Syntrophic interactions between H2-scavenging and anode-respiring bacteria can improve current density in microbial electrochemical cells

被引：68

作者：

Gao, Yaohuan ^{[1
]}

Ryu, Hodon ^{[2
]}

Domingo, Jorge W. Santo ^{[2
]}

Lee, Hyung-Sool ^{[1
]}

机构：

[1] Univ Waterloo, Dept Civil & Environm Engn, Waterloo, ON N2L 3G1, Canada

[2] US EPA, Natl Risk Management Res Lab, Cincinnati, OH 45268 USA

来源：

BIORESOURCE TECHNOLOGY | 2014年 / 153卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Homoacetogens; Anaerobic digester (AD); Microbial electrochemical cells (MECs); Anode-respiring bacteria (ARB); Methanogens; ELECTRICITY-GENERATION; FUEL-CELLS; HOMOACETOGENIC BACTERIA; ACETOGENIC BACTERIA; HYDROGEN; MICROORGANISMS; OXIDATION; REACTORS; METHANE; GROWTH;

D O I：

10.1016/j.biortech.2013.11.077

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

High current density of 10.0-14.6 A/m(2) and COD removal up to 96% were obtained in a microbial electrochemical cell (MEC) fed with digestate at hydraulic retention time (HRT) of 4 d and 8 d. Volatile fatty acids became undetectable in MEC effluent (HRT 8 d), except for trivial acetate (4.16 +/- 1.86 mg COD/L). Accumulated methane only accounted for 3.42% of Delta COD. Pyrosequencing analyses showed abundant fermenters (Kosmotoga spp.) and homoacetogens (Treponema spp.) in anolytes. In anode biofilm, propionate fermenters (Kosmotoga, and Syntrophobacter spp.), homoacetogens (Treponema spp.), and anode-respiring bacteria (ARB) (Geobacter spp. and Dysgonomonas spp.) were dominant. These results imply that syntrophic interactions among fermenters, homoacetogens and ARB would allow MECs to maintain high current density and coulombic efficiency. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：245 / 253

页数：9

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