Multi-stage biological contact oxidation process with multi-point influent for rural domestic sewage treatment
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,NH4+-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"(DB11/1 612-2019).
rural domestic sewagebiological contact oxidationmulti-point water inletnitrogen removalhydraulic retention time
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