, thereby shortening start-up process.
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Affiliation(s)
- Wen-Jie Ma
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, MOE), School of Environmental Science and Technology, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, PR China
| | - Han-Min Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, MOE), School of Environmental Science and Technology, Dalian University of Technology, No. 2 Linggong Road, Dalian 116024, PR China.
| | - Yu Tian
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
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Schwarz A, Aybar M, Suárez J, Rittmann B. A steady-state pH-control model for the biological production of elemental sulfur from sulfate in mining-influenced water. WATER RESEARCH 2024; 250:121067. [PMID: 38150861 DOI: 10.1016/j.watres.2023.121067] [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: 07/28/2023] [Revised: 10/11/2023] [Accepted: 12/23/2023] [Indexed: 12/29/2023]
Abstract
We developed a model to predict pH, alkalinity, and the Langelier Saturation Index (LSI) in coupled systems of hydrogen-based autotrophic sulfate reduction and aerobic oxidation of sulfide to elemental sulfur. To neutralize the biologically generated base, the model allows for the addition of CO2 as part of the gas mixture, the independent addition of HCl or CO2, or a combination of the alternatives. The model was evaluated against the results from a laboratory system for the production of elemental sulfur from sulfate present in mine-tailings water, which is characterized by the presence of elevated sulfate and calcium concentrations. Model results were consistent with measurements of pH, alkalinity, and LSI. The model showed how the acid demands of the coupled reactors vary with pH, being approximately equivalent at pH over 8, when ionized sulfide predominates. Also, while the sulfidogenic reactor was well buffered due to the production of ionized sulfide, the sulfidotrophic reactor in the absence of sulfide and carbonate alkalinity was prone to pH declines. Considering that both reactors operated in the positive range of LSI, the model also indicated that addition of CO2 should be minimized due to increase in the bicarbonate concentration and its effect on increasing the LSI. Furthermore, the model also showed that exclusive reliance on HCl for pH control can be incompatible with Cl- effluent standards, which means that a compromise must be reached between CO2 and HCl additions.
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Affiliation(s)
- Alex Schwarz
- Civil Engineering Department, Universidad de Concepción, P.O. Box 160-C, Concepción 4070386, Chile.
| | - Marcelo Aybar
- Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Lientur 1457, Concepción 4080871, Chile
| | - José Suárez
- Civil Engineering Department, Universidad de Concepción, P.O. Box 160-C, Concepción 4070386, Chile
| | - Bruce Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Biodesign Institute, Arizona State University, P.O. Box 875701, Tempe, AZ 85287-5701, USA
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Wang H, Yang J, Zhang H, Zhao J, Liu H, Wang J, Li G, Liang H. Membrane-based technology in water and resources recovery from the perspective of water social circulation: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 908:168277. [PMID: 37939956 DOI: 10.1016/j.scitotenv.2023.168277] [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: 08/31/2023] [Revised: 10/18/2023] [Accepted: 10/31/2023] [Indexed: 11/10/2023]
Abstract
In this review, the application of membrane-based technology in water social circulation was summarized. Water social circulation encompassed the entire process from the acquirement to discharge of water from natural environment for human living and development. The focus of this review was primarily on the membrane-based technology in recovery of water and other valuable resources such as mineral ions, nitrogen and phosphorus. The main text was divided into four main sections according to water flow in the social circulation: drinking water treatment, agricultural utilization, industrial waste recycling, and urban wastewater reuse. In drinking water treatment, the acquirement of water resources was of the most importance. Pressure-driven membranes, such as ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) were considered suitable in natural surface water treatment. Additionally, electrodialysis (ED) and membrane capacitive deionization (MCDI) were also effective in brackish water desalination. Agriculture required abundant water with relative low quality for irrigation. Therefore, the recovery of water from other stages of the social circulation has become a reasonable solution. Membrane bioreactor (MBR) was a typical technique attributed to low-toxicity effluent. In industrial waste reuse, the osmosis membranes (FO and PRO) were utilized due to the complex physical and chemical properties of industrial wastewater. Especially, membrane distillation (MD) might be promising when the wastewater was preheated. Resources recovery in urban wastewater was mainly divided into recovery of bioenergy (via anaerobic membrane bioreactors, AnMBR), nitrogen (utilizing MD and gas-permeable membrane), and phosphorus (through MBR with chemical precipitation). Furthermore, hybrid/integrated systems with membranes as the core component enhanced their performance and long-term working ability in utilization. Generally, concentrate management and energy consumption control might be the key areas for future advancements of membrane-based technology.
