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Method for deep denitrification and dephosphorization of sewage

A technology for deep denitrification and sewage, applied in chemical instruments and methods, biological water/sewage treatment, oxidized water/sewage treatment, etc. , The effect of reducing COD content

Inactive Publication Date: 2019-02-01
SHENZHEN MUNICIPAL DESIGN & RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the country's environmental protection requirements become more and more stringent, in order to eliminate black and odorous water bodies and control water eutrophication, the discharge standards of nitrogen and phosphorus in effluent water will be increased day by day, but the existing deep nitrogen and phosphorus removal technologies cannot meet the discharge standards requirements

Method used

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  • Method for deep denitrification and dephosphorization of sewage

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The sewage is taken from the sewage treatment pilot base of Jinlian Road, Pingshan District, Shenzhen City. The sewage flows into the anaerobic tank through the water inlet. After being treated in the anaerobic tank, the effluent flows into the mud-water separation tank. After being treated in the phosphorus removal tank, it flows into the nitrification tank, after being treated in the nitrification tank, it flows into the anoxic tank, and the sludge separated from the mud-water separation tank flows into the anoxic tank. Finally, the effluent flows into the secondary settling tank, part of the sludge in the secondary settling tank flows into the anaerobic tank, and the remaining sludge is discharged from the sludge outlet, and the effluent from the secondary settling tank flows into the ozone oxidation tank. Activated carbon filter, after being treated by the biological activated carbon filter, the effluent flows into the autotrophic denitrification filter, and is disch...

Embodiment 2

[0049] The treatment method of this embodiment 2 is basically the same as that of embodiment 1, the difference is that in embodiment 2, spherical suspension filler is used as the filler of the nitrification tank, while in embodiment 1, braided fiber filler is used as the filler of the nitrification tank.

[0050] The monitoring data are as follows: the concentration of influent COD is 206-500mg / L, the concentration of influent TN is 30.0-38.0mg / L, the concentration of influent TP is 3.1-4.3mg / L, and the average concentration of effluent COD is 5.0mg / L, the average concentration of TN in the effluent is 1.5mg / L, and the average concentration of TP in the effluent is lower than 0.1mg / L, which is better than the Class IV standard for surface water.

Embodiment 3

[0052] The treatment method of this embodiment 3 is basically the same as that of embodiment 1, the difference is that the nitrification tank does not use fillers in embodiment 3, but braided fiber filler is used as the filler of the nitrification tank in embodiment 1.

[0053] The monitoring data are as follows: the concentration of influent COD is 206-500mg / L, the concentration of influent TN is 30.0-38.0mg / L, the concentration of influent TP is 3.1-4.3mg / L, and the average concentration of effluent COD is 5.6mg / L, the average concentration of TN in the effluent is 1.8mg / L, and the average concentration of TP in the effluent is lower than 0.1mg / L, which is better than the Class IV standard for surface water.

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Abstract

The invention provides a method for deep denitrification and dephosphorization of sewage. The method comprises that (1) effluent after pretreatment flows into an ozone oxidation pool, and is treated,wherein the ozone oxidation pool comprises an ozone oxidant, and difficultly-biodegraded organic matters are oxidized into easily-degraded organic matters in the ozone oxidation pool; (2) the effluentof the ozone oxidation pool flows into a biological active carbon filtering pool, wherein the biological active carbon filtering pool comprises active carbon and a biofilm attached to the surface ofthe active carbon; and (3) the effluent obtained by the treatment in the biological active carbon filtering pool flows into an autotrophic denitrification filtering pool, and the effluent obtained bythe treatment in the autotrophic denitrification filtering pool is discharged, wherein the filler in the autotrophic denitrification filtering pool contains dolomite and elemental sulfur. According tothe present invention, with the method, based on the pre-treatment, nitrogen and phosphorus in sewage can be efficiently removed, and the COD content can be reduced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for deep denitrification and dephosphorization of sewage. Background technique [0002] Due to the development of economy, the improvement of living standards, and the acceleration of urbanization, a large amount of nutrients such as N and P enter lakes, reservoirs and oceans along with rivers, causing increasingly serious water eutrophication problems. At present, there is an urgent need for economical and feasible nitrogen and phosphorus removal technologies to control the input of exogenous N and P nutrients, reduce the concentration of N and P in lakes, reservoirs and other water bodies, and control the process of water eutrophication. [0003] At present, sewage treatment plants are being upgraded gradually across the country, and the secondary effluent needs to be treated with deep nitrogen and phosphorus removal before it can be discharged. At present, s...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/78C02F3/00C02F3/28C02F9/00C02F2003/003
Inventor 张健君杨淑芳李继陈立春吴春雷林玉鹏张卿吕英俊闫智涛
Owner SHENZHEN MUNICIPAL DESIGN & RES INST
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