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A kind of treatment method of unsymmetrical dimethylhydrazine wastewater

A treatment method, the technology of unsymmetrical dimethylhydrazine, is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., and can solve the problem of long treatment time, poor treatment effect, resin regeneration secondary Secondary pollution and other problems, to achieve the effect of thorough treatment, improvement of adsorption capacity, and reduction of usage

Inactive Publication Date: 2017-11-10
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chemical treatment methods such as ozone oxidation, photocatalytic oxidation, chlorination, etc., these methods can theoretically decompose unsymmetrical dimethylhydrazine into harmless small molecules, but the decomposition reaction often cannot be completely carried out, and more or less produced Toxic Intermediate Decomposition Products
When the concentration of unsymmetrical dimethylhydrazine in the wastewater is higher, the treatment effect is worse and the treatment time is longer
Biological treatment methods such as aquatic plant degradation method, bacterial degradation method, etc., but because the biological treatment environment is difficult to control, the use has great limitations
Physical treatment mainly includes activated carbon adsorption method and ion exchange method, but the activated carbon adsorption method has the problem of incomplete treatment, while the ion exchange method has the problems of resin regeneration and secondary pollution of regenerated organisms

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 50 mL of unsymmetrical dimethylhydrazine aqueous solution (mass concentration is 0.6%), add 1 mL of formaldehyde with a mass concentration of 40%, and react at 35°C for 1 hour, then add 10 g of coal-based conventional powdered activated carbon (commercially available) to the solution to absorb After 1h, filter, and the content of unsymmetrical dimethylhydrazine in the filtrate is 19 mg / L.

[0025] Control experiment: take 50mL of unsymmetrical dimethylhydrazine aqueous solution (mass concentration 0.6%), absorb with 10g of coal-based conventional powdered activated carbon for 2h, filter, and the mass concentration of unsymmetrical dimethylhydrazine in the filtrate is 0.1%. It can be seen from the comparison experiment that the effect of simply adsorbing by activated carbon is obviously poor.

Embodiment 2

[0027] Take 50mL of unsymmetrical dimethylhydrazine aqueous solution (mass concentration is 0.1%), add 1mL of furfural, react at 20°C for 1h, a brownish-yellow solid is precipitated in the solution, centrifuge, then add 2g of coal-based conventional powdered activated carbon to the solution for adsorption for 0.5h, After filtration, a colorless and clear filtrate was obtained. The content of unsymmetrical dimethylhydrazine in the filtrate was detected to be 7.5 mg / L.

[0028] Control experiment: take 50mL of unsymmetrical dimethylhydrazine aqueous solution (mass concentration 0.1%), absorb with 2g of coal-based conventional powdered activated carbon for 0.5h, filter, and the mass concentration of unsymmetrical dimethylhydrazine in the filtrate is 0.03%.

Embodiment 3

[0030] Be that the acetaldehyde aqueous solution of 40% replaces the furfural in embodiment 2 with 0.2mL mass concentration, other is with embodiment 2, and the unsymmetrical dimethylhydrazine content is 20mg / L in the final filtrate.

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Abstract

The invention discloses a treatment method of unsymmetrical dimethylhydrazine wastewater, which comprises the following steps: (1) adding a condensing agent to the unsymmetrical dimethylhydrazine wastewater, and mixing and reacting, the condensing agent is aldehyde, ketone and / or sugar; (2) ) After the mixed reaction in step (1), add adsorbent to the wastewater for adsorption treatment. Compared with the existing active carbon adsorption method of unsymmetrical dimethylhydrazine, after the method of the present invention adds ketone, aldehyde and sugar in the unsymmetrical dimethylhydrazine wastewater, it can not only significantly improve the ability of the unsymmetrical dimethylhydrazine to be adsorbed by the adsorbent, but also make the unsymmetrical dimethylhydrazine in the wastewater The treatment of dimethylhydrazine is more thorough, and the method of extraction and filtration can be properly used to reduce the amount of adsorbent used.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a treatment method for unsymmetrical dimethylhydrazine wastewater. Background technique [0002] Unsymmetrical dimethylhydrazine (1,1-dimethylhydrazine, UDMH) is a liquid rocket fuel with good performance, which is widely used in the fields of national defense and aerospace science and technology, but it is volatile and toxic. [0003] After unsymmetrical dimethylhydrazine sewage is discharged into the environment, the wastewater not only contains unsymmetrical dimethylhydrazine, but also oxidatively decomposes to produce components such as nitrosodimethylamine, partial hydrazone, dimethylamine, hydrocyanic acid, and formaldehyde. The toxicity of the components exceeds that of unsymmetrical dimethylhydrazine, so it is of great significance to the treatment of unsymmetrical dimethylhydrazine wastewater. [0004] At present, the treatment methods of unsymmetrical di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/38
Inventor 裴奔张海军常彦龙郭跃萍田靖覃文武
Owner LANZHOU UNIVERSITY
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