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Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor
Yuan, Ye; Cheng, Haoyi; Chen, Fan; Zhang, Yiqian; Xu, Xijun; Huang, Cong; Chen, Chuan; Liu, Wenzong; Ding, Cheng; Li, Zhaoxia; Chen, Tianming; Wang, Aijie
2020-03
Source PublicationENVIRONMENT INTERNATIONAL
ISSN0160-4120
Volume136Pages:1-9
AbstractAnaerobic 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 H-2 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.
Department中国科学院环境生物技术重点实验室
KeywordAnaerobic digestion (AD) Methanogenesis Sulfate reduction Microbial electrolysis Microbial community analysis
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/45163
Collection中国科学院环境生物技术重点实验室
Recommended Citation
GB/T 7714
Yuan, Ye,Cheng, Haoyi,Chen, Fan,et al. Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor[J]. ENVIRONMENT INTERNATIONAL,2020,136:1-9.
APA Yuan, Ye.,Cheng, Haoyi.,Chen, Fan.,Zhang, Yiqian.,Xu, Xijun.,...&Wang, Aijie.(2020).Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor.ENVIRONMENT INTERNATIONAL,136,1-9.
MLA Yuan, Ye,et al."Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor".ENVIRONMENT INTERNATIONAL 136(2020):1-9.
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