Bioelectrochemical regulation accelerates biomethane production from waste activated sludge: Focusing on operational performance and microbial community
Bioelectrochemical regulation accelerates biomethane production from waste activated sludge: Focusing on operational performance and microbial community
复制标题
生物电化学调节加速废弃活性污泥的生物甲烷生产：关注运行性能和微生物群落
DOI：
10.1016/j.scitotenv.2021.152736
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发表时间：
2022
影响因子：
9.8
通讯作者：
Zhen G.
中科院分区：
文献类型：
--
作者：
Zhi Z.;Pan Y.;Lu X.;Wang J.;Zhen G.
生物电化学调控是一种新兴的生物废弃物厌氧消化强化策略。本文以活性污泥为研究对象，以碳刷为阳极，Ti/RuO 2-石墨毡为阴极，构建了一种新型的微生物电解池（MEC）系统，探讨了生物电化学调控在功能微生物增殖/富集和污泥甲烷化中的作用。应用生物电化学调控显著提高了甲烷产量。当外加电压为1.2V，固体停留时间为15 d时，甲烷产率最高可达16.4mL/L反应器，比单一AD的甲烷产率高8.6倍。进一步的分析表明，生物电化学调节选择性地富集了MEC-AD系统中的电活性发酵伴侣和产甲烷菌（特别是Thermincola，Methanobacterium），并建立了强大的互养相互作用。这推动了复杂有机物的分解和同时生物电还原沼气中的CO2，随后提高甲烷的产生。此外，生物电化学模拟减少了N2 O的排放，提高了消化污泥的脱水性能。
Bioelectrochemical regulation represents a newly emerging strategy to enhance anaerobic digestion (AD) of biowastes. Herein, a novel microbial electrolysis cell (MEC) system, equipped with a pair of carbon brush anode and hybrid Ti/RuO2-graphite felt cathode, was developed to explore the role of bioelectrochemical regulation in the proliferation/enrichment of functional microbes and methanation of waste activated sludge. The methane production was significantly improved by applying bioelectrochemical regulation. The maximum methane yield was 16.4 mL/L-reactorat the applied external voltage 1.2 V and solids retention time 15 d, 8.6-time higher than that of a single AD. Further analysis demonstrated that bioelectrochemical regulation selectively enriched electroactive fermentative partners and methanogens (especiallyThermincola,Methanobacterium) in the MEC-AD system and built up a robust syntrophic interaction. This drove the decomposition of complex organics and concurrent bioelectroreduction of CO2in biogas and subsequently enhanced methane generation. Besides, bioelectrochemical simulation attenuated N2O emissions and enhanced the dewaterability of digested sludge.