沉积型微生物燃料电池处理含铜废水及产电性能

THE USE OF SEDIMENT MICROBIAL FUEL CELL FOR TREATING COPPER CONTAINING WASTEWATER AND ELECTRICITY PRODUCTION

实验构建沉积型微生物燃料电池(sediment microbial fuel cell,SMFC),以有机废水为阳极底物,以活性污泥中的混合菌为阳极接种微生物,以含铜废水为阴极液,探讨SMFC对产电性能及废水处理的影响规律。结果表明:当阴极液Cu SO4浓度为3 000 mg/L时,SMFC的产电性能最优,功率密度最大为81.7 m W/m2,电流密度最大为980.0 m A/m2,优于浓度为1 000 mg/L和5 000 mg/L时的SMFC的产电性能。SMFC能有效处理有机废水和含铜废水,SMFC对有机废水COD去除率最高可达74.3%;SMFC对Cu2+的去除率最高可达到96.6%。SMFC可回收铜,阴极板上的沉积物经XRD检测,为Cu2O和单质铜的混合物。利用扫描电镜观察其表面形貌主要为片状和树枝状,铜粉的平均粒径为2.1μm。

Organic wastewater was used as anode substrate,mixed bacteria in activated sludge was used as anode microbial inoculation,copper-contained wastewater was used as catholyte. Sediment microbial fuel cell( SMFC) was constructed. The effects of SMFC on the electricity generation capacity of MFC and wastewater treatment were studied. The results show that electricity production performance of the SMFC with 3 000 mg / L Cu SO4 solution using as catholyte is optimal,the maximum power density of which was 81. 7 m W / m2,and the maximum electric current density of which was 980. 0 m A/m2,better than1 000 mg / L and 3 000 mg / L. The SMFC could treat organic wastewater and copper-contained wastewater effectively,SMFC for organic wastewater COD removal rate as high as 74. 3%; and the removal rate of copper was 96. 6%. The SMFC could recycle copper,sediment on MFC cathode plate was mixture of Cu and Cu2 O. Using scanning electron microscope to observe sediment,surface morphology is mainly flake and dendritic. The average particle size of copper powder was 2. 1 μm.