厌氧流化床微生物燃料电池处理间甲酚废水及产电性能研究

M-cresol wastewater treatment in anaerobic fluidized bed microbial fuel cell and electricity generation performance

以某水处理厂厌氧消化池活性污泥为接种体,间甲酚模拟废水为阳极液,构建了厌氧流化床单室无膜空气阴极微生物燃料电池(AFB-SMFC)。研究了开路和闭路操作条件下间甲酚的降解性能及其动力学,探讨了电化学作用与微生物降酚能力之间的关系,考察了外电阻、间甲酚浓度对AFB-SMFC降酚及产电性能的影响。结果表明:AFB-SMFC在闭路条件下的平均降酚速率为15.29 mg/(L·h),比开路条件(11.18 mg·L^(-1)·h^(-1))下提高了37%;闭路和开路条件下间甲酚降解反应均遵循零级动力学方程:-d St/dt=k;当外电阻为5 000Ω时,电池的产电性能最好,而外电阻为1 000Ω时间甲酚的去除率最高;当间甲酚初始浓度为570~630 mg/L时,AFBSMFC的产电性能和降酚效果俱佳,最大功率密度为324.4 m W/m^2,间甲酚去除率为96.2%。

Anaerobic fluidized bed single-chamber membrane-less air-cathode microbial fuel cell（AFB-SMFC） was built using m-cresol wastewater as anolyte, using anaerobic activated sludge as inculum, which came from a sewage treatment plant. The properties and kinetics of m-cresol degradation under open circuit and closed circuit operating conditions were investigated. The relationship between the electrochemical action and the microbic degradation ability was discussed. Meanwhile, the effects of external resistance and m-cresol concentration on the degradation of m-cresol and electricity generation performance were studied. The results showed that m-cresol removal rate in the closed-circuit AFB-SMFC was 15.29 mg/（L·h）, which was 37%higher than the value（11.18 mg·L^-1·h^-1）of the open-circuit control. The degradation of m-cresol followed zero-order kinetic equation：-d St/dt =k. The electricity generation capacity was the best when the external resistance was 5 000 Ω. And the highest removel of the m-cresol was appeared when the external resistance was 1 000 Ω. When the initial concentration of m-cresol was in the ranged of 570 mg/L to 630 mg/L, the electricity generation and m-cresol removal were both excellent, the maximum power density was 324.4 m W/m^2 and the m-cresol removal was 96.2%.