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Advanced nitrogen removal method for municipal sewage

A technology for deep denitrification and urban sewage, applied in water/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problem of low limestone dissolution rate, improve effluent water quality, and improve denitrification effect Effect

Pending Publication Date: 2021-02-09
海天水务集团股份公司
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AI Technical Summary

Problems solved by technology

However, the dissolution rate of limestone is low, and when the concentration of nitrate nitrogen in the influent is high, the dissolution rate of limestone will become a limiting factor

Method used

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Examples

Experimental program
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Embodiment 1

[0025] A method for deep denitrification of urban sewage, which will go through A 2 O The sewage treated by the biological denitrification process is subjected to a sulfur autotrophic deep denitrification process, wherein the filler used in the sulfur autotrophic deep denitrification process is a mixture of egg shells or shellfish shells and elemental sulfur, where egg shells and elemental sulfur The mass ratio of shellfish shells to elemental sulfur is 1.1:1; the mass ratio of shellfish shells to elemental sulfur is 1.05:1.

[0026] The above technical scheme uses egg shells or shellfish shells instead of commonly used limestone as alkaline substances for dissolving carbonate, neutralizes the hydrogen ions generated after denitrification reaction of elemental sulfur as electron acceptors, and makes sulfur autotrophic deep denitrification process The pH value of the medium environment was always maintained within the suitable pH range for the growth of Thiobacillus denitrifica...

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PUM

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Abstract

The invention discloses an advanced nitrogen removal method for municipal sewage. The method performs a sulfur autotrophic denitrification nitrogen removal process on sewage treated by an A2O biological denitrification process, the filler adopted in the sulfur autotrophic denitrification nitrogen removal process is egg shells or a mixture of shellfish shells and elemental sulfur, and the mass ratio of the egg shells to the elemental sulfur is 1.1:1; and the mass ratio of the shellfish shells to the elemental sulfur is 1.05:1. According to the advanced nitrogen removal method for municipal sewage disclosed by the invention, the sulfur autotrophic denitrification nitrogen removal process is added after the A2O biological denitrification process, and sewage advanced nitrogen removal is realized through the sulfur autotrophic denitrification nitrogen removal process, so that the outlet water quality reaches the surface water IV-class water standard.

Description

technical field [0001] The invention relates to the technical field of domestic sewage treatment, in particular to a method for deep denitrification of urban sewage. Background technique [0002] Biological treatment technology is one of the most widely used methods in modern sewage treatment. Nitrogen pollution is an important cause of water pollution. Domestic sewage contains a certain amount of nitrogen. Therefore, in the process of sewage treatment, denitrification treatment is almost a necessary treatment step. [0003] The commonly used biological denitrification process consists of nitrification and denitrification reactions. In the nitrification reaction, the biological nitrogen in the sewage is converted into ammonia nitrogen through ammonification reaction, and then converted into nitrate nitrogen through nitrite nitrogen under the action of chemoautotrophic bacteria; in the denitrification reaction, under anaerobic conditions, Nitrate nitrogen is used as an elec...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/30C02F9/14C02F101/10C02F101/16
CPCC02F3/2806C02F3/305C02F1/281C02F2101/101C02F2101/16Y02W10/10
Inventor 钟亚萍蒋沛廷高亚琳费功全汪锐沈丹杰彭玉梅陈婷婷
Owner 海天水务集团股份公司
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