Microbial electrolysis contribution to anaerobic digestion of waste activated sludge, leading to accelerated methane production

RENEWABLE ENERGY

卷:91

Article

Liu, Wenzong¹  Cai, Weiwei²  Guo, Zechong²  Wang, Ling²  Yang, Chunxue²  Varrone, Cristiano³  Wang, Aijie^1,2 

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Environm Biotechnol, Beijing 100085, Peoples R China

[2] HIT, State Key Lab Urban Water Resource & Environm, SKLUWRE, Harbin 150090, Peoples R China

[3] Tech Univ Denmark, Ctr BioProc Engn, Dept Chem & Biochem Engn, DK-2800 Lyngby, Denmark

关键词: Microbial electrolysis AD reactor;    Waste activated sludge;    Energy recovery;    Bio-electron;    Methanogenesis;   

DOI  :  10.1016/j.renene.2016.01.082

来源: Elsevier

【 摘 要 】

Methane production rate (MPR) in waste activated sludge (WAS) digestion processes is typically limited by the initial steps of complex organic matter degradation, leading to a limited MPR due to sludge fermentation speed of solid particles. In this study, a novel microbial electrolysis AD reactor (ME-AD) was used to accelerate methane production for energy recovery from WAS. Carbon bioconversion was accelerated by ME producing H-2 at the cathode. MPR was enhanced to 91.8 gCH(4)/m(3) reactor/d in the microbial electrolysis ME-AD reactor, thus improving the rate by 3 times compared to control conditions (30.6 gCH(4)/m(3) reactor/d in AD). The methane production yield reached 116.2 mg/g VSS in the ME-AD reactor. According to balance calculation on electron transfer and methane yield, the increased methane production was mostly dependent on electron contribution through the ME system. Thus, the use of the novel ME-AD reactor allowed to significantly enhance carbon degradation and methane production from WAS. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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