Municipal sewage treatment system

Abstract

The embodiment of the invention discloses a municipal sewage treatment system, which comprises a pre-sedimentation tank; an aeration tank connected with the pre-sedimentation tank, wherein a liftableand rotatable aeration device is arranged in the aeration tank; a sedimentation tank connected with the aeration tank; a sludge treatment unit, wherein the sludge treatment unit comprises a sludge circulating pipeline for enabling most active sludge in the sedimentation tank to reflux into the aeration tank and a sludge discharging pipeline for discharging the residual sludge in the sedimentationtank; an anaerobic fermentation tank for receiving the sludge of the pre-sedimentation tank and the sludge discharge pipeline and carrying out anaerobic fermentation to generate biogas; and a heat preservation and heating unit for supplying the heat generated by biogas combustion to the aeration tank so as to heat. According to the embodiment of the invention, the residual sludge in the sedimentation tank is discharged into the anaerobic fermentation tank and is subjected to anaerobic fermentation to generate biogas, and the aeration tank is heated in winter by using the biogas as the heatingenergy source, so that the influence on the activity of microorganisms by the too low temperature in the aeration tank is avoided, and the secondary utilization of the sludge is realized.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of sewage treatment, and in particular 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 ...

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Problems solved by technology

[0005] For this reason, the embodiment of the present invention provides a municipal sewage treatment system to solve the problem in the prior art that the temperature of the aeration tank is too low in winter to affect the normal activities of aerobic activated sludge microorganisms, and the construction of thermal insulation workshops and the high cost of electric heating

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