Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-12-01

Journal: BIOELECTROCHEMISTRY

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 94

Page Number: 13-22

ISSN: 1567-5394

Key Words: Pentachlorophenol; Microbial fuel cell; Bioanode; Biocathode; Bioelectrochemical cell

Abstract: 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.