期刊
BIORESOURCE TECHNOLOGY
卷 148, 期 -, 页码 9-14出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.08.108
关键词
Bioelectrochemical system; Electrochemically active bacteria; Dechlorination; Direct electron transfer; 454 Pyrosequencing technology
资金
- National Natural Science Foundation of China [21206145]
- China Postdoctoral Science Foundation [2012M510147]
Pentachlorophenol (PCP) was dechlorinated by electrochemically active bacteria using an electrode as the direct electron donor. Dechlorination efficiency and coulombic efficiency (CE) were investigated. When hydrogen evolution reaction was eliminated by controlling the potential, both dechlorination efficiency and CE increase as the potential decreases, which implied the dechlorination was stimulated by electric current rather than hydrogen gas. Further investigation of the cyclic voltammetry characterization of the medium revealed nearly no redox mediator secreted by the bacteria. Moreover, the comparison of dechlorination experiments carried out with filtered and unfiltered medium provided convincible evidence that the dominating electron transfer mechanism for the dechlorination is direct electron transfer. Additionally, 454 pyrosequencing technique was employed to gain a comprehensive understanding of the biocathodic microbial community. The results showed Proteobacteria, Bacteroidetes and Firmicutes were the three predominant groups. This paper demonstrated the direct electron transfer mechanism could be involved in PCP dechlorination with a biocathode. (C) 2013 Elsevier Ltd. All rights reserved.
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