Dissolved-oxygen control strategy of AAO process for rural sewage with alternating long/short HRT mode
Fluctuation in water drainage can cause change in hydraulic retention time(HRT)during the treatment process,of rural sewage.This can ultimately lead to poor sewage treatment efficiency of the sewage system.To address this issue,an investigation was conducted on the optimal dissolved oxygen(DO)concentration and the relationship between HRT and DO in alternating long/short HRT mode using anaerobic-anoxic-oxic(AAO)sewage treatment system.The study proposed an optimal DO control strategy for sewage treatment of rural sewage..According to the study,the system was most effective in removing pollutants when the dissolved oxygen(DO)was maintained in 1 mg·L-1.The effluent chemical oxygen demand(COD)and total nitrogen(TN)concentrations were measured at 14.88 mg·L-1 and 10.15 mg·L-1,respectively.The removal rates for COD and TN were 92％and 64％,respectively.The HRT had a direct impact on the DO levels in the aerobic zone,resulting in a reduction of rate and energy consumption by 73％and 67％for when controlling DO levels at different HRTs while ensuring the effluent quality.These findings provide valuable technical support for optimizing the operation and enhancing the quality of AAO sewage treatment system for rural areas.
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