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Sediment microbial fuel cell with floating biocathode for organic removal and energy recovery |
Aijie WANG1(), Haoyi CHENG1, Nanqi REN1, Dan CUI1, Na LIN1, Weimin WU1,2 |
1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; 2. Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020, USA |
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Abstract A sediment microbial fuel cell (SMFC) with three dimensional floating biocathode (FBC) was developed for the electricity generation and biodegradation of sediment organic matter in order to avoid negative effect of dissolved oxygen (DO) depletion in aqueous environments on cathode performance and search cost-effective cathode materials. The biocathode was made from graphite granules with microbial attachment to replace platinum (Pt)-coated carbon paper cathode in a laboratory-scale SMFC (3 L in volume) filled with river sediment (organic content 49±4 g·kg-1 dry weight). After start-up of 10 days, the maximum power density of 1.00W·m-3 (based on anode volume) was achieved. The biocathode was better than carbon paper cathode catalyzed by Pt. The attached biofilm on cathode enhanced power generation significantly. The FBC enhanced SMFC performance further in the presence aeration. The SMFC was continuously operated for an over 120-day period. Power generation peaked within 24 days, declined gradually and stabilized at a level of 1/6 peak power output. At the end, the sediment organic matter content near the anode was removed by 29% and the total electricity generated was equal to 0.251 g of chemical oxygen demand (COD) removed.
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Keywords
microbial fuel cell (MFC)
sediment
biocathode
electricity generation
organic removal
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Corresponding Author(s):
WANG Aijie,Email:waj0578@hit.edu.cn
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Issue Date: 01 August 2012
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