Activated sludge wastewater treatment device and wastewater treatment technology

Abstract

The invention discloses an activated sludge wastewater treatment device and a wastewater treatment technology. The activated sludge wastewater treatment device comprises a biochemical pool and a secondary sedimentation tank, wherein the outlet of the biochemical pool is communicated with the inlet of the secondary sedimentation tank, the activated sludge outlet of the secondary sedimentation tank is communicated with the inlet of the biochemical pool, the interior of the biochemical pool is sequentially provided with an anaerobic zone, an anoxic zone, an aerobic zone, an internal settling zone and a post-aerobic zone along a wastewater flow direction, the anaerobic zone is communicated with the inlet of the biochemical pool, and the post-aerobic zone is communicated with the outlet of the biochemical pool; the internal settling zone comprises a settling zone and an activated sludge collecting zone, and an activated sludge collecting pipe is arranged in the settling zone; a plurality of collecting holes are formed in the activated sludge collecting pipe. The activated sludge wastewater treatment device has the advantages that the concentration of sludge in the biochemical pool is greatly improved on the premise that the volume of a conventional biochemical pool is maintained, the concentration of activated sludge entering the secondary sedimentation tank is also reduced, and the effluent quality of the secondary sedimentation tank is improved; the quantity of reflux of the secondary sedimentation tank is relatively small, and the phosphorus release capacity of the biochemical pool is improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an activated sludge sewage treatment device and a sewage treatment process. Background technique [0002] Activated sludge process is the main process of sewage treatment, and it has been widely used in the treatment of municipal sewage and various industrial wastewater. The main principle of this process is that the microorganisms cultivated in the biochemical tank capture the pollutants in the sewage, and then settle down in the secondary sedimentation tank. Under the action of aeration, microorganisms can greatly degrade the pollutants in the water; at the same time, under the action of microbial flocculation and sedimentation, most of the undegraded pollutants can be precipitated in the secondary sedimentation tank along with the activated sludge, so that The effluent from the secondary settling tank is clarified. In conventional municipal sewage treatment, the eff...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in the conventional activated sludge process, if the concentration of activated sludge in the biochemical tank is increased, the amount of activated sludge entering the secondary settling tank will inevitably be too large, resulting in a decline in the quality of the effluent of the secondary settling tank; If the concentration of activated sludge entering the secondary sedimentation tank is reduced to ensure the quality of the effluent, it must be achieved by reducing the concentration of activated sludge in the biochemical tank, which in turn will lead to a high load of activated sludge in the biochemical tank and a decrease in the effect of sewage treatment

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