Bioanodes/biocathodes formed at optimal potentials enhance subsequent pentachlorophenol degradation and power generation from microbial fuel cells

被引:51
作者
Huang, Liping [1 ]
Wang, Qiang [1 ]
Quan, Xie [1 ]
Liu, Yaxuan [1 ]
Chen, Guohua [2 ]
机构
[1] Dalian Univ Technol, Sch Environm Sci & Technol, Minist Educ MOE, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China
[2] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China
关键词
Pentachlorophenol; Microbial fuel cell; Bioanode; Biocathode; Bioelectrochemical cell; HEXAVALENT CHROMIUM REDUCTION; SET ANODE POTENTIALS; GEOBACTER-SULFURREDUCENS; SP-NOV; BIOCATHODE; BIODEGRADATION; MINERALIZATION; DECHLORINATION; COMMUNITIES; PERFORMANCE;
D O I
10.1016/j.bioelechem.2013.05.001
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Bioanodes formed at an optimal potential of 200 mV vs. SHE and biocathodes developed at -300 mV vs. SHE in bioelectrochemical cells (BECs) enhanced the subsequent performances of microbial fuel cells (MFCs) compared to the un-treated controls. While the startup times were reduced to 320 h (bioanodes) and 420-440 h (biocathodes), PCP degradation rates were improved by 28.5% (bioanodes) and 21.5% (biocathodes), and power production by 41.7% (bioanodes) and 44% (biocathodes). Accordingly, there were less accumulated products of PCP de-chlorination in the biocathodes whereas PCP in the bioanodes was more efficiently de-chlorinated, resulting in the formation of a new product of 3,4,5-trichlorophenol (243 +/- 2.2 mu M at 96 h). Charges were diverted to more generation of electricity in the bioanodes at 200 mV while oxygen in the biocathodes at 300 mV acted as a primary electron acceptor. Dominant bacteria known as recalcitrant organic degraders and/or exoelectrogens/electrotrophs included Desulfovibrio carbinoliphilus and Dechlorospirillum sp. on the bioanodes at 200 my, and Desulfovibrio marrakechensis, Comamonas testosteroni and Comamonas sp. on the biocathodes at -300 mV. These results demonstrated that an optimal potential was a feasible approach for developing both bioanodes and biocathodes for efficient PCP degradation and power generation from MFCs. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:13 / 22
页数:10
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