An anaerobic fluidized bed microbial fuel cell(AFBMFC) using waste water and active carbon as liquid and solid phases was employed to investigate the effects of electron mediator's category and concentration on the electrogenesis capacity of the MFC. Methylene Blue(MB)、 Neutral Red(NR) and Potassium Ferricyanide were used as electron mediators, respectively. The results show that the electrogenesis capacity of AFBMFC can be enhanced a little when MB was used as electron mediator, while the power polarity reverses and the electrogenesis capacity decreases when Potassium Ferricyanide was used as electron mediator. It indicates that the performance of AFBMFC is not ideal in both cases. When NR was employed as electron mediator, it was found by fitting the polarization curve that the internal resistance is remarkably reduced. The maximum output voltage, volumetric power density and COD remove rate of MFC with 1.7 mmol·L-1 NR as medium are 650 Mv, 330 mWm-2 and 91%, respectively. It demonstrates that the NR is a kind of optimum electron mediators for AFBMFC.%在空气阴极、单室、无膜液固厌氧流化床微生物燃料电池(AFBMFC)中,以污水和椰壳活性炭为液相和固相,分别以亚甲基蓝(MB)、中性红(NR)及铁氰化钾为电子介体,考察电子介体的种类和浓度对厌氧流化床微生物燃料电池产电性能的影响.实验结果表明,亚甲基篮可以提高AFBMFC产电量,但增加幅度较小；添加铁氰化钾后,电池正负极逆转,且产电量减小,使用这两种介体产电性能均不理想.添加中性红后,MFC的内阻显著降低.以1.7 mmol·L-1中性红为电子介体时获得最大输出电压650 mV,最大输出功率密度330 mW·m-2,COD去除率为91％.对于厌氧流化床微生物燃料电池而言,中性红是一种较为理想的电子介体.
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