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Petriglieri F, Kondrotaite Z, Singleton C, Nierychlo M, Dueholm MKD, Nielsen PH. A comprehensive overview of the Chloroflexota community in wastewater treatment plants worldwide. mSystems 2023; 8:e0066723. [PMID: 37992299 PMCID: PMC10746286 DOI: 10.1128/msystems.00667-23] [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: 07/07/2023] [Accepted: 10/09/2023] [Indexed: 11/24/2023] Open
Abstract
IMPORTANCE Chloroflexota are often abundant members of the biomass in wastewater treatment plants (WWTPs) worldwide, typically with a filamentous morphology, forming the backbones of the activated sludge floc. However, their overgrowth can often cause operational issues connected to poor settling or foaming, impairing effluent quality and increasing operational costs. Despite their importance, few Chloroflexota genera have been characterized so far. Here, we present a comprehensive overview of Chloroflexota abundant in WWTPs worldwide and an in-depth characterization of their morphology, phylogeny, and ecophysiology, obtaining a broad understanding of their ecological role in activated sludge.
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Affiliation(s)
- Francesca Petriglieri
- Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
| | - Zivile Kondrotaite
- Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
| | - Caitlin Singleton
- Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
| | - Marta Nierychlo
- Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
| | - Morten K. D. Dueholm
- Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
| | - Per H. Nielsen
- Center for Microbial Communities, Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
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Wongkiew S, Polprasert C, Noophan PL, Koottatep T, Kanokkantapong V, Surendra KC, Khanal SK. Effects of vermicompost leachate on nitrogen, phosphorus, and microbiome in a food waste bioponic system. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 339:117860. [PMID: 37086642 DOI: 10.1016/j.jenvman.2023.117860] [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: 02/22/2023] [Revised: 03/29/2023] [Accepted: 04/01/2023] [Indexed: 05/03/2023]
Abstract
Food waste is rich in nutrients, such as nitrogen and phosphorus, and can be integrated with bioponics, a closed-loop agricultural system that combines hydroponics with biological nutrient recovery. Vermicompost leachate (VCL) supplementation has been shown to improve the co-composting of organic waste (i.e., compost quality) and the biodegradation of organic compounds. Thus, VCL has high potential for enhancing nutrient availability in bioponics from food waste. However, the understanding of nitrogen and phosphorus availability in food waste-based bioponics is limited, both with and without VCL. In this study, food waste derived from cafeteria vegetable waste was used as the substrate (500 g dry wt./system) in bioponics to grow lettuce (Lactuca sativa L.) for two consecutive cycles (35 days/cycle) without substrate replacement. VCL was applied weekly (1-5% v/v) and compared to the control without VCL. The results showed that the food waste in bioponics provided nitrogen and phosphorus for plant growth (15.5-65.8 g/lettuce head). Organic-degrading and nutrient-transforming bacteria (Hydrogenispora, Clostridium_sensu_stricto_1, Ruminiclostridium_1, Cellvibrio, Thauera, Hydrogenophaga, and Bacillus) were predominantly found in plant roots and residual food waste. VCL addition significantly increased nitrate, phosphate, and chemical oxygen demand levels in bioponics, owing to the nutrients in VCL and the enhancement of keystone microorganisms responsible for organic degradation and nutrient cycling (e.g., Ellin6067, Actinomyces, and Pirellula). These findings suggest that nitrogen, phosphorus, and organic carbon concentrations in an ecosystem of nutrient-transforming and organic-degrading microbes are key in managing nutrient recovery from food waste in bioponics.
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Affiliation(s)
- Sumeth Wongkiew
- Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand; Water Science and Technology for Sustainable Environment Research Unit, Chulalongkorn University, Bangkok, 10330, Thailand.
