豫西农村生活污水处理系统净化效果研究

Rural Domestic Wastewater Treatment Systemand Purification Effect in Western Henan Province

豫西是黄河流域典型的干旱区,水资源严重匮乏,农村生活污水处理后资源化利用,不仅能够提高水资源利用率,而且能够减轻农村水体污染。设计了一套农村生活污水处理系统,并研究了不同水力停留时间对系统脱氮除磷和COD去除的影响。结果表明:水力停留时间为18、24 h时,氨氮平均去除率差异较大,总氮、磷酸盐和COD去除率相差较小;当水力停留时间为24 h时,系统对氨氮、总氮、磷酸盐、COD的平均去除率分别为63.09%、65.41%、62.83%、75.31%,且系统运行较为稳定,故24 h为污水处理系统较优的水力停留时间。

Western Henan is a typical arid area of the Yellow River Basin and there is seriously short of water resources.The utilization of rural domestic sewage after treatment can not only improve the utilization rate of water resources,but also reduce the pollution of rural water bodies.This paper introduced the rural domestic sewage treatment system in detail,and studied the influence of two kinds of hydraulic retention time(HRT)to the system’s removal of nitrogen,phosphorus and COD.The results show that the average removal rate of ammonia nitrogen varies greatly with different hydraulic retention time,while the removal rate of the remaining indicators differs by less than 1%.When the hydraulic retention time is 24 h,the average removal rates of ammonia nitrogen,total nitrogen,phosphate and COD are 63.09%,65.41%,62.83%and 75.31%respectively and the system runs more stably.Therefore,24 h can be used as the best hydraulic retention time of sewage treatment system.