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. The energy-saving urban sewage treatment system comprises an aerationtank and a sedimentation tank, wherein an aeration device is arranged in the aeration tank, and comprises a stirring mechanism and a gas transmission mechanism, the stirring mechanism comprises a small motor and a stirring shaft which is driven to rotate by the small motor, a plurality of rotating blades are integrally formed on the lateral surface of the upper end of the stirring shaft, and inclined to one side from the bottom up and inclination angles are gradually increased, and the rotating blades are inclined to the same side away from the stirring shaft. The rotating blades rotate and stir water flow to form vortex to be sprayed, so that a circular flow passage in which pool bottom water and pool surface water can continuously circulate is formed in the aeration tank, then low-oxygen content water at the pool bottom and high-oxygen content water on the pool surface circularly exchange continuously, and low-oxygen content water is stronger in capacity of dissolving oxygen, to increase the overall oxygen content. The gas transmission is realized through a gas transmission device to increase the oxygen content.

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 ...

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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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