Integrated efficient treatment system for district sewage

Abstract

The invention discloses an integrated efficient treatment system for district sewage. The district sewage alternately operates in an anoxic-aerobic environment to realize synchronous nitrogen and phosphorus removal; the district sewage is precipitated through a secondary sedimentation tank, and finally, the district sewage respectively enters a coagulation tank and a flocculation tank. PAC and PAMare respectively added for coagulation reaction to remove residual TP, SS and the like in the sewage, SS and colloidal substances are flocculated into relatively large particles, sludge-water separation is performed through a sedimentation tank, and finally, the up-to-standard sewage is discharged. Meanwhile, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank and the secondary sedimentation tank are positioned in a reaction container and are separated by partition plates, so that the occupied area and the engineering cost are greatly saved. Therefore, the sewage treatment occupied area is effectively saved and the engineering cost and the operation cost are reduced while the effluent is up to the standard, the treatment effect is good, the equipment operation is stable and reliable, and the operation is convenient.

Description

Technical field: [0001] The invention relates to the field of sewage treatment, in particular to an integrated high-efficiency sewage treatment system in an area. Background technique: [0002] At present, the effluent index of the sewage treatment project in the area has been raised from the original Class B standard to the Class A standard. The existing mature process flow of sewage treatment in the area is: sewage inflow→grid filtration→storage tank→biochemical reaction tank→secondary sedimentation tank→water discharge. This process can only meet the original first-level B standard effluent index, and cannot reach the current one. The first-level A standard effluent index cannot meet the effluent water quality requirements after the standard is raised. The reason is that the existing sewage treatment projects in the area mainly rely on the phosphorus-phasing bacteria in the sewage in the biochemical process section to dephosphorize the phosphorus in the sewage. It is enr...

AI Technical Summary

Problems solved by technology

The existing mature process flow of sewage treatment in the area is: sewage inflow→grid filtration→storage tank→biochemical reaction tank→secondary sedimentation tank→water discharge. This process can only meet the original first-level B standard effluent index, and cannot reach the current one. The first-level A standard effluent index cannot meet the effluent water quality requirements after the standard is raised. The reason is that the existing sewage treatment projects in the area mainly rely on the phosphorus-phasing bacteria in the sewage in the biochemical process section to dephosphorize the phosphorus in the sewage. It is enriched into the sludge, then enters the secondary settling tank for sedimentation, and is removed in the form of excess sludge

As the influent water quality fluctuates, the phosphorus removal effect is not stable and cannot meet the effluent index of 0.5mg/L; if the remaining sludge stays for a long time, the phosphorus in the sludge will be released again

[0003] In order

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