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Abstract
The design of urban sewage treatment plant in Jiangning.the treatment object is urban sewage, and the recent amount of water is 90000m3 and the forward amount of water is 135000m 3. The water quality are: COD:380 mg / L, BOD:150 mg / L, SS:140 mg / L, NH+4-N:32mg/L, TN:40 mg / L, TP:5 mg / L.the treated sewage must achieve \treatment plant pollutant discharge standard\
This design adopts activated sludge process for treatment of urban sewage,and the design requirements are to remove nitrogen and phosphorus of urban sewage. Through comparative analyses, this design selects the carrousel 3000 type oxidation ditch process. In the design, the sludge stabilization is required for oxidation ditch, so the sludge process in this design does not need to achieve digesting stabilization. so it only needs to be treated by sludge. The waste water treatment process are: water, fine grille, sinking sand pool, Carrousel 3000 oxidation ditch, final settling tank, disinfection pool, water contact. The sludge treatment process are: the concentrated pool, mud storage, dewatering room, sludge sinotrans.
This design completed the calculation of the design, layout and elevation calculation of sewage treatment plant, and sewage disposal plant general layout, elevation layout, layout of main construction material on detail structure of sewage treatment plant.
Keyword:City sewage, sewage treatment, Carrousel 3000 oxidation ditch, sludge treatment
II
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