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Method for removing dimethylamine in unsymmetrical dimethylhydrazine wastewater treatment process

A technology for unsymmetrical dimethylhydrazine and wastewater treatment, which is applied in multi-stage water treatment, water/sewage treatment, special compound water treatment, etc.

Active Publication Date: 2020-09-01
中国人民解放军火箭军工程大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] When the Fenton method is used to treat unsymmetrical dimethylhydrazine, while eliminating nitrosodimethylamine, the produced partial hydrazone, tetramethyltetrazene, etc. can also be eliminated together. The content of methylamine is still high, and there is a hidden danger that the treated wastewater will be discharged into the environment and converted into nitrosodimethylamine
At present, the research on dimethylamine mainly focuses on the conversion rate of dimethylamine to nitrosodimethylamine under reaction conditions, but the removal of dimethylamine produced during the treatment of high-concentration unsymmetrical dimethylhydrazine wastewater has not been reported in the literature.

Method used

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  • Method for removing dimethylamine in unsymmetrical dimethylhydrazine wastewater treatment process
  • Method for removing dimethylamine in unsymmetrical dimethylhydrazine wastewater treatment process
  • Method for removing dimethylamine in unsymmetrical dimethylhydrazine wastewater treatment process

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Embodiment 1

[0048] This example is used to illustrate the effect of the pH value on the elimination of dimethylamine produced in the process of treating unsymmetrical dimethylhydrazine wastewater under sunlight irradiation in the first Fenton treatment process.

[0049] (1) Heptahydrate ferrous sulfate solution (concentration is 0.5mol / L), hydrogen peroxide (30wt%) according to Fe 2+ and H 2 o 2 Mix at a molar ratio of 1:10 to obtain Fenton's reagent.

[0050] (2) Under stirring conditions, the unsymmetrical dimethylhydrazine wastewater (unsymmetrical dimethylhydrazine concentration is 1000mg / L) and Fenton's reagent are mixed (unsymmetrical dimethylhydrazine and H 2 o 2 Molar ratio 1:12), utilize sulfuric acid solution to adjust the pH value to 3, the first Fenton treatment 7h under sunlight irradiation, obtain processing crude liquid, adopt visible spectrophotometry to measure dimethylamine ( DMA) concentration, the test results are shown in Table 1 and figure 1 shown.

Embodiment 2

[0052] Process the unsymmetrical dimethylhydrazine wastewater according to the method of Example 1, and the difference with Example 1 is that in step (2), the pH value is adjusted to 5, and the concentration of dimethylamine in the crude liquid is processed under different first Fenton treatment times The test results are shown in Table 1 and figure 1 shown.

Embodiment 3

[0061] This embodiment is used to illustrate the elimination effect of unsymmetrical dimethylhydrazine, partial hydrazone, nitrosodimethylamine and dimethylamine in the process of treating unsymmetrical dimethylhydrazine wastewater under sunlight irradiation in the first Fenton treatment process.

[0062] (1) Heptahydrate ferrous sulfate solution (concentration is 0.5mol / L), hydrogen peroxide (30wt%) according to Fe 2+ and H 2 o 2 Mix at a molar ratio of 1:10 to obtain Fenton's reagent.

[0063] (2) Under stirring conditions, the unsymmetrical dimethylhydrazine wastewater (unsymmetrical dimethylhydrazine concentration is 1000mg / L) and Fenton's reagent are mixed (unsymmetrical dimethylhydrazine and H 2 o 2 Molar ratio 1:12), utilize sulfuric acid solution to adjust the pH value to 3, the first Fenton treatment 7h under sunlight irradiation, obtain processing crude liquid, adopt visible spectrophotometry to measure dimethylamine ( DMA) and the concentration of unsymmetrical ...

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Abstract

The invention provides a method for removing dimethylamine in the unsymmetrical dimethylhydrazine wastewater treatment process, and belongs to the technical field of wastewater treatment. The method for removing dimethylamine in the unsymmetrical dimethylhydrazine wastewater treatment process comprises the following steps: mixing a Fenton reagent with unsymmetrical dimethylhydrazine wastewater, adjusting the pH value to 2.5-6, and carrying out first Fenton treatment to obtain a treated crude solution; and adjusting the pH value of the treated crude liquid to 6-8, then mixing the treated crudeliquid with a hydrogen peroxide solution, carrying out second Fenton treatment on the obtained treated crude liquid-hydrogen peroxide mixed solution, and discharging the obtained second Fenton treatment solution after the concentration of dimethylamine in the obtained second Fenton treatment solution is lower than 5.0 mg / L. According to the removal method provided by the invention, unsymmetrical dimethylhydrazine and nitrosodimethylamine and unsymmetrical hydrazone generated in the treatment process can be thoroughly removed through first Fenton treatment, the concentration of dimethylamine can be reduced to less than 5.0 mg / L through the second Fenton treatment, the risk of converting dimethylamine into a high carcinogen nitrosodimethylamine is reduced, and the process is simple.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing dimethylamine in the wastewater treatment process of unsymmetrical dimethylhydrazine. Background technique [0002] Due to the high toxicity and volatile characteristics of unsymmetrical dimethylhydrazine, a large amount of toxic waste water is produced in the process of production, transportation and use, which has a great impact on the environment and the health of the test personnel. At present, the oxidation method is a common method for treating unsymmetrical dimethylhydrazine wastewater, which includes: supercritical method, calcium hypochlorite method, ultraviolet-ozone oxidation method, Cu 2+ / H 2 o 2 method, Fenton method, ultraviolet chlorination method, supported Cu, Fe catalyst H 2 o 2 method, titanium dioxide photocatalytic method, etc. [0003] The existing oxidation treatment method has a very fast removal rate for unsymmetri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/38
CPCC02F1/722C02F1/32C02F1/30C02F2101/38C02F2305/026C02F2301/08
Inventor 刘祥萱王煊军刘博黄丹卜晓宇
Owner 中国人民解放军火箭军工程大学
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