Sludge discharge system of secondary sedimentation tank and operation method thereof

Abstract

The invention discloses a secondary sedimentation tank sludge discharge system and an operation method thereof, belonging to the technical field of sewage treatment. The invention relates to a sludgedischarge system for a secondary sedimentation tank, which mainly consists of a sludge return well, a sludge discharge main pipe, a sleeve valve, a sludge return pipe, a venting pipe, a pump barrel, agate valve, a venting well and a drainage pipe. The operation method mainly includes opening the gate valve to reduce the liquid level in the pump barrel to below the top flange blind plate, openingthe top of the pump barrel, putting the axial flow pump or submersible pump to the bottom of the pump barrel, starting the axial flow pump or submersible pump, and pumping out excess sludge. The invention avoids the defect that the traditional secondary sedimentation tank mud discharge and venting well cannot be completely emptied, establishes a relatively good operation, operation and maintenanceworking environment, simultaneously saves the occupied space of the traditional valve well, reduces the excavation depth of foundation pit in the construction process, reduces the construction difficulty and risk, and shortens the construction period.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a sludge discharge system for a secondary sedimentation tank and an operating method thereof. Background technique [0002] The secondary settling tank is an important part of the activated sludge water treatment system. It is an important unit to realize the separation of mud and water, clarify the mixed liquor, concentrate the sludge and provide activated sludge for the biological tank. The quality of its working effect directly affects the effluent quality of the subsequent treatment units of the sewage plant and the overall process, and also affects the sludge concentration, sludge sedimentation ratio and dissolved oxygen in the biological pool. [0003] During the production and operation of the sewage plant, the secondary sedimentation tank needs to be drained, emptied, and overhauled regularly or when the equipment fails suddenly. Normally, the vent shaft of the ...

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Problems solved by technology

[0008] 1. The secondary settling tank cannot be completely emptied, and other pumps need to be used to empty the secondary settling tank, which increases energy consumption and is not conducive to the operation, operation and maintenance of the sewage plant;

[0009] 2. The mud discharge well consists of three parts, which covers a large area, and requires a large amount of construction excavation and concrete;

[0010] 3. The depth of the sludge return well is large, and deep foundation pits need to be excavated during the construction process, which increases the construction period and construction difficulty;

[0011] 4. The distance between the drainage pipe mouth of the emptying well and the bottom of the well is relatively large, and the remaining sludge cannot be completely discharged

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