多点进水多级生物接触氧化工艺处理农村生活污水

Multi-stage biological contact oxidation process with multi-point influent for rural domestic sewage treatment

针对农村地区生活污水的特点,设计好氧-缺氧-缺氧-好氧的多级生物接触氧化工艺,通过控制进水位置及比例、水力停留时间等参数,分别考察了单点进水和多点进水条件下生物接触氧化工艺的除碳脱氮性能。结果表明:当进水比例为好氧池1#与缺氧池1#=4:1,HRT为6.55 h时,生物接触氧化工艺出水水质最优,COD、NH_(4)^(+)-N及TN的出水平均浓度分别为20.2、0.5、9.0 mg·L^(-1),平均去除率分别为92.0%、97.1%、64.3%。出水水质达到北京市《农村生活污水处理设施水污染物排放标准》(DB11/1612-2019)》一级A标准。

According to the characteristics of rural domestic sewage,a multi-stage biological contact oxidation process including aerobic,anoxic,anoxic and aerobic processes was designed.Through controlling the parameters such as inlet position,proportion and hydraulic retention time,the carbon and nitrogen removal performance of the biological contact oxidation process under single point and multiple point inlet conditions were investigated.The results showed that when the inlet ratio of aerobic tank 1#to anaerobic tank 1#was 4:1,and HRT was 6.55 hours,the effluent quality of the biological contact oxidation process was optimal.The average values of COD,NH_(4)^(+)-N,and TN in the effluent were 20.2,0.5,and 9.0 mg·L^(-1) with the average removal rates of 92.0%,97.1%,and 64.3%,respectively.The effluent water quality meets the Grade One A-level discharge standard of the Beijing local standard“Discharge standard of water pollutants for rural sewage treatment facilities”(DB11/1612-2019).