title: Reductive dechlorination and mineralization of pentachlorophenol in biocathode microbial fuel cells.
abstract: Simultaneous anaerobic and aerobic degradation pathways in two-chamber, tubular microbial fuel cells (MFCs) facilitated pentachlorophenol (PCP) mineralization by a mediator-less biocathode. PCP was degraded at a rate of 0.263 ± 0.05 mg/L-h (51.5 mg/g VSS-h) along with power generation of 2.5 ± 0.03 W/m(3). Operating the biocathode MFC at 50°C improved the PCP degradation rate to 0.523 ± 0.08 mg/L-h (103 mg/g VSS-h) and power production to 5.2 ± 0.03 W/m(3). A pH of 6.0 increased the PCP degradation rate to 0.365 ± 0.02 mg/L-h (71.5mg/g VSS-h), but reduced power. While mediators were not needed, adding anthraquinone-2,6-disulfonate increased power and PCP degradation rates. Dominant bacteria most similar to the anaerobic Desulfobacterium aniline, Actinomycetes and Streptacidiphilus, and aerobic Rhodococcus erythropolis, Amycolatopsis and Gordonia were found on the biocathode. These results demonstrate efficient degradation of PCP in biocathode MFCs and the effects of temperature, pH and mediators.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education (MOE), School 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: Xiaolei
authors.initials: X
authors.lastname: Chai
authors.forename: Xie
authors.initials: X
authors.lastname: Quan
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Logan
authors.forename: Guohua
authors.initials: G
authors.lastname: Chen
mesh_terms: D001419:Bacteria / Q000378:metabolism; D001483:Base Sequence; D001674:Bioelectric Energy Sources; D002713:Chlorine / Q000378:metabolism*; D017931:DNA Primers; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010416:Pentachlorophenol / Q000378:metabolism*; D013696:Temperature
chemical_list: D017931:DNA Primers; D002713:Chlorine; D010416:Pentachlorophenol