A method for controlling the process of nitrification reaction in sewage biochemical treatment process

A technology of biochemical treatment and nitrification reaction, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. long and other issues

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned methods are all controlled by external conditions. On the one hand, the sludge acclimation time is relatively long during the system start-up process. On the other hand, whether the online instrument can be accurately controlled after long-term operation will directly affect the denitrification effect.
CN201110353738.2 discloses a method for controlling the process of nitrification reaction in the biochemical treatment process of sewage, which is achieved by adding microbial agents that use nitrite for denitrification and denitrification to the biochemical treatment process of sewage. Although this invention can stabilize Control the process of short-term denitrification, but the preparation process of the bacterial agent is complicated and the dosage is large

Method used

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  • A method for controlling the process of nitrification reaction in sewage biochemical treatment process

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Experimental program
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Effect test

Embodiment 1

[0021] Example 1 Control of SBR denitrification system in a sewage treatment plant

[0022] A sewage treatment plant mainly produces ammonia-containing wastewater produced in the process of nitrogen fertilizer production, and adopts SBR process for treatment. The average influent ammonia nitrogen concentration is 475mg / L, and the COD concentration is 1100mg / L. After conventional treatment, the average removal rate of ammonia nitrogen is about 80%, and the nitrification rate is only 20%. Every time the water is changed, the concentration of the accelerator in the treatment system is 30mg / L, and the nitrous bacteria growth accelerator I is added. The operating conditions are temperature 29°C, pH 7.8-8.2, dissolved oxygen 0.5-2.0mg / L After 5 days of operation, the nitrification rate increased to 80%, and the removal rate of ammonia nitrogen reached more than 85%, realizing stable short-range nitrification and denitrification.

Embodiment 2

[0023] Example 2 Control of A / O denitrification process in a sewage treatment plant

[0024] The ammonia nitrogen removal rate of the A / O denitrification system of a sewage treatment plant was over 80% and the total nitrogen removal rate was less than 60% during long-term operation. A large amount of unreacted nitrate nitrogen was detected in the system. According to the accelerator concentration in the treatment system is 25mg / L, add nitrous bacteria growth accelerator II, the operating conditions are temperature 30°C, pH 8.0-8.8, dissolved oxygen 0.1-1.5mg / L, and the removal rate of total nitrogen after stabilization It is always above 85%, and the nitrification rate can reach more than 80%, indicating that the total nitrogen removal rate is significantly improved after adding the accelerator, and the nitrification reaction process is stably controlled in the nitrous acid stage.

Embodiment 3

[0025]Embodiment 3 A certain sewage treatment plant adopts the control of BAF technological process

[0026] A sewage treatment plant adopts the BAF process in the process of advanced sewage treatment. The average concentration of ammonia nitrogen in the influent is 75mg / L, and the concentration of COD is 150mg / L. After treatment, the average removal rate of ammonia nitrogen is about 80%. According to the concentration of accelerator in the treatment system is 10mg / L, nitrous bacteria growth accelerator III is added. The operating conditions are temperature 25°C, pH 7.5-8.0, dissolved oxygen 1.0- 2.0mg / L, after a period of operation, the nitrosation rate increases to 90%, and the removal rate of ammonia nitrogen reaches more than 90%.

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Abstract

The invention relates to a method for controlling a nitrification reaction progress in a sewage biochemical treatment process. Ammonia-containing sewage is subjected to nitrogen removal treatment by adopting a biochemical method; a nitrite bacteria growth promoter is added in the aerobic nitrification process after biochemical treatment; the growth promoter comprises metal salt, polyamine, organic acid hydroxylamine and Na2SO3, wherein the metal salt is 40-100 parts by weight; the polyamine is 5-30 parts by weight; the organic acid hydroxylamine is 0.05-1.5 part by weight; the Na2SO3 is 10-40 parts by weight; the metal salt comprises calcium salt, copper salt, magnesium salt and / or ferrous salt. The method provided by the invention has the benefit that as a specific composition and ratio of nitrite bacteria growth promoter is added in the wastewater aerobic nitrification process, so that the nitrification reaction progress can be stably controlled, and the nitrogen removal by shortcut nitrification and denitrification is really realized.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a method for effectively controlling the process of nitrification reaction in the biochemical treatment process of ammonia-containing sewage. Background technique [0002] Short-range nitrification-denitrification, also known as nitrite-type biological denitrification technology, is to control the nitrification process at the nitrite stage and terminate it, followed by nitrite denitrification and denitrification. Compared with traditional biological denitrification technology, short-range nitrification- Denitrification biological denitrification technology can shorten the hydraulic retention time, save 25% energy consumption and 40% carbon source, and can reduce the amount of residual sludge treatment. As a new type of biological denitrification technology, it has become one of the research hotspots in the field of sewage treatment. [0003] At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/30
CPCY02W10/10
Inventor 高会杰孙丹凤郭志华赵胜楠
Owner CHINA PETROLEUM & CHEM CORP
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