空气阴极微生物燃料电池处理模拟酸性矿井水的研究

酸性矿井水因pH值低、重金属离子含量高,难以直接采用硫酸盐还原菌生化处理.试验构建了空气阴极微生物燃料电池系统来处理酸性矿井水,有效处理废水H+和重金属离子,同时还能产电.构建的空气阴极微生物燃料电池系统(污泥量40mL,硫酸盐还原菌30mL,阳极材料为碳布,室温)的最大功率密度达到82.24mW/m2,最大电压为332.2mV;硫酸根的最大去除率达到41.6,对Zn2+、Cu2+、Cd2+和Fe2+的去除率分别达到83.7%、77.4%、84.2%和66.8%,化学需氧量的最大去除率达到60.9%.分析认为,空气阴极微生物燃料电池有效处理废水H+,弱化了H2S的生物抑制作用,强化了硫酸盐还原菌还原产生的S2-与重金属离子生成硫化物,并经能谱分析加以验证.

Study on the treatment of simulated acid mine drainage using air cathode microbial fuel cell

Acid mine drainage （AMD） with low pH and high metal ions is difficult and costly to treat by sulfate reducing bacteria . Air cathode microbial fuel cell （MFC） is constructed to treat AMD and re- move H＋. It can treat wastewater while producing electricity. The maximum power density was 82.24 mW/mz, maximum voltage was 332.2 mV; maximum removal of sulfate was 41.6%, Zn2＋, Cu2＋ , Cd2＋and Fe2＋ removal rates were 83.7%, 77.4%, 84.2% and 66.8% respectively and maximum percent removal of chemical oxygen demand （COD） 60.9% are obtained in MFC （activated sludge 40 mL, SRB 30 mL, carbon cloth as anode material, room temperature） . It is conclnded that air cathode microbial fuel cell can effectively remove H＋, weaken the inhabitation of HzS on the bacteria and strengthen the forming of sulfide using metal ions, which are tested and proved by Energy Dispersive Spectrometer （EDS）.