Biochemical sewage treatment system and sewage treatment method thereof

Abstract

The invention discloses a biochemical process sewage treatment system and a sewage treatment method thereof, the sewage treatment system comprises a sewage collection tank, a first dosing pipeline and a second dosing pipeline which are arranged in parallel, a clarification tank, a biochemical tank, a sludge blending tank, a first sedimentation tank, a second sedimentation tank, a third sedimentation tank and a third sedimentation tank. A first delivery pump and a first pipeline mixer are arranged on the first dosing pipeline, a second delivery pump and a second pipeline mixer are arranged on the second dosing pipeline, and a series branch is arranged between an outlet of the first delivery pump and an inlet of the second delivery pump or between the inlet of the first delivery pump and an outlet of the second delivery pump. A branch control valve is arranged on the series branch; according to the biochemical sewage treatment system and the sewage treatment method thereof, pressurized conveying can be realized when the caliber of the conveying pipe is reduced, and sludge is discharged by the tertiary sedimentation tank according to a siphon principle, so that the disturbance to the sludge in a sludge discharging process is greatly reduced, and the sludge sedimentation quality of the tertiary sedimentation tank and the effluent reaching the standard are ensured.

Description

technical field [0001] The invention relates to a biochemical sewage treatment system and a sewage treatment method thereof, which are used for treating sewage. Background technique [0002] In the process of sewage treatment, the sewage goes through the sewage collection tank, the clarification tank, the biochemical tank, the primary settling tank and the secondary settling tank, and then enters the tertiary settling tank. Sedimentation will occur again in the settling tank. At this time, the settled sludge is not as viscous as the primary and secondary settling tanks. The current tertiary settling tank mainly includes the tank body. A rotating frame is installed on the tank body. The lower end of the rotating frame A mud scraper is fixed, and the mud scraper scrapes the sludge at the bottom of the tertiary settling tank to the sludge outlet during the rotation process, and then is discharged through the sludge outlet. However, the mud scraper will disturb the sludge at th...

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Problems solved by technology

However, the mud scraper will disturb the sludge at the bottom of the pool during the rotating mud scraping process. At the same time, because the mud scraper cannot completely contact with the bottom of the pool, a layer of sludge will always pile up on the bottom of the pool, especially the three sedimentation The sludge at the bottom of the tank is relatively thin, so the disturbance is more severe, which affects the sedimentation quality of the three settling tanks, and may cause the COD of the water discharged from the three settling tanks to exceed the standard

[0003] In addition, flocculants need to be added during the process of sewage entering the clarification tank from the sewage collection tank, so that the particles in the sewage will flocculate into sludge, and the sludge may adhere to the conveying pipe during the transportation process, resulting in long-term Time will easily lead to the reduction of the conveying diameter of the conveying pipe, which will affect the water output

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