Enlargement of anode for enhanced simultaneous azo dye decolorization and power output in air-cathode microbial fuel cell |
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| Authors: | Jian Sun Youming Li Yongyou Hu Bin Hou Qian Xu Yaping Zhang Sizhe Li |
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| Institution: | 1. Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510006, China
2. State Key Laboratory of Pulp and Paper Engineering, College of Light Industry and Food Science, South China University of Technology, Guangzhou, 510640, China
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| Abstract: | Air-cathode, microbial fuel cells (MFC) with different anode surface areas were evaluated for simultaneous decolorization of Congo Red and bioelectricity production. Doubling the anode area from 18 to 36?cm2 increased net power by 150?% (0.16–0.4?mW), normalized power (per anode surface area) by 22?% (88–107?mW?m?2) and Congo Red decolorization by 163?% (1.6–4.2?mg?l?1?h?1). Quadrupling the original anode area induced an additional 5?% increase (up to 4.2?mW) in net power and 174?% increase (up to 11.5?mg?l?1?h?1) in Congo Red decolorization; however, normalized power decreased by 85?% (down to 58?mW?m?2). Increased bacterial attachment could account for both the enhanced power and Congo Red decolorization in larger anode MFCs. The limited effect on power output likely arises from cathode limitation or inefficient utilization of anodes. |
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