Municipal wastewater treatment system

Abstract

The invention discloses a municipal wastewater treatment system. According to key points of the technical scheme, the municipal wastewater treatment system comprises an aeration tank and a sedimentation basin, wherein an aeration system is mounted in the aeration tank and comprises a sealing plate mounted at an opening of the aeration tank; rotatable aeration assemblies are mounted between the sealing plate and the bottom of the aeration tank; the aeration assemblies are uniformly distributed in the aeration tank; the aeration assemblies comprise hollow shafts; rotating shaft seats are mounted at the bottoms of the sealing plate and the aeration tank; the hollow shafts are rotationally connected to the rotating shaft seats; the hollow shafts are uniformly connected with a plurality of aerator pipes along the height direction; and the aeration system further comprises a driving mechanism used for driving the hollow shafts to rotate and an air-blowing pressurization mechanism communicated with the hollow shafts. According to the municipal wastewater treatment system disclosed by the invention, a dissolution effect of oxygen and sewage in an activated sludge process can be effectively enhanced, and the aeration effect is improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, more specifically it relates to a municipal sewage treatment system. Background technique [0002] Municipal sewage is the general term for urban sewage, and urban sewage includes domestic sewage and industrial sewage. For the discharge of industrial sewage, the state has formulated relevant standards, requiring enterprises that produce a large amount of sewage to have sewage treatment capabilities, and discharge can only be carried out after reaching the discharge standard. ; But there is no relevant standard for domestic water; domestic sewage is mainly processed by sewage treatment plants; because domestic sewage contains a large amount of organic matter, activated sludge method is generally used in the prior art for processing. [0003] The core of the activated sludge method lies in the aeration tank and the sedimentation tank. The sewage mixed with sludge enters the aeration tank, ...

AI Technical Summary

Problems solved by technology

[0005] 1. Mechanical aeration, using the stirring effect of the impeller to fully mix the sludge and water, increase the surface water-air contact, easy to maintain, but the aeration effect is poor, usually only suitable for smaller aeration tanks

[0006] 2. Blast aeration, by installing an aeration tube or aeration disc at the bottom of the aeration tank, filling the aeration tube or aeration disc with air through a blower or an air compressor, and generating air from the aeration tube and aeration disc A large number of air bubbles, thereby increasing the dissolved oxygen concentration in the sewage; compared with mechanical aeration, it is convenient to install a larger aeration tank, but the disadvantage is that the aeration tube or aeration disc is usually installed at the bottom of the tank, and the depth is relatively deep, resulting in The pressure loss is large, and the aeration efficiency is low; after the aeration is stopped, the sludge is deposited on the bottom of the tank and attached to the aeration tube or aeration plate to cause re-aeration, the pressure in the aeration system needs to overcome the sludge pressure , resulting in increased pressure loss; in addition, the blast aeration method also has poor mixing performance between sludge and water, and is prone to problems such as dead ends

[0007] In summary, the existing aeration system still needs to be improved in terms of aeration effect

Images