电极间距对单室微生物燃料电池处理老龄垃圾渗滤液性能的影响

EFFECT OF ELECTRODE SPACING ON POLLUTIONS DISPOSAL IN AGED LEACHATE AND ELECTRICIRY PREODUCTION BY SINGLE-CHAMBER MEMBRANE-LESS AIR-CATHODE MFC

以体积分数为60%的老龄垃圾渗滤液为单室无膜空气阴极微生物燃料电池底物,考察电极间距分别为1、2、3、4、5 cm时电池产电性能及底物中物污染物的去除效果。结果表明,间距为2 cm时输出电压和最大功率密度最大,间距为4 cm时输出电压和最大功率密度最小;电极间距为1~3 cm时电池内阻随电极间距的增大而增大,而电极间距大于3 cm时电池内阻随电极间距的增大而减小。电极间距为2 cm时,微生物燃料电池(MFC)对老龄垃圾渗滤液中化学需氧量(COD)和氨氮去除率最高;5个电池的库伦效率分别为35.6%、27.6%、35.4%、14.9%和14.9%,单室无膜空气阴极MFC可在一定程度上提高老龄垃圾渗滤液的可生化性。

The aging landfill leachate with a volume fraction of 60%was used as substrate of the single-chamber membrane-less air cathode microbial fuel cells,and the pollutions’disposal efficiency and electricity production were studied when the electrode spacing(ES)was 1 cm,2 cm,3 cm,4 cm and 5 cm,respectively.The results showed that the output voltage and power density of MFC with 2 cm ES were the largest,and those of MFC with 4 cm ES was the lowest.But generally speaking,the effect of ES on the output voltage was not obvious.The internal resistance of MFC increased with the increase of ES as ES was 1-3 cm,but decreased as ES was 3-5 cm.The removal rates of COD and ammonia nitrogen in substrate were the largest as the ES was 2 cm.Coulomb efficiency of 5 microbial fuel cells were 35.6%,27.6%,35.4%,14.9%and 14.9%,respectively.The single-chamber membrane-less air cathode MFC can improve the biodegradability of the aged landfill leachate to a certain extent.