A district of a city plans to use the ordinary activated sludge process to treat urban sewage, with a wastewater volume

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A district of a city plans to use the ordinary activated sludge process to treat urban sewage, with a wastewater volume of 2000m3/d, a BOD5 of 300 Mg/L of the original sewage and a BOD removal rate of 30% in the primary sedimentation tank. It is required that the BOD5 of the treated effluent is 20 Mg/L. The trial design of the sewage treatment plant includes the selection of process flow, the calculation and design of aeration tank, the calculation and design of aeration system, etc. at the same time, it is also required that the plant can be easily changed to the operation of multi-point influent method and adsorption regeneration method, Please from the design Give specific measures