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Treatment method for unsymmetrical dimethylhydrazine-containing wastewater

A technology containing unsymmetrical dimethyl hydrazine and a treatment method, which is applied in the field of wastewater treatment, can solve the problems of poor unsymmetrical dimethyl hydrazine sewage effect, constitutes a secondary pollution source, slow reaction speed and the like, and achieves low operating cost and residual ion content. The effect of reducing the concentration and reducing the amount of use

Inactive Publication Date: 2015-02-18
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chemical oxidation methods mainly include fenten reagent oxidation method and chlorination method. However, fenten reagent oxidation method has problems such as incomplete oxidation, loss of metal ions, and secondary pollution sources. The effect of dimethylhydrazine sewage is not good, the reaction speed is slow, and it is easy to produce nitroso compounds, formaldehyde and FDMH (CH 2 =NN(CH 3 ) 2 ) and other secondary pollutants, need to be discharged after appropriate treatment

Method used

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  • Treatment method for unsymmetrical dimethylhydrazine-containing wastewater
  • Treatment method for unsymmetrical dimethylhydrazine-containing wastewater

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Effect test

Embodiment 1

[0027] Take 20mL of unsymmetrical dimethylhydrazine wastewater solution containing 50% mass concentration, add 30wt% H in four times 2 o 2 A total of 113mL, 1g activated carbon supported solid catalyst Fe 2 o 3 , At 20°C, air was introduced at a flow rate of 30L / h. After 8 hours of reaction, the color of the waste liquid was bright yellow. Stop aeration and filter. The solution was 236mL, and the pH value of the solution was always maintained at 7.0-7.5 during the addition process, and the stirring was continued for 30 minutes after the addition was completed. The test results of the water body after the above treatment are listed in Table 1. The gas generated during the reaction process is heated in a 700°C tube furnace, then passed into water for absorption, and then discharged into the atmosphere.

Embodiment 2

[0029] Take 100mL of unsymmetrical dimethylhydrazine wastewater solution containing 10% mass concentration, and add 30wt% H in three times. 2 o 2 A total of 113mL, 0.5g solid catalyst MnO 2 , at 15°C, air was introduced at a flow rate of 40L / h. After 8 hours of reaction, the waste liquid turned bright yellow. Stop aeration and filter. 236mL, keep the pH value of the solution at 7.0-7.5 during the addition process, and continue to stir for 30 minutes after the addition is complete. The water body test results after the above treatment are listed in Table 1. The gas generated during the reaction process is heated in a 700°C tube furnace, then passed into water for absorption, and then discharged into the atmosphere.

Embodiment 3

[0031] Get 100mL of unsymmetrical dimethylhydrazine wastewater solution containing 3% mass concentration, and add 23mL of 30wt% H at one time. 2 o 2 , 0.5g solid catalyst Fe 2 o 3 At 20°C, air was introduced at a flow rate of 40 L / h. After 5 hours of reaction, the waste liquid turned bright yellow. Stop aeration and filter. Chlorine gas was added for 2 minutes, and the pH value of the solution was maintained at 7.0 to 7.5 during the feeding process. After the addition, the stirring was continued for 30 minutes to obtain a clear and transparent solution. The water body test results after the above treatment are listed in Table 1. The gas generated during the reaction is heated in a tube furnace at 500°C, then passed into water for absorption, and then discharged into the atmosphere.

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Abstract

The invention discloses a treatment method for unsymmetrical dimethylhydrazine-containing wastewater. The treatment method comprises the following steps: (1) adding hydrogen peroxide and a solid catalyst into the unsymmetrical dimethylhydrazine-containing wastewater, feeding air or oxygen, reacting, and performing solid-liquid separation; (2) adjusting the pH of the wastewater to be 5 to 9, and adding chlorine-containing oxidant into the wastewater for reacting for 5 to 30 minutes, wherein the hydrogen peroxide and the unsymmetrical dimethylhydrazine are in the molar ratio of (0.2-11):1, and the chlorine-containing oxidant and the unsymmetrical dimethylhydrazine are in the molar ratio of (11-0.2):1. Compared with a pure chlorine-containing oxidant oxidation method or a pure hydrogen peroxide oxidation method, the method disclosed by the invention has a good treatment effect, the treatment is thorough, the time is short, the using amount of the chorine-containing oxidant is greatly reduced, and the secondary pollution of a water body is reduced.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, in particular to a method for treating wastewater containing unsymmetrical dimethylhydrazine. Background technique [0002] Unsymmetrical dimethylhydrazine (UDMH) is widely used in the fields of biology, chemistry, military and aerospace. Due to its potential carcinogenicity and possible mutagenicity, its environmental problems have attracted great attention. At present, many scholars and research institutions at home and abroad have done detailed research on the treatment of unsymmetrical dimethylhydrazine, and proposed many methods. The treatment methods for unsymmetrical dimethylhydrazine waste gas mainly include water absorption method, high-altitude emission method, combustion method, and activated carbon adsorption method. Among them, the absorption liquid produced by the water absorption method needs further treatment. However, unsymmetrical dimethylhydrazine wastewater is still a di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/74C02F103/36
CPCC02F1/66C02F1/722C02F1/725C02F1/727C02F1/74C02F1/76C02F9/00C02F2103/38
Inventor 张海军常彦龙裴奔郭跃萍田靖
Owner LANZHOU UNIVERSITY
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