title: Effect of acclimatization on hexavalent chromium reduction in a biocathode microbial fuel cell.
abstract: A simple acclimatization method for the reduction of hexavalent chromium (Cr(VI)) at a biocathode by first enriching an exoelectrogenic biofilm on a microbial fuel cell (MFC) anode, followed by direct inversion of the anode to function as the biocathode, has been established. This novel method significantly enhanced the Cr(VI) reduction efficiency of the MFC, which was mainly attributed to the higher microbial density and less resistive Cr(III) precipitates on the cathode when compared with a common biocathode acclimatization method (control). The biocathode acclimatization period was shortened by 19days and the Cr(VI) reduction rate was increased by a factor of 2.9. Microbial community analyses of biocathodes acclimatized using different methods further verified the feasibility of this electrode inversion method, indicating similar dominant bacteria species in biofilms, which mainly consist of Gamma-proteobacteria and Bacteria.
authors.affiliation: College of Biotechnology and Pharmaceutical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, PR China.
authors.forename: Xiayuan
authors.initials: X
authors.lastname: Wu
authors.affiliation: College of Horticulture, Nanjing Agricultural University, Nanjing 210095, PR China.
authors.forename: Xujun
authors.initials: X
authors.lastname: Zhu
authors.affiliation: College of Biotechnology and Pharmaceutical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, PR China.
authors.forename: Tianshun
authors.initials: T
authors.lastname: Song
authors.affiliation: College of Biotechnology and Pharmaceutical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, PR China.
authors.forename: Lixiong
authors.initials: L
authors.lastname: Zhang
authors.affiliation: College of Biotechnology and Pharmaceutical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, PR China. Electronic address: ijbtg2009@163.com.
authors.forename: Honghua
authors.initials: H
authors.lastname: Jia
authors.affiliation: College of Biotechnology and Pharmaceutical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 211816, PR China.
authors.forename: Ping
authors.initials: P
authors.lastname: Wei
mesh_terms: D000064:Acclimatization; D001419:Bacteria / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D001674:Bioelectric Energy Sources / Q000382:microbiology; D002857:Chromium / Q000378:metabolism*; D004566:Electrodes; D004867:Equipment Design; D008855:Microscopy, Electron, Scanning; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D010802:Phylogeny
chemical_list: D002857:Chromium; C074702:chromium hexavalent ion
keywords: Acclimatization method; Biocathode; Cr(VI) reduction; Electricity generation; Microbial fuel cell