不同电子受体微生物燃料电池处理含DCB废水试验

Study on DCB Wastewater Treatment in Microbial Fuel Cells by Using Different Electron Acceptors

以碳刷为电极,分别采用高锰酸钾和铁氰化钾为阴极电子受体,构建双室型化学阴极微生物燃料电池(MFC),并以3,3′-二氯联苯胺(3,3′-dichlorobenzidine,DCB)和葡萄糖为共基质,研究DCB的降解特性及MFC的产电性能。结果表明:当电子受体浓度为500mg/L,DCB浓度50mg/L时,以高锰酸钾和铁氰化钾分别为电子受体的MFC最大开路电压相应达到741.1mV和277.2mV;MFC的输出电压随电子受体浓度的增大而增大;当外接电阻1 000Ω,DCB浓度为100mg/L时,两种电子受体的MFC均能获得最大输出电压,其中高锰酸钾阴极MFC为426.1mV,铁氰化钾阴极MFC为225.7mV,过高的DCB浓度会抑制MFC的产电效果;两种电子受体的MFC在49h内对DCB去除率均可达到70%左右。

For studying the degradation characteristics of I）CB and electricity production, the dual chamber microbial fuel cells（MFC） was constructed by using carbon brush as electrodes, potassium permanganate and potassium ferricyanide respectively as cathodic electron acceptor, with DCB and glucose as co-substrate in this paper. The experimental resuits show that, when the concentration of electron acceptors is 500 mg/L, the DCB concentration is 50 mg/L, and the MFC maximum open-circuit voltage is up to 741.1 mV and 277. 2 mV, respectively, with potassium permanganate and potassium ferricyanide as electron acceptors; the MFC output voltage increases with the concentration of electron accep- tors; when the external resistor is 1000 Ω, the DCB concentration is 100 mg/L, the maximum output voltage of MFC with potassium permanganate and potassium ferricyanide are 426. 1 mV and 225.7 mV, respectively, and the power gen- eration of MFC is inhibited by high concentration of DCB; the removal rate of DCB is about 70% in this two kinds of electron acceptors＇ MFC within 49 h.