Mineralization of pentachlorophenol with enhanced degradation and power generation from air cathode microbial fuel cells
Liping Huang, Linlin Gan, Ning Wang, Xie Quan +2
AI summary
70% confidenceResearchers used air-cathode single-chamber microbial fuel cells (MFCs) to mineralize pentachlorophenol (PCP) and generate power. The study found that PCP degradation rates increased with higher initial concentrations, but power generation decreased. The optimal conditions for power generation and PCP degradation were found to be at high pH and moderate temperatures.
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Abstract
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/m 3 (264 ± 39 W/m 2 , acetate) and 5.1 ± 0.1 W/m 3 (175 ± 5 W/m 2 , 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.
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Keywords
Identifiers
- Journal
- Biotechnology and Bioengineering
- Year
- 2012