| | - Chongrak Polprasert
- Thammasat School of Engineering, Thammasat University, Pathumthani, Thailand
| | - Pongsak Lek Noophan
- Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok, 10900, Thailand
| | - Thammarat Koottatep
- Environmental Engineering and Management, School of Environment, Resources and Development, Asian Institute of Technology, Pathumthani, Thailand
| | - Vorapot Kanokkantapong
- Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand; Waste Utilization and Ecological Risk Assessment Research Unit, Chulalongkorn University, Bangkok, Thailand
| | - K C Surendra
- Department of Molecular Biosciences and Bioengineering, University of Hawai'i at Mānoa, Honolulu, HI, USA; Global Institute for Interdisciplinary Studies, 44600, Kathmandu, Nepal
| | - Samir Kumar Khanal
- Department of Molecular Biosciences and Bioengineering, University of Hawai'i at Mānoa, Honolulu, HI, USA; Department of Civil and Environmental Engineering, University of Hawai'i at Mānoa, Honolulu, HI, USA
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Roman MD, Sava C, Iluțiu-Varvara DA, Mare R, Pruteanu LL, Pică EM, Jäntschi L. Biological Activated Sludge from Wastewater Treatment Plant before and during the COVID-19 Pandemic. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:11323. [PMID: 36141596 PMCID: PMC9517470 DOI: 10.3390/ijerph191811323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/31/2022] [Accepted: 09/05/2022] [Indexed: 06/16/2023]
Abstract
The COVID-19 pandemic and the related measures brought a change in daily life that affected the characteristics of the municipal wastewater and further, of the biological activated sludge. The activated sludge process is the most widely used biological wastewater treatment process in developed areas. In this paper, we aim to show the situation of specific investigations concerning the variation of the physicochemical parameters and biological composition of the activated sludge from one conventional wastewater treatment plant from a metropolitan area. The investigations were carried out for three years: 2019, 2020 and 2021. The results showed the most representative taxa of microorganisms: Microtrix, Aspidisca cicada, Vorticella convallaria, Ciliata free of the unknown and Epistylis and Rotifers. Even if other microorganisms were found in the sludge flocs, their small presence did not influence in any way the quality of the activated sludge and of the wastewater treatment process. That is why we conclude that protozoa (especially Flagellates and Ciliates) and rotifers were the most important. Together with the values and variation of the physicochemical parameters, they indicated a good, healthy, and stable activated sludge, along with an efficient purifying treatment process, no matter the loading conditions.
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Affiliation(s)
- Marius-Daniel Roman
- Faculty of Building Services Engineering, Technical University of Cluj-Napoca, 28 Memorandumului Street, 400114 Cluj-Napoca, Romania
| | - Cornel Sava
- Faculty of Engineering Materials and the Environment, Technical University of Cluj-Napoca, 28 Memorandumului Street, 400114 Cluj-Napoca, Romania
| | - Dana-Adriana Iluțiu-Varvara
- Faculty of Building Services Engineering, Technical University of Cluj-Napoca, 28 Memorandumului Street, 400114 Cluj-Napoca, Romania
| | - Roxana Mare
- Faculty of Building Services Engineering, Technical University of Cluj-Napoca, 28 Memorandumului Street, 400114 Cluj-Napoca, Romania
| | - Lavinia-Lorena Pruteanu
- Department of Chemistry and Biology, North University Center at Baia Mare, Technical University of Cluj-Napoca, 76 Victoriei Street, 430122 Baia Mare, Romania
| | - Elena Maria Pică
- Faculty of Engineering Materials and the Environment, Technical University of Cluj-Napoca, 28 Memorandumului Street, 400114 Cluj-Napoca, Romania
| | - Lorentz Jäntschi
- Department of Physics and Chemistry, Technical University of Cluj-Napoca, 103-105 Bd. Muncii, 400641 Cluj-Napoca, Romania
- Institute for Doctoral Studies, Babes-Bolyai University, 1 M. Kogălniceanu Street, 400084 Cluj-Napoca, Romania
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Lu Q, Zhou J, Zhu G, Tan C, Chen S, Zhu X, Yan N, Zhang Y, Xu Q, Pan B, Rittmann BE. Anoxic/oxic treatment without biomass recycle. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 834:155166. [PMID: 35413348 DOI: 10.1016/j.scitotenv.2022.155166] [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] [Received: 02/17/2022] [Revised: 04/06/2022] [Accepted: 04/06/2022] [Indexed: 06/14/2023]
Abstract
The Anoxic/Oxic (A/O) process involves recirculating mixed liquor between its A and O tanks so that nitrate produced in the O tank can be used to for denitrification with influent COD in the A tank. Because biomass is recirculated along with nitrate, A/O operation leads to similar microbial communities in the A and O tanks, which may decrease the rates of denitrification and nitrification in each tank. Here, bench-scale experiments simulated this aspect of the A/O process by exchanging biomass between an anoxic flask and an oxic cylinder at exchange ratios of 0%, 20%, 30%, and 50%. Nitrification and denitrification rates were only 40% and 19% for 50% biomass exchange of that for no biomass exchange. Phylogenetic analysis documented that the microbial communities became much more similar with biomass exchange, and the finding was consistent with community composition in a full-scale A/O process in a municipal wastewater treatment plant. A two-stage vertical baffled bioreactor (VBBR) realized efficient total‑nitrogen removal in recirculation without biomass exchange. Average removals of COD and TN were respectively 6% and 22% higher for the two-stage VBBR than the conventional A/O process, but its hydraulic retention time (HRT) was 55% to 70% of the volume of a conventional A/O process treating the same influent wastewater. The VBBR was more efficient because its anoxic biofilm was enriched in denitrifying bacteria, while its oxic biofilm was enriched in nitrifying bacteria. For example, the phylum Chloroflexi was greater in the An-VBBR, while the phylum Proteobacteria was greater in the Ox-VBBR.