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Affiliation(s)
- Hesong Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Jiaxuan Yang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Han Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Jing Zhao
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Hongzhi Liu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Jinlong Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Guibai Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
| | - Heng Liang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
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Alsanea A, Bounaga A, Danouche M, Lyamlouli K, Zeroual Y, Boulif R, Zhou C, Rittmann B. Optimizing Autotrophic Sulfide Oxidation in the Oxygen-Based Membrane Biofilm Reactor to Recover Elemental Sulfur. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:21736-21743. [PMID: 38085930 DOI: 10.1021/acs.est.3c05785] [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: 12/27/2023]
Abstract
Biological sulfide oxidation is an efficient means to recover elemental sulfur (S0) as a valuable resource from sulfide-bearing wastewater. This work evaluated the autotrophic sulfide oxidation to S0 in the O2-based membrane biofilm reactor (O2-MBfR). High recovery of S0 (80-90% of influent S) and high sulfide oxidation (∼100%) were simultaneously achieved when the ratio of O2-delivery capacity to sulfide-to S0 surface loading (SL) (O2/S2- → S0 ratio) was around 1.5 (g O2/m2-day/g O2/m2-day). On average, most of the produced S0 was recovered in the MBfR effluent, although the biofilm could be a source or sink for S0. Shallow metagenomic analysis of the biofilm showed that the top sulfide-oxidizing genera present in all stages were Thauera, Thiomonas, Thauera_A, and Pseudomonas. Thiomonas or Pseudomonas was the most important genus in stages that produced almost only S0 (i.e., the O2/S2- → S0 ratio around 1.5 g of the O2/m2-day/g O2/m2-day). With a lower sulfide SL, the S0-producing genes were sqr and fccAB in Thiomonas. With a higher sulfide SL, the S0-producing genes were in the soxABDXYZ system in Pseudomonas. Thus, the biofilm community of the O2-MBfR adapted to different sulfide-to-S0 SLs and corresponding O2-delivery capacities. The results illustrate the potential for S0 recovery using the O2-MBfR.
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Affiliation(s)
- Anwar Alsanea
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, Arizona 85287-5701, United States
| | - Ayoub Bounaga
- Chemical & Biochemical Sciences Department, Mohammed VI Polytechnic University, Benguerir 43150, Morocco
| | - Mohammed Danouche
- Chemical & Biochemical Sciences Department, Mohammed VI Polytechnic University, Benguerir 43150, Morocco
| | - Karim Lyamlouli
- College of Sustainable Agriculture and Environmental Sciences, Agrobioscience Program, Mohammed VI Polytechnic University, Benguerir 43150, Morocco
| | - Youssef Zeroual
- Situation Innovation, OCP Group, BP 118, Jorf Lasfar, El Jadida 24000, Morocco
| | - Rachid Boulif
- Chemical & Biochemical Sciences Department, Mohammed VI Polytechnic University, Benguerir 43150, Morocco
| | - Chen Zhou
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, Arizona 85287-5701, United States
| | - Bruce Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, Arizona 85287-5701, United States
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Cruces M, Suárez J, Nancucheo I, Schwarz A. Optimization of the chemolithotrophic denitrification of ion exchange concentrate using hydrogen-based membrane biofilm reactors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 348:119283. [PMID: 37839208 DOI: 10.1016/j.jenvman.2023.119283] [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: 07/17/2023] [Revised: 10/02/2023] [Accepted: 10/06/2023] [Indexed: 10/17/2023]
Abstract
A H2-based membrane biofilm reactor (MBfR) was used to remove nitrate from a synthetic ion-exchange brine made up of 23.8 g L-1 NaCl. To aid the selection of the best nitrate management strategy, our research was based on the integrated analysis of ionic exchange and MBfR processes, including a detailed cost analysis. The nitrate removal flux was not affected if key nutrients were present in the feed solution including potassium and sodium bicarbonate. Operating pH was maintained between 7 and 8. By using a H2 pressure of 15 psi, a hydraulic retention time (HRT) of 4 h, and a surface loading rate of 13.6 ± 0.2 g N m-2 d-1, the average nitrate removal flux was 3.3 ± 0.6 g N m-2 d-1. At HRTs of up to 24 h, the system was able to maintain a removal flux of 1.6 ± 0.2 g N m-2 d-1. Microbial diversity analysis showed that the consortium was dominated by the genera Sulfurimonas and Marinobacter. The estimated cost for a 200 m3/h capacity, coupled ion exchange (IX) + MBfR treatment plant is 0.43 USD/m3. This is a sustainable and competitive alternative to an IX-only plant for the same flowrate. The proposed treatment option allows for brine recycling and reduces costs by 55% by avoiding brine disposal expenses.
