Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor
Anaerobic digestion (AD) of organics is a challenging task under high-strength sulfate (SO42−) conditions. The generation of toxic sulfides by SO42−-reducing bacteria (SRB) causes low methane (CH4) production. This study investigated the feasibility of alleviating sulfide inhibition and enhancing CH...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-03-01
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| Series: | Environment International |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S016041201934543X |
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doaj-482918e281c440129f003d9e3e592a74 |
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| record_format |
Article |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Ye Yuan Haoyi Cheng Fan Chen Yiqian Zhang Xijun Xu Cong Huang Chuan Chen Wenzong Liu Cheng Ding Zhaoxia Li Tianming Chen Aijie Wang |
| spellingShingle |
Ye Yuan Haoyi Cheng Fan Chen Yiqian Zhang Xijun Xu Cong Huang Chuan Chen Wenzong Liu Cheng Ding Zhaoxia Li Tianming Chen Aijie Wang Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor Environment International |
| author_facet |
Ye Yuan Haoyi Cheng Fan Chen Yiqian Zhang Xijun Xu Cong Huang Chuan Chen Wenzong Liu Cheng Ding Zhaoxia Li Tianming Chen Aijie Wang |
| author_sort |
Ye Yuan |
| title |
Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor |
| title_short |
Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor |
| title_full |
Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor |
| title_fullStr |
Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor |
| title_full_unstemmed |
Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor |
| title_sort |
enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor |
| publisher |
Elsevier |
| series |
Environment International |
| issn |
0160-4120 |
| publishDate |
2020-03-01 |
| description |
Anaerobic digestion (AD) of organics is a challenging task under high-strength sulfate (SO42−) conditions. The generation of toxic sulfides by SO42−-reducing bacteria (SRB) causes low methane (CH4) production. This study investigated the feasibility of alleviating sulfide inhibition and enhancing CH4 production by using an anaerobic reactor with built-in microbial electrolysis cell (MEC), namely ME-AD reactor. Compared to AD reactor, unionized H2S in the ME-AD reactor was sufficiently converted into ionized HS− due to the weak alkaline condition created via cathodic H2 production, which relieved the toxicity of unionized H2S to methanogenesis. Correspondingly, the CH4 production in the ME-AD system was 1.56 times higher than that in the AD reactor with alkaline-pH control and 3.03 times higher than that in the AD reactors (no external voltage and no electrodes) without alkaline-pH control. MEC increased the amount of substrates available for CH4-producing bacteria (MPB) to generate more CH4. Microbial community analysis indicated that hydrogentrophic MPB (e.g. Methanosphaera) and acetotrophic MPB (e.g. Methanosaeta) participated in the two major pathways of CH4 formation were successfully enriched in the cathode biofilm and suspended sludge of the ME-AD system. Economic revenue from increased CH4 production totally covered the cost of input electricity. Integration of MEC with AD could be an attractive technology to alleviate sulfide inhibition and enhance CH4 production from AD of organics under SO42−-rich condition. Keywords: Anaerobic digestion (AD), Methanogenesis, Sulfate reduction, Microbial electrolysis, Microbial community analysis |
| url |
http://www.sciencedirect.com/science/article/pii/S016041201934543X |
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doaj-482918e281c440129f003d9e3e592a742020-11-25T02:06:19ZengElsevierEnvironment International0160-41202020-03-01136Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactorYe Yuan0Haoyi Cheng1Fan Chen2Yiqian Zhang3Xijun Xu4Cong Huang5Chuan Chen6Wenzong Liu7Cheng Ding8Zhaoxia Li9Tianming Chen10Aijie Wang11School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, ChinaKey Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, ChinaKey Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, ChinaSchool of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, ChinaState Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, ChinaState Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, ChinaState Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, ChinaKey Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, ChinaSchool of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, ChinaSchool of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, ChinaSchool of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China; Corresponding authors at: School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China (A. Wang).School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; Corresponding authors at: School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China (A. Wang).Anaerobic digestion (AD) of organics is a challenging task under high-strength sulfate (SO42−) conditions. The generation of toxic sulfides by SO42−-reducing bacteria (SRB) causes low methane (CH4) production. This study investigated the feasibility of alleviating sulfide inhibition and enhancing CH4 production by using an anaerobic reactor with built-in microbial electrolysis cell (MEC), namely ME-AD reactor. Compared to AD reactor, unionized H2S in the ME-AD reactor was sufficiently converted into ionized HS− due to the weak alkaline condition created via cathodic H2 production, which relieved the toxicity of unionized H2S to methanogenesis. Correspondingly, the CH4 production in the ME-AD system was 1.56 times higher than that in the AD reactor with alkaline-pH control and 3.03 times higher than that in the AD reactors (no external voltage and no electrodes) without alkaline-pH control. MEC increased the amount of substrates available for CH4-producing bacteria (MPB) to generate more CH4. Microbial community analysis indicated that hydrogentrophic MPB (e.g. Methanosphaera) and acetotrophic MPB (e.g. Methanosaeta) participated in the two major pathways of CH4 formation were successfully enriched in the cathode biofilm and suspended sludge of the ME-AD system. Economic revenue from increased CH4 production totally covered the cost of input electricity. Integration of MEC with AD could be an attractive technology to alleviate sulfide inhibition and enhance CH4 production from AD of organics under SO42−-rich condition. Keywords: Anaerobic digestion (AD), Methanogenesis, Sulfate reduction, Microbial electrolysis, Microbial community analysishttp://www.sciencedirect.com/science/article/pii/S016041201934543X |