Sewage treatment system and sewage treatment method

Abstract

The invention creatively relates to a sewage treatment system and a sewage treatment method. According to the adopted technical scheme, the sewage treatment system is composed of a flocculation tank and a sedimentation tank. According to the flocculation tank, a sewage inlet and a reaction water outlet are formed in a tank body I, and three baffle plates I are arranged in the tank body I to sequentially divide the interior of the tank body I into a cavity I, a cavity II, a cavity III and a cavity IV. According to the sedimentation tank, a reaction water inlet is formed in a tank body II, and three baffle plates II are arranged in the tank body II to divide the interior of the tank body II into a baffling area and a sedimentation area; a polyacrylamide inlet is formed in the baffling area, a sludge hopper is arranged at the lower end of the sedimentation area, a sludge discharging pipe is arranged at the lower end of the sludge hopper, a water distribution plate with a great number of water distribution holes is mounted at the upper end of the sludge hopper, a plurality of inclined plates are mounted on the water distribution plate, and a water drainage outlet is formed in the tank body II. According to the sewage treatment system and the sewage treatment method, the principle of sedimentation and air floatation is adopted, the efficiency of solid-liquid separation is improved to the greatest extent, and the final quality of drained water which is treated is guaranteed.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a sewage treatment system and treatment method. Background technique [0002] In the mechanical processing industry, especially in the process of surface treatment, a large amount of industrial wastewater will be generated. If these industrial wastewater is not treated in time, it will cause serious pollution to the environment. In the prior art, most of the chemical treatment methods are used, and the existing problems are: ①Because the dosing amount cannot be absolutely suitable, a small part of the heavy metal salt will not be flocculated or coagulated, so it is still in the form of tiny particles suspended in the water , it is difficult to overcome the buoyancy of water and settle down. ② Although some metal salts are flocculated or coagulated, the particles are small, the specific gravity difference relative to water is small, and the speed of downward precipitat...

AI Technical Summary

Problems solved by technology

In the prior art, most of the chemical treatment methods are used, and the existing problems are: ①Because the dosing amount cannot be absolutely suitable, a small part of the heavy metal salt will not be flocculated or coagulated, so it is still in the form of tiny particles suspended in the water , it is difficult to overcome the buoyancy of water and settle down

② Although some metal salts are flocculated or coagulated, the particles are small, the specific gravity difference relative to water is small, and the speed of downward precipitation is slow. Suspended in water and drained

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