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Enhanced methane production by alleviating sulfide inhibition with a microbial electrolysis coupled anaerobic digestion reactor.

Abstract：

: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.

journal_name

Environ Int

journal_title

Environment international

authors

Yuan Y,Cheng H,Chen F,Zhang Y,Xu X,Huang C,Chen C,Liu W,Ding C,Li Z,Chen T,Wang A

doi

10.1016/j.envint.2020.105503

subject

Has Abstract

pub_date

2020-03-01 00:00:00

pages

105503

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(19)34543-X

journal_volume

136

pub_type

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