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Affiliation(s)
- Matias Cruces
- Departamento de Ingeniería Civil, Universidad de Concepción, P.O. Box 160-C, Concepción, 4070386, Chile
| | - José Suárez
- Departamento de Ingeniería Civil, Universidad de Concepción, P.O. Box 160-C, Concepción, 4070386, Chile
| | - Iván Nancucheo
- Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Lientur 1457, Concepción, 4080871, Chile
| | - Alex Schwarz
- Departamento de Ingeniería Civil, Universidad de Concepción, P.O. Box 160-C, Concepción, 4070386, Chile.
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9
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Bounaga A, Alsanea A, Danouche M, Rittmann BE, Zhou C, Boulif R, Zeroual Y, Benhida R, Lyamlouli K. Effect of alkaline leaching of phosphogypsum on sulfate reduction activity and bacterial community composition using different sources of anaerobic microbial inoculum. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 904:166296. [PMID: 37591387 DOI: 10.1016/j.scitotenv.2023.166296] [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: 05/11/2023] [Revised: 07/17/2023] [Accepted: 08/12/2023] [Indexed: 08/19/2023]
Abstract
Phosphogypsum (PG), a by-product of the phosphate industry, is high in sulfate, (SO42-), which makes it an excellent substrate for sulfate-reducing bacteria (SRB) to produce hydrogen sulfide. This work aimed to optimize SO42- leaching from PG to achieve a high biological reduction of SO42- and generate high sulfide concentrations for subsequent use in the biological recovery of elemental sulfur. Five SRB consortia were isolated and enriched from: IS (Industrial sludges), MS (Marine sediments), WC (Winogradsky column), SNV (petroleum industry sediments) and PG (stored Phosphogypsum). The five consortia showed reduction activity when using PG leachate (with water) as source of SO42- and lactate, acetate, or glucose as the electron donor. The highest reduction rate (81.5 %) was registered using lactate and the IS consortium (81.5 %) followed by MS (79 %) and PG (71 %). To enhance the concentration of leached SO42- from PG for future utilization with the isolated consortia, PG was treated with NaOH solutions (2 % and 5 %). SO42- release of 97 % was achieved with a 5 % concentration and the resulting leachate was further diluted to target a SO42- concentration of 12.4 g·L-1 for utilization with the isolated consortia. Compared to water leachate, a significantly higher reduction rate was registered (2 g·L-1 of SO42) using the IS consortium, demonstrating limited inhibition effect of sulfide- concentration on SRB functionalities. Moreover, metagenomic analysis of the consortia revealed that using PG as a source of SO42- increased the abundance of Deltaproteobacteria, including known SRB like Desulfovibrio, Desulfomicrobium, and Desulfosporosinus, as well as novel SRB genera (Cupidesulfovibrio, Desulfocurvus, Desulfococcus) that showed, for the first time, significant potential as novel sulfate-reducers using PG as a SO42- source.
