Experimental Study on Degradation of Rural Domestic Sewage by Tertiary AO Biological Contact Oxidation Process
In order to reduce the operating cost of rural wastewater treatment,the optimal operating conditions that are most suitable for rural wastewater treatment are investigated.The experiment uses three-stage AO contact oxidation process to treat rural domestic wastewater,and applies natural water fall to supplement dissolved oxygen,and the influence factors of water fall are studied experimentally.Results show that the average removal rate of COD is 88.98%,the average removal rate of ammonia nitrogen is 83.56%and the average removal rate of total phosphorus is 77.78%at the ambient temperature of 24～30℃,pH 7～8,dissolved oxygen is 3.0～3.5 mg/L,the auxiliary aeration is 500 L/h and the optimal hydraulic retention time is 6 h.The average COD removal rate of the three-stage biological contact oxidation process is derived by combining the Box-Behnken response surface model with the primary standard of the Hebei Province"Rural Village Domestic Sewage Discharge Standard"(DB13/2171-2020).
rural domestic sewagecontact oxidation processwater drop aerationthree-stage reactorresponse surface model
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