A sewage treatment system

Abstract

A sewage treatment system comprises a biological reaction zone and a precipitate separation zone. A drop driving biofilm treatment device is arranged above the biological reaction zone, a plurality of slurry plates, which are located below the sewage pipes, are arranged on the rotating shaft of the drop driving biofilm treatment device, a plurality of biofilm bearing discs are also located in the rotating shaft, a part of the biofilm bearing discs are immersed below the liquid level. The sewage treatment system provided by the invention utilizes the energy generated by allowing the sewage to enter the pool to drive a waterwheel type slurry plates in water dropping manner to rotate with the rotating shaft so that the biofilm bearing discs operates and the sewage is subjected to aeration. When sewage overflows from the slurry plates, the contact surface with air is further increased, thus further aeration is carried out. The loop process of anaerobic, anoxic and aerobic processes, etc., are carried out in the biological reactor at different times by automatically controlling the flowing time of sewage to achieve good water treatment effects.

Description

technical field [0001] The invention relates to the field of environmental protection, and is mainly used for domestic sewage treatment projects, in particular a sewage treatment system and a multi-stage multiphase flow aeration mixing device suitable for small and medium-sized domestic sewage treatment plants. Background technique [0002] At present, domestic and foreign domestic sewage mainly adopts biological treatment methods. Biological treatment mainly includes activated sludge method and biofilm method. These two main biological treatment methods are basically not used in a water treatment structure. After biological treatment of sewage, under normal circumstances, it is necessary to build a secondary settling tank to separate water and sludge. [0003] The activated sludge process generally adopts anaerobic, anoxic, aerobic and other microbial treatment processes to absorb and oxidize COD (chemical oxygen demand), nitrogen, and phosphorus in domestic sewage by utili...

AI Technical Summary

Problems solved by technology

However, because the blower aerates the pool, the air is in contact with the sewage and its microorganisms in the form of bubbles at one time, and the utilization rate of oxygen is not high; in addition, the return mixing device of sewage and sludge also needs power; therefore, conventional sewage treatment The process consumes a lot of energy, and the operating cost and construction cost are relatively high

[0007] There are also some sewage treatment plants that use jet aeration, which prolongs the contact time between sewage and air, and improves the utilization rate of oxygen to a certain extent, but the effect is not ideal enough.

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