湿地型微生物燃料电池处理废水及同步产电研究

Study on wastewater treatment by wetland type microbial fuel cell and simultaneous electricity generation

利用芦苇构建单室湿地阴极型升流式微生物燃料电池(microbial fuel cell-constructed wetland,MFC-CW),研究阴极基质材料的种类、粒径及进水COD浓度对MFC-CW的产电和污水净化性能的影响。结果表明,阳极基质材料为2~4 mm颗粒活性炭,阴极基质材料为4~8 mm颗粒石墨时,电池性能最佳,最大输出电压为318 m V(外电阻为1 000Ω),最大功率密度达到0.197 W/m^3,库伦效率为2.1%。阴极基质材料的种类和粒径对MFC-CW的污水净化性能的影响较小,COD去除率均在80%左右。进水COD浓度是影响MFC-CW运行性能的一项重要参数,系统输出功率密度及COD去除率均随进水COD浓度的增加呈现先上升后下降的趋势,当进水COD浓度在200~300 mg/L时系统整体运行性能最佳。

A single-chamber wetland biocathode type microbial fuel cell （MFC） is constructed by means of reed in order to study the effects of cathode substrate materials and influent COD concentration on its power generation and wastewater treatment performance.The results indicate that species and particle size of the cathode substrate materials have a great effect in electricity generation performance of MFC.The maximum output voltage, the maximum power density and Kulun efficiency are 318 mV （external resistance of 1 000 Ω） ,0. 197 W/m^3 and 2. 1% respectively when the anode substrate materials are granular activated carbon （2-4 mm） and the cathode substrate materials are granular graphite （4 -8 mm）.Besides, species and particle size of the cathode substrate materials have little effect on wastewater treatment performance of MFC-CW.The removal rate of COD is about 80%.Furthermore, the influent COD concentration is a crucial operating parameter of MFC.The output power density and COD removal rate show a tendency of increasing at first and then decreasing with the growth of influent COD concentration, and the system will perform the best when influent COD concentration is in the range of 200-300 mg/L.