A method and system for deep removal of total nitrogen in sewage

Abstract

The invention discloses a method and a system for deeply removing total nitrogen in sewage, and relates to the technical field of sewage treatment. The method comprises the following steps: adding a carbon source into sewage containing NO3 <-> and NH4 < + >, wherein the concentration ratio of COD to nitrate nitrogen in the sewage is (2.7-3.5): 1; enabling the sewage carrying the carbon source toenter a reactor with a suspended sludge layer, penetrate through the suspended sludge layer and enter an anaerobic environment containing anaerobic bacteria, wherein the concentration ratio of COD tonitrate nitrogen in the sewage is (1-1.5): 2; and finally discharging water. The method is good in deep decarburization effect, and the process for realizing deep denitrification is simple, easy to control and easy to transform. The system comprises the reactor with the suspended sludge layer and an anaerobic reaction unit, the reactor is communicated with the anaerobic reaction unit, the reactoris provided with a sewage inlet end for sewage to enter, and the anaerobic reaction unit is provided with a clear water outlet end; the system is simple in structure, easy to implement and suitable for upgrading and reconstructing an existing sewage treatment plant.

Description

Technical field [0001] The present invention relates to the field of sewage treatment, and more specifically, it relates to a method and system for depth removal of total nitrogen in sewage. Background technique [0002] In order to make the sewage reach a water quality required to discharge into a water or the water quality required to use it, it is called sewage treatment. At present, after urban sewage is treated, the water pollutant content is often difficult to meet the primary A discharge standard, especially nitrogen, phosphorus indicators, urban sewage after secondary treatment, ammonia nitrogen content is 0.5-7.5mg / L, nitrate nitrogen 1.5- 20 mg / L, jam nitrogen nitrogen 0.005-0.02 mg / L, although the contaminant content is different from the region, sewage type and treatment, it is inevitable to exceed the emission standard. If the standard sewage is discharged directly, the natural water cannot be dispelled with excess nitrogen elements, and the long-term contamina...

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Problems solved by technology

[0007] The above-mentioned prior art scheme has the following defects: in order to achieve deep denitrification in this process, firstly, the sewage needs to enter the SBR reactor for organic matter removal, and adopt an anaerobic / aerobic alternate operation process for treatment; then the SBR reactor for organic matter removal The effluent enters the short-cut nitrification / anammox granular sludge UASB reactor, and is treated by short-cut nitrification and anaerobic ammonium oxidation processes; finally, the effluent from the short-cut nitrification / anammox granular sludge UASB reactor enters short-cut denitrification / In the anaerobic ammonium oxidation UASB reactor, the process of short-range denitrification and anaerobic ammonium oxidation is used for treatment

In the existing technology, the way to achieve deep denitrification is relatively cumbersome and the process flow is relatively long, which is not easy to control, and it is not easy to modify in the limited space of the existing sewage treatment plant

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