A short-range nitrification method for sewage treatment

A short-range nitrification and sewage technology, which is applied in chemical instruments and methods, water treatment of special compounds, aerobic process treatment, etc., can solve the problems of unfavorable project short-range nitrification stability, increase the burden of sewage treatment system, and require high operation control, etc., to achieve Save carbon source and aeration costs, maximize application value, and improve the effect of nitrite accumulation rate

Active Publication Date: 2021-07-16
SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the need for additional sludge treatment facilities in the existing short-range nitrification treatment of sewage, and the need to add a large amount of ammonium salt or hydroxylamine salt under neutral or alkaline high-temperature conditions, which will not only cause waste of energy, but also It will also increase the burden on the sewage treatment system, and its operation and control requirements are high, which is not conducive to the short-range nitrification process of the actual project to realize the defects of stability, and then provide a method for short-range nitrification treatment of sewage

Method used

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Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a method for short-range nitrification treatment of sewage, comprising the following steps:

[0039]1) In a certain sewage treatment facility, the organic pollutant COD concentration in the sewage is 400mg / L, the ammonia nitrogen concentration is 70mg / L, the sludge concentration is 4000mg / L, the pH of the sewage is 6.8, and the sewage is continuously passed into the biochemical pool In the aerobic section, the hydraulic retention time of the sewage in the aerobic section is 7 hours, and the dissolved oxygen concentration is 3 mg / L, and then the short-range nitrification accelerator is added to the sewage in the aerobic section in an intermittent manner (so The short-range nitrification accelerator is composed of 5 parts by weight of ammonium chloride and 10 parts by weight of hydroxylamine hydrochloride), and the dosing frequency is 4 times / day, and the short-range nitrification accelerator is added according to the amount of hydroxylamine concen...

Embodiment 2

[0042] This embodiment provides a method for short-range nitrification treatment of sewage, comprising the following steps:

[0043] 1) In a certain sewage treatment facility, the organic pollutant COD concentration contained in sewage is 100mg / L, the ammonia nitrogen concentration is 10mg / L, the sludge concentration is 2000mg / L, and the pH of the sewage is 6.5. The sewage is continuously passed into the biochemical pool In the aerobic section, the hydraulic retention time of the sewage in the aerobic section is 3 hours, and the dissolved oxygen concentration is 1mg / L, and then the short-range nitrification accelerator is added to the sewage in the aerobic section in an intermittent manner (so The short-range nitrification accelerator is composed of 0.1 parts by weight of ammonium sulfate and 2 parts by weight of hydroxylammonium phosphate), and the dosing frequency is 6 times / day, and the short-range nitrification accelerator is added according to the amount of hydroxylamine c...

Embodiment 3

[0046] This embodiment provides a method for short-range nitrification treatment of sewage, comprising the following steps:

[0047] 1) In a sewage treatment facility, the organic pollutant COD concentration in sewage is 300mg / L, the ammonia nitrogen concentration is 50mg / L, the sludge concentration is 6000mg / L, the pH of the sewage is 6.95, and the sewage is continuously passed into the biochemical pool In the aerobic section, the hydraulic retention time of the sewage in the aerobic section is 8 hours, and the dissolved oxygen concentration is 4mg / L, and then the short-range nitrification accelerator is added to the sewage in the aerobic section in an intermittent manner (so The short-range nitrification accelerator is composed of 20 parts by weight of ammonium bicarbonate and 30 parts by weight of hydroxylammonium sulfate), and the dosing frequency is 4 times / day, and the short-range nitrification accelerator is added according to the amount of hydroxylamine concentration in...

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Abstract

The invention relates to the field of sewage treatment, in particular to a method for short-range nitrification treatment of sewage. The method for treating sewage with short-range nitrification provided by the invention comprises the steps of: adding a short-range nitrification accelerator to the sewage, the short-range nitrification accelerator comprising 2-30 parts by weight of inorganic hydroxylamine and 0.1-20 parts by weight of inorganic ammonium salt ; The pH of the sewage is 6.5-6.95. The method for short-range nitrification treatment of sewage provided by the invention can significantly increase the nitrite accumulation rate, control the biological nitrification reaction in the stage of nitrite accumulation, thereby benefiting the sewage denitrification process, improving the treatment effect of waste water, and having a good effect engineering application value.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for short-range nitrification treatment of sewage. Background technique [0002] The basic principle of traditional biological denitrification: under aerobic conditions, ammonia nitrogen is converted into nitrite under the action of ammonia-oxidizing bacteria (Ammonia-oxidizing Bacteria, AOB) with oxygen as the electron acceptor, while consuming alkalinity, and then, Nitrite is oxidized to nitrate under the action of Nitrite-oxidizing Bacteria NOB, and the whole process is called nitrification; denitrification refers to the denitrification bacteria (DenitrificationBacteria) , using organic matter as an electron donor, reducing nitrate nitrogen to nitrogen and generating alkalinity. The main principle of short-cut nitrification and denitrification denitrification is to use the activity difference between AOB and NOB to control the product of nitrification reaction to stay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/02C02F101/16
CPCC02F3/02C02F2305/06C02F2101/16Y02W10/10C02F3/303C02F3/006C02F3/307C02F2209/06C02F2209/08C02F2209/14C02F2209/22C02F2209/44C02F2303/06
Inventor 侯锋张婷曹效鑫庞洪涛邵彦青彭永臻
Owner SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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