An energy-saving urban sewage treatment system

Abstract

The invention relates to the technical field of sewage treatment, in particular to an energy-saving urban sewage treatment system. An energy-saving urban sewage treatment system, including an aeration tank and a sedimentation tank, an aeration device is arranged in the aeration tank, the aeration device includes a stirring mechanism and an air transmission mechanism, and the stirring mechanism includes a small motor and a A small motor drives the rotating stirring shaft. The side of the upper end of the stirring shaft is integrally formed with multiple rotating vanes. The rotating vanes are inclined from bottom to top to one side and the inclination angle gradually increases. The rotating vanes move toward the direction away from the stirring shaft. Same side slant. The rotary vane rotates and stirs the water flow to form a vortex jet, so that the bottom water and the surface water of the pool can be continuously circulated in the aeration tank, so that the low oxygen content water at the bottom of the pool and the high oxygen content water on the pool surface are continuously With cyclic exchange, the oxygen-dissolving capacity of low-oxygen water is stronger, so the overall oxygen content increases. The oxygen content is further increased by gas transmission through the gas transmission device.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an energy-saving urban 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, and ...

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] The above reasons will lead to the weakening of the ability of the aeration tank to decompose organic matter

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