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Affiliation(s)
- Ayoub Bounaga
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University (UM6P), Benguerir, 43150, Morocco
| | - Anwar Alsanea
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, AZ 85287-5701, USA
| | - Mohammed Danouche
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University (UM6P), Benguerir, 43150, Morocco
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, AZ 85287-5701, USA
| | - Chen Zhou
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875017, Tempe, AZ 85287-5701, USA
| | - Rachid Boulif
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University (UM6P), Benguerir, 43150, Morocco
| | - Youssef Zeroual
- Situation Innovation, OCP Group BP 118, Jorf Lasfar El Jadida 24000, Morocco
| | - Rachid Benhida
- Department of Chemical & Biochemical Sciences-Green Process Engineering (CBS), Mohammed VI Polytechnic University (UM6P), Benguerir, 43150, Morocco; Institute of Chemistry, Nice UMR7272, Côte d'Azur University, French National Centre for Scientific Research (CNRS), Nice, France
| | - Karim Lyamlouli
- College of Sustainable Agriculture and Environmental Sciences, Agrobioscience program, Mohammed VI Polytechnic University, Benguerir 43150, Morocco.
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10
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Escobar-Sánchez H, Carril Pardo C, Benito N, Hernández-Montelongo J, Nancucheo I, Recio-Sánchez G. Plasmonic and Photothermal Effects of CuS Nanoparticles Biosynthesized from Acid Mine Drainage with Potential Drug Delivery Applications. Int J Mol Sci 2023; 24:16489. [PMID: 38003680 PMCID: PMC10671710 DOI: 10.3390/ijms242216489] [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: 09/28/2023] [Revised: 11/07/2023] [Accepted: 11/11/2023] [Indexed: 11/26/2023] Open
Abstract
In this work, the plasmonic and photothermal effects of CuS nanoparticles biosynthesized from acid mine drainage (AMD) were studied. CuS were formed by delivering the H2S generated by a sulfidogenic bioreactor to an off-line system containing the AMD. The precipitates collected after contact for an hour were washed and physico-chemically characterized, showing a nanoparticle with a mean diameter of 33 nm, crystalline nature and semiconductor behavior with a direct band gap of 2.2 eV. Moreover, the CuS nanoparticles exhibited localized surface plasmonic resonance in the near infrared range, with a high absorption band centered at 973 nm of wavelength, which allowed an increase in the temperature of the surrounding media under irradiation. Finally, the cytotoxicity of the CuS nanoparticles as well as their potential use as part of drug delivery platforms were investigated.
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Affiliation(s)
- Hernán Escobar-Sánchez
- Departamento de Física, Universidad de Concepción, Concepción 4070386, Chile; (H.E.-S.); (N.B.)
| | - Claudio Carril Pardo
- Facultad de Ciencias de la Salud, Universidad San Sebastián, Concepción 4080871, Chile;
| | - Noelia Benito
- Departamento de Física, Universidad de Concepción, Concepción 4070386, Chile; (H.E.-S.); (N.B.)
