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Mineralization of pentachlorophenol with enhanced degradation and power generation from air cathode microbial fuel cells

Authors Huang, Liping
Gan, Linlin
Wang, Ning
Quan, Xie
Logan, Bruce E.
Chen, Guohua View this author's profile
Issue Date 2012
Source Biotechnology and bioengineering , v. 109, (9), September 2012, p. 2211-2221
Summary The combined anaerobicaerobic conditions in air-cathode single-chamber MFCs were used to completely mineralize pentachlorophenol (PCP; 5?mg/L), in the presence of acetate or glucose. Degradation rates of 0.140?+/-?0.011?mg/L-h (acetate) and 0.117?+/-?0.009?mg/L-h (glucose) were obtained with maximum power densities of 7.7?+/-?1.1?W/m3 (264?+/-?39?W/m2, acetate) and 5.1?+/-?0.1?W/m3 (175?+/-?5?W/m2, glucose). At a higher PCP concentration of 15?mg/L, PCP degradation rates increased to 0.171?+/-?0.01?mg/L-h (acetate) and 0.159?+/-?0.011?mg/L-h (glucose). However, power was inversely proportional to initial PCP concentration, with decreases of 0.255?W/mg PCP (acetate) and 0.184?W/mg PCP (glucose). High pH (9.0, acetate; 8.0, glucose) was beneficial to exoelectrogenic activities and power generation, whereas an acidic pH?=?5.0 decreased power but increased PCP degradation rates (0.195?+/-?0.002?mg/L-h, acetate; 0.173?+/-?0.005?mg/L-h, glucose). Increasing temperature from 22 to 35 degrees C enhanced power production by 37% (glucose) to 70% (acetate), and PCP degradation rates (0.188?+/-?0.01?mg/L-h, acetate; 0.172?+/-?0.009?mg/L-h, glucose). Dominant exoelectrogens of Pseudomonas (acetate) and Klebsiella (glucose) were identified in the biofilms. These results demonstrate that PCP degradation using air-cathode single-chamber MFCs may be a promising process for remediation of water contaminated with PCP as well as for power generation. Biotechnol. Bioeng. 2012;109: 22112221. (c) 2012 Wiley Periodicals, Inc.
ISSN 0006-3592
Language English
Format Article
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