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Affiliation(s)
- Qinyuan Lu
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China
| | - Junqing Zhou
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Ge Zhu
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Chong Tan
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Songyun Chen
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Xiaohui Zhu
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Ning Yan
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Yongming Zhang
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China.
| | - Qiuen Xu
- Zhongke Sanjing Environmental Protection Co., Ltd, Anxi, Fujian 362400, PR China
| | - Bifeng Pan
- Zhongke Sanjing Environmental Protection Co., Ltd, Anxi, Fujian 362400, PR China
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287-5701, USA
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Chen PF, Zhang RJ, Du ZL, Wang GH, Dong HT, Cui B, Fan RP, Li LX, Wang QB, Liu YS, Sun ZM. Microbial composition and nitrogen removal pathways in a novel sequencing batch reactor integrated with semi-fixed biofilm carrier: evidence from a pilot study for low- and high-strength sewage treatment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:49105-49115. [PMID: 35212897 DOI: 10.1007/s11356-022-19382-w] [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] [Received: 11/29/2021] [Accepted: 02/20/2022] [Indexed: 06/14/2023]
Abstract
The sequencing batch reactor (SBR) activated sludge process is a well-established technology for sewage treatment. One of the drawbacks of SBRs, however, total nitrogen (TN) removals is insufficient. By means of introducing four improvements, including semi-fixed biofilm carrier, sludge elevation mixing and change for the mode of influent and effluent, compliant standard for TN discharge was obtained in this novel SBR configuration during low- and high-strength sewage load. To illustrate the microbial compositions and functions of the attached biofilm on semi-fixed carrier and the suspended aggregates, as well as the nitrogen removal pathway, high throughput 16S rRNA gene amplicon sequencing, PICRUSt2 algorithm, and KEGG database were applied. The results revealed that (i) the microbial communities from suspended aggregates and biofilm samples were significantly different from each other; (ii) during low-strength sewage loads, TN removal was mainly by nitrification-denitrification. The suspended aggregates was responsible for denitrification, while the biofilm was focused on ammonium oxidation; (iii) during high-strength sewage loads, function of nitrate reductase from suspended aggregates was faded, and anammox and N assimilation by biofilm became dominant. Meanwhile, TN removal referring to the formation of L-glutamine via assimilation was the main pathway.
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Affiliation(s)
- Peng-Fei Chen
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Rui-Jian Zhang
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China.
| | - Zhi-Li Du
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Guang-Hua Wang
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Hao-Tao Dong
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Bin Cui
- Graduate School, Guangzhou University, Guangzhou, 510060, China
| | - Ru-Pei Fan
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Lu-Xin Li
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Qian-Bin Wang
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Ying-Shi Liu
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
| | - Zhi-Min Sun
- Research center, Guangzhou Municipal Engineering Design & Research Institute, Guangzhou, 510060, China
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Zhang X, Linghu S, Chen Z, Gu H, Chen X, Wei X, Hu X, Yang Y, Gao Y. Bacterial diversity evolution process based on physicochemical characteristics of sludge treating hydroquinone during acclimation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:31686-31699. [PMID: 35001263 DOI: 10.1007/s11356-021-17325-5] [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: 07/02/2021] [Accepted: 10/29/2021] [Indexed: 06/14/2023]
Abstract
Hydroquinone is one of the main pollutants in coal-gasification wastewater, which is biologically toxic and difficult to remove. The aerobic biodegradation rate, organic toxicity, and microbial community structure at different acclimation stages of degradation of hydroquinone by activated sludge were investigated. In each acclimation cycle, the removal of hydroquinone reached 100% after 5 days, indicating that high-concentration hydroquinone in the activated sludge could be completely biodegraded. When the microbial flora was inhibited by the influent hydroquinone, the enzyme system experienced stress conditions and led to the secretion of secondary metabolites, extracellular protein of 5-10 kDa mainly contributing to the sludge organic toxicity. Microbial diversity analysis showed that with the increase of the concentration of hydroquinone, β-Proteus bacteria such as Azoarcus and Dechloromonas gradually accumulated, which improved the removal of hydroquinone with aerobic activated sludge in the sequencing batch reactor (SBR) system. As the inhibition degree exceeded the appropriate tolerance range of microorganisms, bacteria would secrete much more secondary metabolites, and the organic toxicity of sludge would reach a relatively high level.
