The method of advanced treatment of tail water of sewage treatment plant by artificial wetland

Abstract

The invention discloses a method for advanced treatment of tail water of a sewage treatment plant by using artificial wetlands, comprising: step 1, the sewage to be treated is lifted by a lifting pump room and then entered into a sedimentation tank for pretreatment, where particulate matter settles; step 2 1. The sewage enters the surface flow artificial wetland from the sedimentation tank, and the pollutants in the sewage are further degraded; step 3, the sewage enters the composite artificial wetland from the surface flow artificial wetland, and the pollutants are further degraded and denitrified to remove nitrogen; step 4, the sewage Enter the ecological swamp wetland from the compound artificial wetland to further remove pollutants in the water; step 5, the sewage passes through the ecological swamp wetland and enters the natural ecological wetland with more ecological landscape characteristics, and performs final treatment on the residual pollutants to obtain the tail water discharged up to the standard . The invention has high water quality purification efficiency, fast water passing speed, low initial construction cost and low initial construction cost.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for advanced treatment of tail water of a sewage treatment plant by using artificial wetlands. Background technique [0002] At present, the effluent of most domestic sewage treatment plants basically meets the national "Comprehensive Wastewater Discharge Standard (GB8978-1996)" Grade A (the highest standard) or Grade B standard before it can be discharged into the water body. Compared with the minimum standard of "Surface Water Environmental Quality Standard (GB 3838-2002)", the effluent of sewage treatment plant still contains a large amount of COD Cr , NH 3 -N and TP. Therefore, the tail water discharge of sewage treatment plants is still an important source of pollution for some surface water bodies with low environmental capacity. In order to effectively protect the surface water environment, it is necessary to further treat the tail water of the sewage treatment p...

AI Technical Summary

Problems solved by technology

[0003] Although the tertiary treatment of the traditional sewage treatment plant can make the COD in the tail water Cr , NH 3 -N and TP meet the relevant standards in the "Environmental Quality Standards for Surface Water (GB 3838-2002)", but it is difficult to promote them on a large scale due to their high investment and operating costs

At the same time, a large number of facts also show that relying solely on the traditional tertiary treatment method of sewage treatment plants will lead to a large amount of use of chemicals and may cause secondary pollution of chemicals. It is difficult to fundamentally solve the problem of water pollution and can only delay its development trend.

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