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In relation to this article, we declare that there is no conflict of interest.
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Received September 2, 2009
Accepted December 8, 2009
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Microbial community dynamics and electron transfer of a biocathode in microbial fuel cells

1Department of Environmental Engineering, Pusan National University, Busan 609-735, Korea 2School of Civil Engineering, Hefei University of Technology, Hefei 230009, China
cwkim@pusan.ac.kr
Korean Journal of Chemical Engineering, September 2010, 27(5), 1513-1520(8), 10.1007/s11814-010-0231-6
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Abstract

Microbial community dynamics and its electron transfer process within a biocathode in a microbial fuel cell (MFC) were investigated in this study. The MFC was operated steadily over 400 days, and the power density reached 1.92 and 10.27W/m3 based on the reduction of nitrate and oxygen, respectively. The six major groups of the clones that were categorized among the 26 clone types were Proteobacteria, Bacteroidetes, Actinobacteria, Planctomycetes, Firmicutes and uncultured bacteria. Microbial community dynamics showed that Betaproteobacteria was replaced by Gammaproteobacteria as the most abundant division among all the clone types with a percentage of 48.86% in the cathode compartment, followed by 20.45% of uncultured bacteria, 17.05% of Bacteroidetes, and others. Distinct oxidation and reduction peaks could be observed in the profiles of cathodic effluent during the cyclic and differential pulse voltammetry tests. It confirmed that nitrate and oxygen reduction in the cathode compartment could be significantly_x000D_ enhanced by the presence of microbes, which are able to excrete metabolites to assist the electron transfer process either in the anode or in the cathode compartment.

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