High organic nitrogen concentration wastewater treatment

A treatment method and high organic technology, applied in the field of high organic nitrogen wastewater treatment, can solve the problems of inability to meet the nitrogen discharge requirements and convert it into nitrogen, and achieve the effect of stable and standard discharge and simple process

Inactive Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, some studies have tried to use algae and plant methods to remove organic nitrogen in water, but this method is limited to low-concentration organic nitrogen wastewater
There are also studies using chemical oxidation to remove organic nitrogen in water, and the removal rate of chemical oxidation can only reach about 50%; there are also studies using physical adsorption and physical sedimentation to remove organic nitrogen in water, but physical methods have not finally eliminated Nitrogen is converted to nitrogen gas, but still exists in the waste liquid or slag in the form of organic nitrogen or inorganic nitrogen
Each method has its one-sidedness, and it cannot treat organic nitrogen wastewater with a high concentration to meet the current discharge requirements for nitrogen.

Method used

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  • High organic nitrogen concentration wastewater treatment

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Effect test

Embodiment 1

[0050] A gas field amine solution purifies wastewater, the water quality is: pH 8.9, COD 12000mg / L, total nitrogen 600mg / L, organic nitrogen 560mg / L. The wastewater first enters the catalytic ozonation unit for pretreatment. The dosage of ozone is 40mg / L, and the reaction time is 40min. 280mg / L, of which organic nitrogen is 100mg / L. The effluent enters the ozone destruction pool, and then enters the anoxic pool. The anoxic residence time is 12 hours, and the dissolved oxygen is controlled at 0.1mg / L. Anoxic effluent enters the packed MBR with a residence time of 36 hours and a reflux ratio of 300%. The COD of the effluent is 59mg / L, the total nitrogen of the effluent is 25mg / L, and the ammonia nitrogen is 0.8mg / L, meeting the requirements of the local sewage discharge standards.

Embodiment 2

[0052] A petrochemical organic nitrogen wastewater, water quality: pH 6.3, COD 6000mg / L, total nitrogen 300mg / L, organic nitrogen 260mg / L. The wastewater first enters the catalytic ozonation unit for pretreatment. The dosage of ozone is 20mg / L, and the reaction time is 20min. 160mg / L, of which organic nitrogen is 60mg / L. The effluent enters the ozone destruction pool, and then enters the anoxic pool. The anoxic residence time is 6 hours, and the dissolved oxygen is controlled at 0.2mg / L. Anoxic effluent enters the packed MBR with a residence time of 24 hours and a reflux ratio of 200%. The COD of the effluent is 50mg / L, the total nitrogen of the effluent is 20mg / L, and the ammonia nitrogen is 0.5mg / L, meeting the requirements of the local sewage discharge standards.

Embodiment 3

[0054] A petrochemical organic nitrogen wastewater, water quality: pH 7.5, COD 9000mg / L, total nitrogen 450mg / L, organic nitrogen 460mg / L. The wastewater first enters the ozone oxidation unit for pretreatment, the dosage of ozone is 30mg / L, and the reaction time is 30min. After the treatment, the COD content in the wastewater is reduced from 9000mg / L to 3500mg / L, and the total nitrogen is reduced from 450mg / L to 100mg / L, of which organic nitrogen is 50mg / L. The effluent enters the ozone destruction pool, and then enters the anoxic pool. The anoxic residence time is 10h, and the dissolved oxygen is controlled at 0.1mg / L. Anoxic effluent enters the packed MBR with a residence time of 30 hours and a reflux ratio of 250%. The COD of the effluent is 55mg / L, the total nitrogen of the effluent is 25mg / L, and the ammonia nitrogen is 0.3mg / L, meeting the requirements of the local sewage discharge standards.

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Abstract

The invention relates to a high organic nitrogen concentration wastewater treatment. The high organic nitrogen concentration wastewater treatment comprises performing ozonation to remove and convert apart of organic nitrogen and organic matters, and through an ozone destruction tank, removing ozone residue in water to reduce damage of ozone to microorganisms; through anaerobic treatment, removingorganic nitrogen and organic matters in converted water and meanwhile performing denitrification reaction on nitrate nitrogen brought back by reflux to thoroughly eliminate nitrogen in the water; through a packing type MBR (membrane bioreactor) unit, thoroughly decomposing the organic matters, converting a major part of ammonia nitrogen through nitrification into nitrate nitrogen and nitrite nitrogen, performing ammonization reaction on a small part of the organic nitrogen, and meanwhile, forming an anaerobic environment inside packing biomembranes for denitrification reaction to further reduce ammonia in discharged water. The high organic nitrogen concentration wastewater treatment is practical and effective, can effectively remove nitrogen, COD (chemical oxygen demand) and the like in high organic nitrogen concentration wastewater and achieves up-to-standard discharge of the wastewater, thereby achieving high environmental benefits and a broad application prospect.

Description

technical field [0001] The invention relates to a treatment method for high organic nitrogen wastewater, more specifically a treatment process including three-step treatment units of ozone oxidation, anoxic and packed MBR, and provides a reliable method for the discharge of nitrogen in high organic nitrogen wastewater up to the standard Approach. Background technique [0002] At present, the artificially damaged nitrogen cycle has had a serious impact on human life. People have more and more stringent requirements on the control of nitrogen content in sewage. Nitrogen exists in many forms in water. According to the compound form, it can be divided into organic nitrogen, ammonia nitrogen and nitrate nitrogen. Among them, organic nitrogen is a main form of nitrogen in production and life, and it is difficult to remove it efficiently. [0003] The commonly used organic nitrogen removal methods are: biological treatment, chemical method and physical method. The ammonificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/38
Inventor 赵辉龚小芝邱小云常田
Owner CHINA PETROLEUM & CHEM CORP
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