System and method for improving biochemistry and deeply treating sewage by utilizing powdered activated carbon

Abstract

The invention discloses a system and a method for improving biochemistry and deeply treating sewage by utilizing powdered activated carbon. The system comprises pretreatment equipment, a biochemical tank, a secondary sedimentation tank, a high-density sedimentation tank and a submerged ultra-filtration membrane separation subsystem; the sewage enters the biochemical tank after being treated by the pretreatment equipment and is then conveyed into the secondary sedimentation tank for separation, and an effluent enters the high-density sedimentation tank for sedimentation; one part of the sludge in the high-density sedimentation tank flows back to the high-density sedimentation tank, and the other part is discharged into a sludge concentration tank; the effluent in the high-density sedimentation tank is inputted into the submerged ultra-filtration membrane separation subsystem and is mixed with and separated from the activated carbon in the submerged ultra-filtration membrane separation subsystem; carbon slurry in the submerged ultra-filtration membrane separation subsystem circularly flows back, one part flows back into the biochemical tank, and the other part flows back into the submerged ultra-filtration membrane separation subsystem; part of effluent in the submerged ultra-filtration membrane separation subsystem meets the standard to be discharged or recycled, and the other part is conveyed into a clean water tank for backwashing of the submerged ultra-filtration membrane separation subsystem.

Description

technical field [0001] The invention belongs to the field of sewage advanced treatment, and relates to a system and method for improving biochemical and sewage advanced treatment, in particular to a system for improving biochemical and sewage advanced treatment by combining biological activated carbon (PACT) and submerged ultrafiltration membrane separation and methods. Background technique [0002] Municipal sewage has the characteristics of high suspended solids content, high COD concentration, high ammonia nitrogen content, and high total phosphorus content. After conventional secondary biochemical treatment and chemical precipitation treatment, the effluent COD and other indicators are still difficult to meet the national surface water standard. Depth Processing technology for further processing. Advanced oxidation such as ozone oxidation has good decolorization effect, but poor COD removal effect; Fenton oxidation decolorization ability is strong, COD removal effect is...

AI Technical Summary

Problems solved by technology

[0006] Although the existing "secondary biochemical effluent + powder activated carbon + submerged ultrafiltration membrane separation" process has the above advantages, there are still many problems: the effluent of the biochemical pool is highly toxic, the content of ammonia nitrogen is high, and the ultrafiltration membrane cannot effectively remove it. For ammonia nitrogen, the dosage of powdered activated carbon is relatively large during operation. For the case where the COD concentration of incoming water is low, there is a problem that the powdered activated carbon is discharged from the membrane pool without adsorption and saturation, resulting in waste of resources.

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