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Affiliation(s)
- Xinyu Zhang
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
| | - Shanshan Linghu
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
| | - Zhichong Chen
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
| | - Hao Gu
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
| | - Xiurong Chen
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China.
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
| | - Xiao Wei
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
| | - Xueyang Hu
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
| | - Yingying Yang
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
| | - Yuqing Gao
- National Engineering Laboratory for High-Concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai, 200237, China
- Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
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Jiang X, Wang H, Wu P, Wang H, Deng L, Wang W. Nitrification performance evaluation of activated sludge under high potassium ion stress during high-ammonia nitrogen organic wastewater treatment. J Environ Sci (China) 2022; 111:84-92. [PMID: 34949376 DOI: 10.1016/j.jes.2021.03.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 03/07/2021] [Accepted: 03/07/2021] [Indexed: 06/14/2023]
Abstract
The recycling reverse osmosis (RO) membrane concentrate of some high-ammonia nitrogen (NH4+-N) organic wastewater to the biological unit could cause potassium ion (K+) accumulation, thereby affecting the removal of NH4+-N by activated sludge. Thus, the effects of high K+ stress on activated sludge nitrification performance was studied. The results showed that the high K+ stress promoted the floc sludge to produce more extracellular polymers (EPS), which accelerated the sludge sedimentation and enriched the biomass in sequential batch reactors (SBRs). The ammonia oxidation process and nitrite (NO2--N) oxidation process were further analyzed in the nitrification process. High K+ stress enriched ammonia oxidizing bacteria (AOB), which ensured the efficient ammonia oxidation process in SBRs, and ensured the removal rate of NH4+-N was maintained above 93%. However, high K+ stress (15g/L KCl) inhibited the activity of NO2--N oxidizing bacteria (NOB) and reduced the abundance of NOB, thus leading to the accumulation of NO2--N, and finally worsened the nitrification performance of activated sludge. In short, the performance of activated sludge will not be inhibited when the K+ in the wastewater does not exceed 5.23 g/L. The results could provide a reference for the optimization of the biological performance in treating high-NH4+-N organic wastewater with activated sludge coupled RO membrane treatment process.
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Affiliation(s)
- Xiaomei Jiang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
| | - Heng Wang
- Sichuan Academy of Environmental Policy and Planning, Chengdu 610041, China.
| | - Peike Wu
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
| | - Hong Wang
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China
| | - Liangwei Deng
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
| | - Wenguo Wang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China.
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Chen G, Wu W, Xu J, Wang Z. An anaerobic dynamic membrane bioreactor for enhancing sludge digestion: Impact of solids retention time on digestion efficacy. BIORESOURCE TECHNOLOGY 2021; 329:124864. [PMID: 33631451 DOI: 10.1016/j.biortech.2021.124864] [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: 12/29/2020] [Revised: 02/10/2021] [Accepted: 02/11/2021] [Indexed: 06/12/2023]
Abstract
An anaerobic dynamic membrane bioreactor (AnDMBR), which enabled the decoupling of hydraulic retention time (HRT) and solids retention time (SRT), was used for enhancing sludge digestion, with the associated mechanisms elucidated. With the increase of SRT, the biogas production and sludge reduction rate were both enhanced. The specific biogas production and volatile solids (VS) reduction rate were improved to 0.79 L/g VS and 55.9% under SRT 50 d, respectively. Microbial community analysis revealed that Chloroflexi, which is capable of degrading metabolites and dead cells, was enriched at longer SRT. Further analysis showed that both acetoclastic and hydrogenotrophic methanogenesis contributed to the enhanced biogas production under higher SRT compared to the dominance of acetoclastic methanogenesis under lower SRT. The enhanced utilization of organic matter and acetate at longer SRT further confirmed the mechanisms. The results highlighted the potential of AnDMBR for high-efficient sludge digestion.
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Affiliation(s)
- Guang Chen
- State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, School and Environment of Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Chengtou Wastewater Treatment Co., Ltd., Shanghai 201203, China
| | - Wei Wu
- State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, School and Environment of Science and Engineering, Tongji University, Shanghai 200092, China
| | - Jun Xu
- State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, School and Environment of Science and Engineering, Tongji University, Shanghai 200092, China
| | - Zhiwei Wang
- State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Institute of Pollution Control and Ecological Security, School and Environment of Science and Engineering, Tongji University, Shanghai 200092, China.
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