水力停留时间对生物电化学系统性能影响研究

The Influence of HRT on Performance of Bioelectrochemical System

采用电极生物电化学系统（BES）处理模拟城镇废水,研究水力停留时间分别为6h、12h、18h和24 h时,BES反应器对于废水中COD、氨氮、总氮去除效果及其产电性能.实验发现：综合考虑BES系统去除污染物性能和产电性能,最佳水力停留时间为12～18h;随着水力停留时间的增加,BES反应器对COD去除效果先增加后逐渐趋于稳定,NH4＋-N和总氮的去除率变化不大;BES反应器对COD、NH4＋-N和总氮的去除率最高可达92.1％、99.3％和98.8％;在阴极和阳极间500Q电阻两端最高可以产生98 mV电压,电压和COD的处理效果有一定联系.

The bioelectrochemical system （BES） was used to treating simulated municipal wastewater. We examined the removal rate of BES for wastewater chemical oxygen demand（COD）, ammonia nitrogen（NH4^＋-N）, total uitrogen（TN） and electricity production performance when the hydraulic retention time （HRT）was 6 h, 12 h, 18 h and 24 h. It was found that： the optimum HRT was 12-18 h when considered the electricity generation performance and properties to removal of pollutant of BES synthetically; with the HRT increased, the cod removal rate increased and then gradually stabilized, the removal rate of NH4^＋-N and TN changed little; the removal rate of COD, NH4^＋-N and TN were up to 92.1%, 99.3 % and 98.8 %; the system produced up to 98 mV of electrical potential across a 500-ohm resistor. The voltage and treatment effect of COD have some contact.