title: Physiological and electrochemical effects of different electron acceptors on bacterial anode respiration in bioelectrochemical systems.
abstract: To understand the interactions between bacterial electrode respiration and the other ambient bacterial electron acceptor reductions, alternative electron acceptors (nitrate, Fe2O3, fumarate, azo dye MB17) were added singly or multiply into Shewanella decolorationis microbial fuel cells (MFCs). All the added electron acceptors were reduced simultaneously with current generation. Adding nitrate or MB17 resulted in more rapid cell growth, higher flavin concentration and higher biofilm metabolic viability, but lower columbic efficiency (CE) and normalized energy recovery (NER) while the CE and NER were enhanced by Fe2O3 or fumarate. The added electron acceptors also significantly influenced the cyclic voltammetry profile of anode biofilm probably via altering the cytochrome c expression. The highest power density was observed in MFCs added with MB17 due to the electron shuttle role of the naphthols from MB17 reduction. The results provided important information for MFCs applied in practical environments where contains various electron acceptors.
authors.affiliation: State Key Laboratory of Applied Microbiology Southern China, Guangzhou, China; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China.
authors.forename: Yonggang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China.
authors.forename: Yinbo
authors.initials: Y
authors.lastname: Xiang
authors.affiliation: Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China.
authors.forename: Chunyu
authors.initials: C
authors.lastname: Xia
authors.affiliation: Department of Civil & Environmental Engineering, Center for Sustainable Development & Global Competitiveness, Stanford University, Stanford 94305-4020, USA.
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Applied Microbiology Southern China, Guangzhou, China; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China.
authors.forename: Guoping
authors.initials: G
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Applied Microbiology Southern China, Guangzhou, China; Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou, China. Electronic address: xumy@gdim.cn.
authors.forename: Meiying
authors.initials: M
authors.lastname: Xu
mesh_terms: D000332:Aerobiosis; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D018441:Biofilms / Q000254:growth & development; D004138:Dinitrocresols / Q000378:metabolism; D004560:Electricity; D055664:Electrochemical Techniques; D004566:Electrodes; D004583:Electrons; D050296:Microbial Viability; D020592:Shewanella / Q000254:growth & development / Q000502:physiology*
chemical_list: D004138:Dinitrocresols; C024132:4,6-dinitro-o-cresol
keywords: Additional electron acceptors; Anaerobic respiration; Microbial fuel cells; Shewanella decolorationis