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

Mineralization of pentachlorophenol with enhanced degradation and power generation from air... The combined anaerobic–aerobic 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°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: 2211–2221. © 2012 Wiley Periodicals, Inc. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biotechnology and Bioengineering Wiley

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

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References (60)

Publisher
Wiley
Copyright
Copyright © 2012 Wiley Periodicals, Inc.
ISSN
0006-3592
eISSN
1097-0290
DOI
10.1002/bit.24489
pmid
22392229
Publisher site
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Abstract

The combined anaerobic–aerobic 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°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: 2211–2221. © 2012 Wiley Periodicals, Inc.

Journal

Biotechnology and Bioengineering – Wiley

Published: Sep 1, 2012

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