Effects of potassium permanganate on electricity generation of cattle manure microbial fuel cell with a long-term operation
SHEN Jian-guo1, HU Chun-guang1, XIN Yan-jun1, WANG Cheng-xian1,2, ZHANG Xin-wang1, DING Ning1
1. Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China; 2. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201400, China
Abstract：In order to investigate the effects of KMnO4 as the electron acceptor on the electricity generation of cattle manure fermentation with a long-term operation, the dual-chamber microbial fuel cell (MFC) was designed with cattle manure as main substrate, and the effects of KMnO4 (50, 200, 800mg/L) on electricity generation were analyzed. During MFCs operation, the variation of parameters such as open-circuit potential, external voltage, power density, coulombic efficiency and net energy production were analyzed. Results showed that when the concentration of KMnO4 was 800mg/L, the highest open-circuit potential and external voltage of 1148mV and 234mV were obtained, and the power density reached 177mW/m3 at 1kΩ external load. The maximum coulombic efficiency and net energy production arrived 18% and 19.5MJ/t. After 203 days, the removal rate of COD arrived 68.1%. During the operation of cells, the concentration of VFA and pH changed obviously. The VFA of MFC-800 increased to 388mmol/L, compared with the initial concentration, increased by 3.5times. The pH value decreased from 7.25 to 5.71. In addition, the nutrition content of anodic fermentation residue met the standard of organic fertilizer (NY525-2012). Therefore, the residue of anode fermentation could be used for organic fertilizer production.
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