电子受体对微生物燃料电池产电性能的影响

Effect of electron acceptors on electricity generation property of MFC

以厌氧污泥为接种菌源,醋酸钠为阳极基质,分别构建了铁氰化钾和过硫酸铵为电子受体的双室微生物燃料电池(MFC),并研究了MFC在不同电子受体下的产电性能。结果表明,以铁氰化钾和过硫酸铵为电子受体的MFC最大稳定输出电压均随着电子受体浓度的升高而增大。当铁氰化钾质量浓度大于2.0g/L时,MFC最大稳定输出电压增幅不大。两种MFC的内阻均随电子受体浓度的增大而降低。阴、阳极溶液体积相等,外阻为5 000Ω时,以10.0g/L过硫酸铵为电子受体,MFC最大开路电压和最大输出功率密度分别为1 029.0mV和385mW/m3;以10.0g/L铁氰化钾作为电子受体,MFC最大开路电压和最大输出功率密度分别为711.8mV和73mW/m3,均小于以过硫酸铵为电子受体的最大开路电压和最大输出功率密度。因此,过硫酸铵是一种理想的电子受体,能够提高MFC产电性能。

Dual-chamber microbial fuel cell （MFC） was constructed with the anaerobic sludge as inoculumsource, potassium ferricyanide and ammonium persulphate respectively as the electron acceptor and sodium acetate as the anode substrate. The electricity generation property of MFC under different electron acceptors was studied. The results showed that the maximum stable output voltage of MFC with potassium ferricyanide and ammonium persulfate as the electron acceptors respectively was enhanced with the increase of electron acceptor concentrations. When potassium ferricyanide concentration became higher than 2.0 g/L,the maximum stable output voltage of MFC almost unchanged. The internal resistance of both MFC decreased along with the increase of electron acceptor concentrations. When the solution volume of anode and cathode chambers were equal and the external resistance was 5 000 Ω,the maximum open circuit voltage and maximum output power density were 1 029.0 mV and 385 mW/m^3 respectively , with 10.0 g/L ammonium persulfate as the electron acceptor. When using 10.0 g/L potassium ferricyanide as the electron acceptor,the maximum open circuit voltage and maximum output power density were 711.8 mV and 73 mW/m^3 , respectively, which was significantly lower than the condition of using ammonium persulfate as the electron acceptor. The results indicated that ammonium persulphate was an ideal electron acceptor of MFC, which could improve the electricity generation property of MFC.