Study on the performance of photosynthetic microbial fuel cell in the treatment of kitchen biogas slurry
WU Lü-zhou1, YANG Min1,2,3, CHEN Hong2, ZHANG Bo-wu4, CHEN Ping1, LIU Chun-hua1, KUANG Yin-jie1, WANG Ai-jie3
1. School of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2 School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410114, China; 3. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 4. Hunan United Food Waste Management Co., Ltd., Changsha 410003, China
Abstract：Chlorella was used as the cathode of the double-chamber photosynthetic algae microbial fuel cell (PAMFC) to provide electron acceptors, and thus to achieve the goal of sewage treatment and energy recovery. The effects of biocathode inoculation methods and light conditions on the bioelectricity generation performance and the treatment effect of kitchen biogas slurry wastewater were studied, and the polarization and electricity generation mechanism of PAMFC electrode was studied by cyclic voltammetry (CV) method. The results showed that the microalgae biofilm cathode PAMFC had better pollutant removal and power generation performance than the control group, with COD, TN and TP removal ratio up to 82.4%, 54.5% and 82.3%, and open circuit voltage and maximum power density up to 603.0mV and 41.5mW/m2. While the pollutant removal mainly occurred at the anode, the cathode reduced and removed the ammonium ions from the anode, and the cathode reaction generated oxygen as the electron acceptor of the anode, which increased the system current and improved the anode treatment efficiency. Under continuous light condition, PAMFC's power generation performance and pollutant removal rate were slightly higher than that under intermittent light condition, but intermittent light avoided cathode light saturation and oxygen saturation when the anode substrate was insufficient, which was more in line with continuous operation requirements. The cyclic voltammetry curve of the PAMFC cathode showed that the experimental group with the microalgae cathode had higher output voltage, higher reduction peak, and stronger power density, but attention must be paid to that the thickening of the microalgae biofilm affected the oxygen mass transfer efficiency in long-term operation.
吴旅州, 杨敏, 陈宏, 张博武, 陈平, 刘春华, 匡尹杰, 王爱杰. 光合微生物燃料电池处理餐厨沼液的性能研究[J]. 中国环境科学, 2020, 40(12): 5308-5317.
WU Lü-zhou, YANG Min, CHEN Hong, ZHANG Bo-wu, CHEN Ping, LIU Chun-hua, KUANG Yin-jie, WANG Ai-jie. Study on the performance of photosynthetic microbial fuel cell in the treatment of kitchen biogas slurry. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5308-5317.
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