Printing and dyeing wastewater denitrifying technology

Abstract

The invention relates to a printing and dyeing wastewater denitrifying technology, and belongs to the technical field of biological treatment to water, wastewater or sewage. In the printing and dyeingwastewater denitrifying technology, a treatment tank and a sedimentation tank are used, wherein the sedimentation tank is positioned at the tail end of the treatment tank; two anaerobic zones and four aeration zones are sequentially arranged inside the treatment tank; a water inlet of the treatment tank is formed in the anaerobic zones; a reflowing pipe is arranged inside the sedimentation tank;the other end of the reflowing pipe is connected to a starting position of the aeration zones; the anaerobic zones have the dissolved oxygen content of 0.2 mg / L or below; the aeration zones have the dissolved oxygen content of 2.0-4.0 mg / L; water to be treated is sequentially treated by the two anaerobic zones, then enters the aeration zones together with reflowing sludge so as to complete aeration, then is sent into sedimentation tank, is sedimentated and then is discharged. After being applied to printing and dyeing wastewater treatment, the printing and dyeing wastewater denitrifying technology has the beneficial effects of low cost, high carbon source utilization rate and the like.

Description

technical field [0001] The application relates to a process for denitrification of printing and dyeing wastewater, which belongs to the technical field of biological treatment of water, wastewater or sewage. Background technique [0002] Printing and dyeing wastewater usually contains NO 3 - , NH 4 + , the existence of these ions will affect the total nitrogen content of the discharged wastewater. If the total nitrogen content is too high, it will cause eutrophication of the water body. Therefore, denitrification treatment is usually carried out during the treatment process. There are three commonly used denitrification methods: the first is the oxidation ditch structure, which divides the treatment tank into an aerated area and a non-aerated area, but because the single overflow reaction time in the non-aerated area is very short, the The nitrification reaction is sufficient but the denitrification reaction in the aeration zone is not sufficient, and the total nitrogen ...

AI Technical Summary

Problems solved by technology

There are three commonly used denitrification methods: the first is the oxidation ditch structure, which divides the treatment tank into an aerated area and a non-aerated area, but because the single overflow reaction time in the non-aerated area is very short, the The nitrification reaction is sufficient but the denitrification reaction in the aeration zone is not sufficient, and the total nitrogen removal rate is generally 40-50%; The sewage and wastewater are used as the carbon source, the flow rate is relatively large, the requirements for the inner diameter of the pipeline are relatively high, and the construction cost is high; the third is to set up a denitrification zone after the sewage and wastewater aeration treatment system, but this method requires an additional denitrification carbon source , higher processing cost

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