| | | | - Iván Nancucheo
- Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Concepción 4080871, Chile;
| | - Gonzalo Recio-Sánchez
- Facultad de Ingeniería, Arquitectura y Diseño, Universidad San Sebastián, Concepción 4080871, Chile;
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11
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Yuan X, Cui K, Chen Y, Zhang Y, Wu S, Xie X, Liu T, Yao H. Microbial community and gene dynamics response to high concentrations of gadolinium and sulfamethoxazole in biological nitrogen removal system. CHEMOSPHERE 2023; 342:140218. [PMID: 37734503 DOI: 10.1016/j.chemosphere.2023.140218] [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: 08/15/2023] [Revised: 09/16/2023] [Accepted: 09/18/2023] [Indexed: 09/23/2023]
Abstract
The impact of high antibiotic and heavy metal pollution levels on biological nitrogen removal in wastewater treatment plants (WWTPs) remains poorly understood, posing a global concern regarding the issue spread of antibiotic resistance induced by these contaminants. Herein, we investigated the effects of gadolinium (Gd) and sulfamethoxazole (SMX), commonly found in medical wastewater, on biological nitrogen removal systems and microbial characteristics, and the fate of antibiotic resistance genes (ARGs), metal resistance genes (MRGs), and mobile genetic elements (MGEs). Our findings indicated that high SMX and Gd(III) concentrations adversely affected nitrification and denitrification, with Gd(III) exerting a strong inhibitory effect on microbial activity. Metagenomic analysis revealed that high SMX and Gd(III) concentrations could reduce microbial diversity, with Thauera and Pseudomonas emerging as dominant genera across all samples. While the relative abundance of most ARGs decreased under single Gd(III) stress, MRGs increased, and nitrification functional genes were inhibited. Conversely, combined SMX and Gd(III) pollution increased the relative abundance of intl1. Correlation analysis revealed that most genera could host ARGs and MRGs, indicating co-selection and competition between these resistance genes. However, most denitrifying functional genes exhibited a positive correlation with MRGs. Overall, our study provides novel insights into the impact of high concentrations of antibiotics and heavy metal pollution in WWTPs, and laying the groundwork for the spread and proliferation of resistance genes under combined SMX and Gd pollution.
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Affiliation(s)
- Xinrui Yuan
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Kangping Cui
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Yihan Chen
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Yao Zhang
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Shiyang Wu
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Xianjin Xie
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Tong Liu
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Hongjia Yao
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China
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12
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Wang D, Guan F, Feng C, Mathivanan K, Zhang R, Sand W. Review on Microbially Influenced Concrete Corrosion. Microorganisms 2023; 11:2076. [PMID: 37630635 PMCID: PMC10458460 DOI: 10.3390/microorganisms11082076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/07/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023] Open
Abstract
Microbially influenced concrete corrosion (MICC) causes substantial financial losses to modern societies. Concrete corrosion with various environmental factors has been studied extensively over several decades. With the enhancement of public awareness on the environmental and economic impacts of microbial corrosion, MICC draws increasingly public attention. In this review, the roles of various microbial communities on MICC and corresponding protective measures against MICC are described. Also, the current status and research methodology of MICC are discussed. Thus, this review aims at providing insight into MICC and its mechanisms as well as the development of protection possibilities.
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Affiliation(s)
- Dongsheng Wang
- Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (D.W.); (F.G.); (K.M.)
- School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;
| | - Fang Guan
- Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (D.W.); (F.G.); (K.M.)
- Guangxi Key Laboratory of Marine Environmental Science, Institute of Marine Corrosion Protection, Guangxi Academy of Sciences, Nanning 530007, China
| | - Chao Feng
- School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;
| | - Krishnamurthy Mathivanan
- Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (D.W.); (F.G.); (K.M.)
| | - Ruiyong Zhang
- Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (D.W.); (F.G.); (K.M.)
- Guangxi Key Laboratory of Marine Environmental Science, Institute of Marine Corrosion Protection, Guangxi Academy of Sciences, Nanning 530007, China
| | - Wolfgang Sand
- Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (D.W.); (F.G.); (K.M.)
