Method for promoting two-stage precipitation of continuous flow aerobic granular sludge

Abstract

The invention provides a method for promoting two-stage sedimentation of continuous flow aerobic granular sludge, the method comprises the following steps: arranging a biochemical reaction tank, a granular sludge sedimentation tank and an inclined plate sedimentation tank which are connected in sequence, and arranging an inclined plate device in the inclined plate sedimentation tank; sewage continuously flows into the biochemical reaction tank, a sludge-water mixed solution subjected to biochemical reaction enters the granular sludge sedimentation tank, heavier sludge in the sludge-water mixed solution is quickly settled into heavy sludge in the granular sludge sedimentation tank, and the heavy sludge flows back to the biochemical reaction tank; light flocculent sludge in the sludge-water mixed liquid flows into the inclined plate sedimentation tank, and the sludge subjected to accelerated separation by the inclined plate device is collected at the lower part of the inclined plate sedimentation tank to be discharged. According to the invention, particle accumulation of aerobic sludge is carried out in a continuous flow mode, through the arrangement of the particle sludge sedimentation tank and the inclined plate sedimentation tank, heavier sludge is separated, light sludge flocs are discharged, the formation of aerobic particle sludge is promoted, and the separation time of the light sludge is greatly shortened by utilizing the inclined plate device.

Description

technical field [0001] The invention relates to a method for promoting the precipitation of aerobic granular sludge, in particular to a method for promoting the two-stage precipitation of continuous flow aerobic granular sludge, which belongs to the field of sewage treatment. Background technique [0002] Aerobic granular sludge technology is a new type of wastewater treatment technology, which has good settling performance, high sludge concentration, and can better withstand high organic loads, toxic and harmful substances, impact loads, etc., and is receiving more and more attention in the field of sewage and wastewater treatment. s concern. The formation mechanism of aerobic granular sludge is complex, including physical, chemical and biological interactions. The general formation process can be regarded as the biological aggregation phenomenon formed by microbial self-fixation under certain fluid dynamics and selective pressure conditions. . [0003] Current research h...

AI Technical Summary

Problems solved by technology

[0004] The current research shows that the aerobic granular sludge method, as an extension and improvement process of the widely used activated sludge process, has a good and stable total nitrogen removal effect and can significantly reduce the amount of excess sludge, but except The phosphorus mechanism is relatively complex, and there is a certain contradiction between the optimized conditions for particle growth and the growth environment requirements of typical phosphorus-accumulating microorganisms, which cannot meet the effluent requirements that have been greatly increased, especially for total phosphorus content. The way of adding chemical coagulant will affect the formation conditions of granular sludge and the treatment effect of total nitrogen

Subsequent treatment measures with the help of chemical coagulant process, such as high-efficiency sedimentation, coagulation filtration, etc., will significantly increase the project investment cost, and cause new sludge types and sludge generation points, increasing the difficulty of the next sludge treatment process section and fees

Images