Sedimentation tank for sewage treatment

Abstract

A sedimentation tank for sewage treatment comprises an aerobic tank and a sedimentation tank body, the sedimentation tank body is arranged in the aerobic tank and is divided into a water inlet flow guide area and a sedimentation separation area, the sedimentation separation area is divided into a concentration area, a buffer area and a clear water area from bottom to top, and a water collecting tank is arranged in the clear water area, discharges water through a water outlet pipe and is controlled by a water outlet control valve to be opened and closed. A filler filtering layer is arranged atthe upper part of the buffer area, a sludge outlet is formed in the bottom of the concentration area, the bottom of the sedimentation tank is communicated with the bottom of the secondary aerobic tank, and a reflux treatment device for refluxing to other tanks in the sewage treatment device is arranged at the bottom of the secondary aerobic tank. The sedimentation tank has the advantages that 1) sludge backflow and mixed liquid backflow can be simplified into one path of mixed liquid backflow, biochemical reaction and mud-water separation are synchronously carried out, sludge backflow naturally flows back into a biochemical area only by virtue of gravity, an independent sludge backflow system is not needed, and relatively high activated sludge concentration of the aerobic tank can be maintained; and 2) the sedimentation tank disclosed by the invention has sludge sedimentation and effluent filtering functions at the same time.

Description

technical field

[0001] The invention relates to a sedimentation tank for sewage treatment. Background technique

[0002] The sedimentation tanks installed in the existing sewage treatment devices mainly adopt vertical flow sedimentation tanks and inclined plate sedimentation tanks, which occupy a large area. There is also the problem of floating mud, which seriously affects the quality of the effluent, and the SS value of the effluent is difficult to meet the requirements. It is also set up separately from the biochemical treatment tank and needs to be closely coordinated with the sludge return system so that too much sludge at the bottom of the sedimentation tank will affect the effluent SS. Contents of the invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a sedimentation tank for sewage treatment, which has simplified structure and good separation effect.

[0004] ...

Examples

Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawings and embodiments.

[0025] A sewage treatment device, comprising an anaerobic pool 1, a primary anoxic pool 2, a primary aerobic pool 3, a secondary anoxic pool 4, a secondary aerobic pool 5, a sedimentation tank 6, and a primary anoxic pool 2 , first-level aerobic tank 3, second-level anoxic tank 4, and second-level aerobic tank 5 pass through the first-level anoxic zone intake valve 71, the first-level aerobic zone intake valve 72, and the second-level anoxic zone intake valve respectively. The valve 73 and the air intake valve 74 in the secondary aerobic zone control the air supply to the bottom of each zone through the air pump 7, and the water inlet pipe 11 supplies water to the anaerobic pool 1 through the pipeline, and the water intake is controlled by the anaerobic zone water inlet control valve 111; The bottom of the primary aerobic tank 5 supplies the mixed liquid to...

technical field

[0001] The invention relates to a sedimentation tank for sewage treatment. Background technique

[0002] The sedimentation tanks installed in the existing sewage treatment devices mainly adopt vertical flow sedimentation tanks and inclined plate sedimentation tanks, which occupy a large area. There is also the problem of floating mud, which seriously affects the quality of the effluent, and the SS value of the effluent is difficult to meet the requirements. It is also set up separately from the biochemical treatment tank and needs to be closely coordinated with the sludge return system so that too much sludge at the bottom of the sedimentation tank will affect the effluent SS. Contents of the invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a sedimentation tank for sewage treatment, which has simplified structure and good separation effect.

[0004] ...

Examples

Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawings and embodiments.

[0025] A sewage treatment device, comprising an anaerobic pool 1, a primary anoxic pool 2, a primary aerobic pool 3, a secondary anoxic pool 4, a secondary aerobic pool 5, a sedimentation tank 6, and a primary anoxic pool 2 , first-level aerobic tank 3, second-level anoxic tank 4, and second-level aerobic tank 5 pass through the first-level anoxic zone intake valve 71, the first-level aerobic zone intake valve 72, and the second-level anoxic zone intake valve respectively. The valve 73 and the air intake valve 74 in the secondary aerobic zone control the air supply to the bottom of each zone through the air pump 7, and the water inlet pipe 11 supplies water to the anaerobic pool 1 through the pipeline, and the water intake is controlled by the anaerobic zone water inlet control valve 111; The bottom of the primary aerobic tank 5 supplies the mixed liquid to...

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