- Aquatic Biotechnology, University of Duisburg-Essen, 45141 Essen, Germany
- Institute of Biosciences, Freiberg University of Mining and Technology, 09599 Freiberg, Germany
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13
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Li Y, Zhao Q, Liu M, Guo J, Xia J, Wang J, Qiu Y, Zou J, He W, Jiang F. Treatment and remediation of metal-contaminated water and groundwater in mining areas by biological sulfidogenic processes: A review. JOURNAL OF HAZARDOUS MATERIALS 2023; 443:130377. [PMID: 36444068 DOI: 10.1016/j.jhazmat.2022.130377] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 10/20/2022] [Accepted: 11/08/2022] [Indexed: 06/16/2023]
Abstract
Heavy metal pollution in the mining areas leads to serious environmental problems. The biological sulfidogenic process (BSP) mediated by sulfidogenic bacteria has been considered an attractive technology for the treatment and remediation of metal-contaminated water and groundwater. Notwithstanding, BSP driven by different sulfidogenic bacteria could affect the efficiency and cost-effectiveness of the treatment performance in practical applications, such as the microbial intolerance of pH and metal ions, the formation of toxic byproducts, and the consumption of organic electron donors. Sulfur-reducing bacteria (S0RB)-driven BSP has been demonstrated to be a promising alternative to the commonly used sulfate-reducing bacteria (SRB)-driven BSP for treating metal-contaminated wastewater and groundwater, due to the cost-saving in chemical addition, the high efficiency in sulfide production and metal removal efficiency. Although the S0RB-driven BSP has been developed and applied for decades, the present review works mainly focus on the developments in SRB-driven BSP for the treatment and remediation of metal-contaminated wastewater and groundwater. Accordingly, a comprehensive review for metal-contaminated wastewater treatment and groundwater remediation should be provided with the incorporation of the SRB- and S0RB-driven BSP. To identify the bottlenecks and to improve BSP performance, this paper reviews sulfidogenic bacteria presenting in metal-contaminated water and groundwater; highlight the critical factors for the metabolism of sulfidogenic bacteria during BSP; the ecological roles of sulfidogenic bacteria and the mechanisms of metal removal by sulfidogenic bacteria; and the application of the present sulfidogenic systems and their drawbacks. Accordingly, the research knowledge gaps, current process limitations, and future prospects were provided for improving the performance of BSP in the treatment and remediation of metal-contaminated wastewater and groundwater in mining areas.
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Affiliation(s)
- Yu Li
- School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China
| | - Qingxia Zhao
- School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China
| | - Ming Liu
- State Environmental Protection Key Laboratory of Urban Ecological Environment Simulation and Protection, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510655, China
| | - Jiahua Guo
- School of Environmental Science & Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Juntao Xia
- School of Environmental Science & Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Jinting Wang
- Department of Civil and Environmental Engineering, Water Technology Lab, Hong Kong Branch of Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Hong Kong University of Science & Technology, Hong Kong, China
| | - Yanying Qiu
- School of Environmental Science & Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Jiahui Zou
- School of Environmental Science & Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Weiting He
- School of Environment, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China
| | - Feng Jiang
- School of Environmental Science & Engineering, Sun Yat-sen University, Guangzhou 510275, China.
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14
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Schwarz A, Gaete M, Nancucheo I, Villa-Gomez D, Aybar M, Sbárbaro D. High-Rate Sulfate Removal Coupled to Elemental Sulfur Production in Mining Process Waters Based on Membrane-Biofilm Technology. Front Bioeng Biotechnol 2022; 10:805712. [PMID: 35340841 PMCID: PMC8942777 DOI: 10.3389/fbioe.2022.805712] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Accepted: 02/08/2022] [Indexed: 11/13/2022] Open
Abstract
It is anticipated that copper mining output will significantly increase over the next 20 years because of the more intensive use of copper in electricity-related technologies such as for transport and clean power generation, leading to a significant increase in the impacts on water resources if stricter regulations and as a result cleaner mining and processing technologies are not implemented. A key concern of discarded copper production process water is sulfate. In this study we aim to transform sulfate into sulfur in real mining process water. For that, we operate a sequential 2-step membrane biofilm reactor (MBfR) system. We coupled a hydrogenotrophic MBfR (H2-MBfR) for sulfate reduction to an oxidizing MBfR (O2-MBfR) for oxidation of sulfide to elemental sulfur. A key process improvement of the H2-MBfR was online pH control, which led to stable high-rate sulfate removal not limited by biomass accumulation and with H2 supply that was on demand. The H2-MBfR easily adapted to increasing sulfate loads, but the O2-MBfR was difficult to adjust to the varying H2-MBfR outputs, requiring better coupling control. The H2-MBfR achieved high average volumetric sulfate reduction performances of 1.7-3.74 g S/m3-d at 92-97% efficiencies, comparable to current high-rate technologies, but without requiring gas recycling and recompression and by minimizing the H2 off-gassing risk. On the other hand, the O2-MBfR reached average volumetric sulfur production rates of 0.7-2.66 g S/m3-d at efficiencies of 48-78%. The O2-MBfR needs further optimization by automatizing the gas feed, evaluating the controlled removal of excess biomass and S0 particles accumulating in the biofilm, and achieving better coupling control between both reactors. Finally, an economic/sustainability evaluation shows that MBfR technology can benefit from the green production of H2 and O2 at operating costs which compare favorably with membrane filtration, without generating residual streams, and with the recovery of valuable elemental sulfur.
