Sectionalized sewage treatment tank using cyclic activated sludge system
A technology for circulating activated sludge and sewage treatment pools, applied in water/sludge/sewage treatment, biological water/sewage treatment, sustainable biological treatment, etc., can solve high energy consumption, low nitrogen and phosphorus removal efficiency, etc. problems, to achieve the effect of improving phosphorus removal and high biological phosphorus removal efficiency
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Embodiment 1
[0022] A university park is designed to use the partitioned circulating activated sludge method of the present invention to treat domestic sewage in the campus area. The reaction pool is 24m long, 8m wide, 5.5m deep, and has a total volume of 1056m 3 , the volumes of pre-anaerobic zone 3 and anaerobic zone 4 are 88m3 respectively, the volume of anoxic zone 5 is 176m3, the volume of aerobic zone 6 is 704m3, the sum of anaerobic zone and anoxic zone and the volume of aerobic zone The ratio is 1:2, and the anoxic zone 5 adopts figure 2 In the shown discrete structure, the anoxic zone is formed by two reaction pools, and each of the four reaction pools in the anaerobic zone and the anoxic zone is equipped with one agitator with a power of 0.5KW. The COD concentration of sewage entering the treatment system is 300-500mg / L, the total nitrogen is 40-60mg / L, and the total phosphorus is 3-6mg / L. The COD concentration of the treated effluent is 30-50mg / L, the total nitrogen is 10-15mg...
Embodiment 2
[0024] The design of a sewage treatment plant adopts figure 1 The shown circulating activated sludge process (CASS) treats municipal sewage, and the volume ratio of the designed anaerobic zone 4 and aerobic zone 6 is 1:8. The COD concentration of urban sewage entering the treatment system is 300-500mg / L, the total nitrogen is 40-60mg / L, and the total phosphorus is 3-6mg / L. Since the returned sludge contains a large amount of nitrate, the concentration of nitrate in the anaerobic zone is maintained at about 3mg / L, almost no phosphorus is released, the concentration of COD in the effluent after treatment is 30-50mg / L, and the total nitrogen is 15. ~20mg / L, total phosphorus 1~2mg / L, which can only meet the secondary standard of the national urban sewage treatment plant pollutant discharge standard GB18918-2002.
[0025] Adopt the structure ( image 3) for transformation, the volume ratio of the sum of the transformed anaerobic zone 4 and anoxic zone 5 to the aerobic zone 6 is 1...
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