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A kind of treatment method of wastewater containing unsymmetrical dimethyl hydrazine

A technology containing unsymmetrical dimethylhydrazine and unsymmetrical dimethylhydrazine, which is applied in water/sewage treatment, natural water body treatment, neutralized water/sewage treatment, etc., can solve the problem of unsymmetrical dimethylhydrazine sewage, which constitutes a secondary pollution source , slow reaction speed and other problems, to achieve the effect of low operating cost, reduced concentration of residual ions, and reduced usage

Inactive Publication Date: 2016-04-06
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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  • A kind of treatment method of wastewater containing unsymmetrical dimethyl hydrazine
  • A kind of treatment method of wastewater containing unsymmetrical dimethyl hydrazine

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Get 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 with a flow rate of 30L / h to feed air, after 8 hours of reaction, the color of the waste liquid is bright yellow, stop the aeration, filter, adjust the pH value of the obtained filtrate to about 7, add NaClO containing 5% available chlorine under stirring at 25°C 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] Get 100mL of unsymmetrical dimethylhydrazine wastewater solution containing mass concentration 10%, 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, feed air at a flow rate of 40L / h. After 5 hours of reaction, the waste liquid turns bright yellow. Stop aeration, filter, and adjust the pH value of the obtained filtrate to about 7. 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 method for treating wastewater containing unsymmetrical dimethylhydrazine, which comprises the following steps: (1) adding hydrogen peroxide and a solid catalyst to the wastewater containing unsymmetrical dimethylhydrazine, and then passing air or oxygen for reaction and solid-liquid separation; (2) Adjust the pH of the wastewater to 5-9, then add chlorine-containing oxidants to the wastewater, and react for 5-30 minutes; wherein, the molar ratio of hydrogen peroxide to unsymmetrical dimethylhydrazine is (0.2-11):1, and the The molar ratio of chlorine-containing oxidant to unsymmetrical dimethylhydrazine is (11-0.2):1. Compared with the simple chlorine-containing oxidant oxidation method or the hydrogen peroxide oxidation method, the method of the invention has better treatment effect, complete treatment, shorter time, greatly reduced consumption of chlorine-containing oxidant, and reduces secondary pollution of water bodies.

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 Patents(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