同步产电及废水处理AFB-MFC电极研究

Electrode of AFB-MFC for Electricity Production and Wastewater Treatment

为了考察电极因素对微生物燃料电池产电及废水处理性能的影响,设计了一种新型厌氧流化床微生物燃料电池(AFB-MFC)。研究了不同阴极电极材料,阴极与阳极面积以及阴极底边与阴极室底部距离对AFB-MFC产电及废水处理性能的影响。所有实验在阴极室曝气量为16～24L/h、回流量为10.7L/h、进水流量为0.6L/h、外电阻为250Ω以及进水COD浓度为3000.98～3789.44mg/L下进行。结果表明,在尺寸大小均为15.0cm×3.5cm的碳纸、铜板、铝板、镀锌铁板及铁板中,使用碳纸作阴极电极时AFB-MFC产电性能最好;阴极底边与阴极室底部的最佳距离为17.3～20.3cm;使用面积为308.8、232.0、160.0和76.8cm2的碳纸作阳极电极及面积为241.5、210.0、175.0和105.0cm2碳纸作阴极时,阳极及阴极最佳面积分别为160.0和210.0cm2。AFB-MFC系统最佳运行条件下COD的去除率维持在约80.00%。放大型AFB-MFC系统有利于今后工程实际应用。

In order to investigate the effects of electrode factors on electricity production and wastewater treatment in microbial fuel cell,a new anaerobic fluidized bed microbial fuel cell （AFB-MFC） was designed.The effects of various cathodes made from different materials,areas of cathode and anode,the distance between the bottom of cathode and the bottom of cathode chamber on the performance of electricity production and wastewater treatment in AFB-MFC were studied.All experiments were operated at the conditions with the aeration rate of 16 ～ 24 L/h in cathode chamber,the recirculation flow of 10.7 L/h,the influent flow of 0.6 L/h,the external resistance of 250 Ω and the COD concentration of 3000.98 ～ 3789.44 mg/L in influent.It was found that carbon paper was the best one for cathode among carbon paper,copper,aluminum,galvanized iron and iron,all having a size of 15.0 cm × 3.5 cm.The optimum distance between the bottom of cathode and the bottom of cathode chamber was 17.3 ～20.3 cm.The optimal anode area was 160.0 cm^2 when carbon papers with an area of 308.8,232.0,160.0 and 76.8 cm^2 were used for anode.The best cathode area was 210.0 cm^2 when carbon papers with an area of 241.5,210.0,175.0 and 105.0 cm^2 were served as cathode.About 80.00% of COD could be efficiently removed under the optimal operation conditions for AFB-MFC system.The AFB-MFC system which was scaled up is conducive to the practical engineering application in the future.