乙酸钠为基质的微生物燃料电池产电过程

Research on electricity generation process in microbial fuel cell based on sodium acetate

以多孔碳纸为阳极,耐水性电催化材料为阴极,设计了无媒介双室微生物燃料电池(MFC).以厌氧污泥为出发菌株,乙酸钠为底物,外接一定负载条件下,进行MFC产电过程研究.分别研究进水质量浓度在800 mg/L,1200 mg/L,1600 mg/L,2000 mg/L,以及在外电阻条件为400Ω、600Ω、800Ω、1000Ω,水力停留时间48 h时,负载两端的电压、功率密度、电化学池中生物量(VSS)和出水COD的变化规律.结果表明,进水质量浓度升高时,阳极池内生物量减少,COD去除率降低,MFC功率密度提高.在进水乙酸钠质量浓度为2000 mg/L时,MFC最高功率密度为35.71 mW/m2,电流密度为345 mA/m2.外电阻阻值降低后,平均出水COD升高,MFC电流升高,阳极池微生物产电能力增强.

Taking porous carbon paper as anode and waterproof materials as cathode, a two - chambered microbial fuel cell （MFC） without electron mediator was designed, Electricity was generated across circuit resistance from sodium acetate using anaerobic sludge as microorganism source. Resistor voltage, power density, VSS and effluent Chemical Oxygen Demand （COD） were monitored and analyzed on the following conditions （HRT 48 h） ： influent concentration at 800, 1200, 1600 and 2000 mg/L of acetate and circuit resistor at 400, 600, 800, and 1000 Ω. The results showed that the power output of unit microorganism was promoted and COD removal efficiency was declined with increasing of substrate concentration, but the biomass calculated by VSS （volatile suspended solids） was decreased. A maximum power density of 35.71 mW/m^2（345 mA/m^2; current density） was reached at sodium acetate concentration of 2000 mg/L. Moreover, both the effluent COD and the circuit current of MFC increased when resistance decreased. It meant that the electricity generation ability of microorganism in anode was promoted