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Affiliation(s)
- Alex Schwarz
- Civil Engineering Department, Universidad de Concepción, Concepción, Chile
| | - María Gaete
- Civil Engineering Department, Universidad de Concepción, Concepción, Chile
| | - Iván Nancucheo
- Facultad de Ingeniería y Tecnología, Universidad San Sebastián, Concepción, Chile
| | - Denys Villa-Gomez
- School of Civil Engineering, The University of Queensland, Brisbane, QLD, Australia
| | - Marcelo Aybar
- Civil Engineering Department, Universidad de Concepción, Concepción, Chile
| | - Daniel Sbárbaro
- Electrical Engineering Department, Universidad de Concepción, Concepción, Chile
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15
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Microbial transformations by sulfur bacteria can recover value from phosphogypsum: A global problem and a possible solution. Biotechnol Adv 2022; 57:107949. [PMID: 35337932 DOI: 10.1016/j.biotechadv.2022.107949] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 03/16/2022] [Accepted: 03/18/2022] [Indexed: 11/22/2022]
Abstract
Rising global population and affluence are increasing demands for food production and the phosphorus (P) fertilizers needed to grow that food. Essential are new approaches for managing the growing amount of phosphogypsum (PG) that is a by-product of phosphoric-acid production from phosphate rock. Today, only ~15% of the worldwide production of PG is recycled, mainly for agriculture and road construction. This review addresses microbial valorization of PG through strategies that apply sulfur-transforming bacteria: sulfate-reducing bacteria (SRB) and sulfur-oxidizing bacteria (SOB). The focus is on recovering elemental sulfur (S0), which can be used to make the sulfuric acid needed to produce phosphoric acid from rock phosphate. Our review provides in-depth understanding of the microbiological, chemical, and technological bases for microbial reclamation of S0 from PG. The review presents the principles and practices for sulfate leaching from PG, reduction of sulfate to sulfide by SRB, and oxidation of sulfide to S0 by SOB. The choice of electron donor for SRB, control of oxygen delivery to SOB, and nutrient requirements are emphasized. Although microorganism-based technologies for PG reclamation are far from mature, the efficiency of such SRB- and SOB-based processes has been documented at laboratory and industrial scales. This review should spur biotechnological advances toward recovering value from PG.
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16
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Zhang M, Xue Q, Zhang S, Zhou H, Xu T, Zhou J, Zheng Y, Li M, Kumar S, Zhao D, Xiang H. Development of whole-cell catalyst system for sulfide biotreatment based on the engineered haloalkaliphilic bacterium. AMB Express 2021; 11:142. [PMID: 34693461 PMCID: PMC8542531 DOI: 10.1186/s13568-021-01302-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 10/12/2021] [Indexed: 11/10/2022] Open
Abstract
Microorganisms play an essential role in sulfide removal. Alkaline absorption solution facilitates the sulfide’s dissolution and oxidative degradation, so haloalkaliphile is a prospective source for environmental-friendly and cost-effective biodesulfurization. In this research, 484 sulfide oxidation genes were identified from the metagenomes of the soda-saline lakes and a haloalkaliphilic heterotrophic bacterium Halomonas salifodinae IM328 (=CGMCC 22183) was isolated from the same habitat as the host for expression of a representative sequence. The genetic manipulation was successfully achieved through the conjugation transformation method, and sulfide: quinone oxidoreductase gene (sqr) was expressed via pBBR1MCS derivative plasmid. Furthermore, a whole-cell catalyst system was developed by using the engineered strain that exhibited a higher rate of sulfide oxidation under the optimal alkaline pH of 9.0. The whole-cell catalyst could be recycled six times to maintain the sulfide oxidation rates from 41.451 to 80.216 µmol·min−1·g−1 dry cell mass. To summarize, a whole-cell catalyst system based on the engineered haloalkaliphilic bacterium is potentiated to be applied in the sulfide treatment at a reduced cost.
