title: Enhancement of hexavalent chromium reduction and electricity production from a biocathode microbial fuel cell.
abstract: Enhancement of Cr (VI) reduction rate and power production from biocathode microbial fuel cells (MFCs) was achieved using indigenous bacteria from Cr (VI)-contaminated site as inoculum and MFC architecture with a relatively large cathode-specific surface area of 340-900 m2 m(-3). A specific Cr (VI) reduction rate of 2.4 ± 0.2 mg g(-1)VSS h(-1) and a power production of 2.4 ± 0.1 W m(-3) at a current density of 6.9 A m(-3) were simultaneously achieved at an initial Cr (VI) concentration of 39.2 mg L(-1). Initial Cr (VI) concentration and solution conductivity affected Cr (VI) reduction rate, power production and coulombic efficiency. These findings demonstrate the importance of inoculation and MFC architecture in the enhancement of Cr (VI) reduction rate and power production. This study is a beneficial attempt to improve the efficiency of biocathode MFCs and provide a good candidate of bioremediation process for Cr (VI)-contaminated sites.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education (MOE), Department of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China. lphuang2008@gmail.com
authors.forename: Liping
authors.initials: L
authors.lastname: Huang
authors.forename: Jingwen
authors.initials: J
authors.lastname: Chen
authors.forename: Xie
authors.initials: X
authors.lastname: Quan
authors.forename: Fenglin
authors.initials: F
authors.lastname: Yang
mesh_terms: D001419:Bacteria / Q000378:metabolism* / Q000648:ultrastructure; D001674:Bioelectric Energy Sources; D002857:Chromium / Q000737:chemistry*; D004560:Electricity; D004566:Electrodes; D052918:Environmental Restoration and Remediation / Q000379:methods; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction
chemical_list: D002857:Chromium