Biological purification tank used for sewage treatment

Abstract

The invention provides a biological purification tank used for sewage treatment. The biological purification tank used for the sewage treatment comprises an inner-layer tank body, a middle-layer tankbody, an outer-layer tank body, a water inlet pipe, a water outlet pipe, a gas stripping return pipe, an aerator pipe and a gas inlet pipe. According to the biological purification tank, sewage entersthe biological purification tank from bottom of an anaerobic region and flows upward, then enters an aerobic region from a deflector hole and flows downward and then enters a settling zone and then flows upward, finally purified water flows out from the water outlet pipe, the sewage advances in an up-down bending-flow manner in the biological purification tank, stroke is long, retention time of hydraulic power is long, water flow direction in an aeration zone is opposite to aeration airflow direction, a contact surface between an aqueous phase and a gas phase is larger, and aeration is more uniform; the three tanks are concentrically sheathed and stacked together and are vertical tank bodies, so that occupying area is smaller than that of other types of sewage equipment after the biological purification tank is buried underground; and the biological purification tank provided by the invention is small decentralized sewage treatment equipment applicable to a place where less amount ofsewage is produced every day, small in occupying area, good in treatment effect, easy to operate and low in power consumption.

Description

technical field [0001] The invention relates to the technical field of sewage treatment equipment, in particular to a biological purification tank for sewage treatment. Background technique [0002] In most rural areas of China, farmers live scatteredly, and the sewage pipe network is not perfect. A large amount of domestic sewage from villages and towns is directly discharged into surrounding water bodies without treatment, resulting in eutrophication of water bodies. For the small amount of sewage generated every day by rural single-family, multi-family sewage and farmhouses in tourist attractions, the market needs a small-scale decentralized sewage treatment equipment that occupies a small area, has good treatment effects, is easy to operate, and consumes less power. [0003] At present, the commonly used sewage treatment methods in rural China are: (1) septic tanks, which only play the role of sedimentation and corrosion, and basically have no degradation effect on pollu...

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Problems solved by technology

[0003] At present, the commonly used sewage treatment methods in rural China are: (1) septic tanks, which only play the role of sedimentation and corrosion, and basically have no degradation effect on pollutants; (2) constructed wetlands, which can play a certain degradation role in the initial stage of construction. It is easy to block after several years of use, and the water outlet effect is even worse when the plants wither or grow poorly in winter; (3) Based on the traditional structure of biological contact oxidation sewage treatment equipment, the reaction pools are connected in series, which occupies a large area and consumes a lot of energy. (4) Sewage treatment equipment based on MBR membranes has a good treatment effect, but high energy consumption, requires professionals to wash and replace membrane components, and is basically not suitable for rural sewage

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