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17
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Mao L, Tsui TH, Zhang J, Dai Y, Tong YW. System integration of hydrothermal liquefaction and anaerobic digestion for wet biomass valorization: Biodegradability and microbial syntrophy. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 293:112981. [PMID: 34102499 DOI: 10.1016/j.jenvman.2021.112981] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 04/27/2021] [Accepted: 05/30/2021] [Indexed: 06/12/2023]
Abstract
Sewage sludge treatment & disposal pose environmental challenges in populated-dense urban environments. Due to its poor digestibility and dewaterability, sewage sludge contains high water content and concentrated nutrients (carbon, nitrogen, and phosphorus) even after conditioning and mechanical thickening. Regarding this, a pretreatment step and downstream anaerobic digestion (AD) are often required. To meet our societal goal towards a circular economy, system integration of hydrothermal pretreatment and AD now present an attractive approach for recovering resources from the wet sewage sludge biomass. In this study, such system integration together with struvite precipitation was applied for valorizing sewage sludge. Firstly, hydrothermal conditions of different temperatures (160 °C-230 °C) and duration (2 h-12 h) were compared to their performance of nutrients solubilization. Subsequently, the hydrothermal condition of 220°C-3 h was selected for further investigations of struvite recovery and bioenergy production. Through AD comparisons, the integrated process improved the ultimate biomethane yield by 38%. Interestingly, a lag phase occurred in the midst of the AD, which indicated the need for microbial acclimatization after the hydrothermal process. The long-term microbial monitoring revealed the efficient biomethane re-generation was closely related to the late enrichment of Syntrophus for potential H2-syntrophy. Therefore, on one hand, this study investigated an efficient and integrated approach of sewage sludge valorization. On other hand, it uncovered the microbial bottlenecks and potential biotechnological means for further system improvement. Further research about nutrients speciation in the integrated system would be desired.
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Affiliation(s)
- Liwei Mao
- NUS Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower #15-02, Singapore 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore; Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585
| | - To-Hung Tsui
- NUS Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower #15-02, Singapore 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore
| | - Jingxin Zhang
- China-UK Low Carbon College, Shanghai Jiaotong University, 3 YinlianRoad, Shanghai, 201306, China
| | - Yanjun Dai
- School of Mechanical Engineering, Shanghai Jiaotong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Yen Wah Tong
- NUS Environmental Research Institute, National University of Singapore, 1 Create Way, Create Tower #15-02, Singapore 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore; Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585.
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18
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Micro-Oxygenation in Upflow Anaerobic Sludge Bed (UASB) Reactors Using a Silicon Membrane for Sulfide Oxidation. Polymers (Basel) 2020; 12:polym12091990. [PMID: 32882933 PMCID: PMC7566014 DOI: 10.3390/polym12091990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 08/24/2020] [Accepted: 08/26/2020] [Indexed: 11/17/2022] Open
Abstract
Sulfide produced by sulphate-reducing bacteria in anaerobic reactors can seriously affect biogas quality. Microaeration has become a reliable way to remove sulfide, by promoting its oxidation. However, limited research is available regarding its application in upflow anaerobic sludge bed (UASB) reactors. In this research, silicon membranes were studied as a mechanism to dose oxygen in USAB reactors. Two configurations were tested: the membrane placed inside the reactor or in an external module. Our results show that the external membrane proved to be a more practical alternative, providing conditions for sulfide oxidation. This led to a reduction in its concentration in the liquid effluent and biogas. External membrane configuration achieved a sulfide conversion rate of 2.4 g-S m2 d−1. Since the membrane was not sulfide-selective, methane losses were observed (about 9%). In addition, excessive oxygen consumption was observed, compared to the stoichiometric requirement. As is the case for many membrane-based systems, membrane area is a key factor determining the correct operation of the system.
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