Long-term open circuit microbial electrosynthesis system promotes methanogenesis  

作　　者：Raúl Mateos Adrián Escapa María Isabel San-Martín Heleen De Wever Ana Sotres Deepak Pant 

机构地区：[1]Chemical and Environmental Bioprocess Engineering Group,Natural Resources Institute(IRENA),University of Leon,Leon 24071,Spain [2]Department of Electrical Engineering and Automatic Systems,Universidad de Leon,Leon 24071,Spain [3]Reparation and Conversion Technology,Flemish Institute for Technological Research(VITO),Mol 2400,Belgium

出　　处：《Journal of Energy Chemistry》2020年第2期3-6,共4页能源化学（英文版）

基　　金：the Spanish“Ministerio de Educación,Cultura y Deporte”for the predoctoral FPU Grant(FPU14/01573);the‘Ministerio de Economía y Competitividad’for the support of project ref:CTQ2015-68925-R(MINECO/FEDER,EU)。

摘　　要：Microbial electrosynthesis(MES) can potentially provide a mean for storing renewable energy surpluses as chemical energy. However, the fluctuating nature of these energy sources may represent a threat to MES, as the microbial communities that develop on the biocathode rely on the continuous existence of a polarized electrode. This work assesses how MES performance, product generation and microbial community evolution are affected by a long-period(6 weeks) power off(open circuit). Acetogenic and H2-producing bacteria activity recovered after reconnection. However, few days later syntrophic acetate oxidation bacteria and H2-consuming methanogens became dominant, producing CH4 as the main product, via electromethanogenesis and the syntrophic interaction between eubacterial and archaeal communities which consume both the acetic acid and the hydrogen present in the cathode environment. Thus,the system proved to be resilient to a long-term power interruption in terms of electroactivity. At the same time, these results demonstrated that the system could be extensively affected in both end product generation and microbial communities.Microbial electrosynthesis(MES) can potentially provide a mean for storing renewable energy surpluses as chemical energy. However, the fluctuating nature of these energy sources may represent a threat to MES, as the microbial communities that develop on the biocathode rely on the continuous existence of a polarized electrode. This work assesses how MES performance, product generation and microbial community evolution are affected by a long-period(6 weeks) power off(open circuit). Acetogenic and H2-producing bacteria activity recovered after reconnection. However, few days later syntrophic acetate oxidation bacteria and H2-consuming methanogens became dominant, producing CH4 as the main product, via electromethanogenesis and the syntrophic interaction between eubacterial and archaeal communities which consume both the acetic acid and the hydrogen present in the cathode environment. Thus,the system proved to be resilient to a long-term power interruption in terms of electroactivity. At the same time, these results demonstrated that the system could be extensively affected in both end product generation and microbial communities.

关 键 词：BIOCATHODE Electromethanogenesis MICROBIAL ELECTROSYNTHESIS MICROBIAL community dynamics METHANOGENS ACETOGENS 

分 类 号：TM91[电气工程—电力电子与电力传动] TK02[动力工程及工程热物理]