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A kind of processing method of nitrile rubber production waste water

A technology for producing wastewater and nitrile rubber, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Affect the processing effect, etc.

Active Publication Date: 2018-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, wastewater containing a high concentration of acrylonitrile directly enters the biological treatment unit, which will affect the treatment effect and even endanger the activity of microorganisms
At present, there is no complete set of technologies that can independently treat the wastewater produced by nitrile rubber to meet the discharge standards

Method used

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  • A kind of processing method of nitrile rubber production waste water

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Embodiment approach

[0015] In the present invention, in step a, as long as the acrylonitrile in the nitrile rubber production wastewater is reduced as far as possible, there is no special requirement on the amount of borohydride, preferably, the amount of borohydride is 2-5g. According to a preferred embodiment of the present invention, the borohydride is sodium borohydride and / or potassium borohydride.

[0016] In step a, as long as the purpose of the present invention can be achieved by using aluminum chloride while using borohydride, there is no special requirement on the amount of aluminum chloride, and the consumption of aluminum chloride is preferably 20-100mg / L acrylonitrile-butadiene rubber Produce waste water. The inventors of the present invention found that the use of the above-mentioned preferred amount of aluminum chloride can more effectively remove the acrylonitrile contained in the nitrile rubber production wastewater by catalytic reduction, so that it cannot cause harm to microor...

Embodiment 1

[0028] Adjust the pH value of wastewater 1 to 10.0, add sodium borohydride and aluminum chloride to it, so that the concentrations in the wastewater are 1.84g / L and 65mg / L respectively, and the reaction time is 80min; the above-mentioned effluent enters the coagulation gas Floating unit, add polyacrylamide so that the concentration in the wastewater is 2.5mg / L, the hydraulic retention time is 30min, and the surface hydraulic load is 6m 3 / (m 2 h); the above-mentioned effluent enters the hydrolysis acidification unit, the dissolved oxygen is controlled to be 0.15mg / L, and the hydraulic retention time is 7h; the above-mentioned effluent enters the activated sludge treatment unit, the activated sludge concentration is 3000mg / L, and the dissolved oxygen is 2mg / L, The hydraulic retention time is 14h; the above-mentioned effluent enters the biological aerated filter, the dissolved oxygen is 3mg / L, and the volume load is 0.35kg COD / m 3 d. See Table 2 for the processing results.

Embodiment 2

[0036] Adjust the pH value of wastewater 2 to 10.5, add potassium borohydride and aluminum chloride to it, so that the concentrations in the wastewater are 1.91g / L and 80mg / L respectively, and the reaction time is 70min; the above-mentioned effluent enters the coagulation gas Floating unit, add cationic polyacrylamide so that the concentration in the wastewater is 3.0mg / L, the hydraulic retention time is 25min, and the surface hydraulic load is 7m 3 / (m 2 h); the above-mentioned effluent enters the hydrolysis acidification unit, the dissolved oxygen is controlled to be 0.1mg / L, and the hydraulic retention time is 5h; the above-mentioned effluent enters the activated sludge treatment unit, the concentration of activated sludge is 3500mg / L, and the dissolved oxygen is 4mg / L. The hydraulic retention time is 16h; the above effluent enters the biological aerated filter, the dissolved oxygen is 4mg / L, and the volume load is 0.25kg COD / m 3 d. See Table 2 for the processing results....

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Abstract

The invention discloses a treatment method for nitrile rubber production wastewater. The method comprises the following steps of: a, adjusting the pH value of nitrile rubber production wastewater to be greater than 7, and mixing the wastewater, the pH value of which is adjusted, with borohydride and aluminum chloride to reduce acrylonitrile in the wastewater; and b, performing coagulation and air-flotation treatment, hydrolytic acidification treatment, activated sludge treatment and purification treatment in a biological aerated filter sequentially on the wastewater reduced by acrylonitrile. The wastewater treated by the method disclosed by the invention is basically free of acrylonitrile residues, and the COD value is less than 50 mg / L and the ammonia nitrogen content is less than 5 mg / L. The wastewater is colorless and transparent in appearance and the effluent water quality is relatively high.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a treatment method for nitrile rubber production wastewater. Background technique [0002] Due to its excellent performance and wide range of applications, the demand and production of nitrile rubber have been increasing in recent years, followed by the treatment of a large number of production wastewater. Acrylonitrile (AN) is an important monomer in the production of nitrile rubber, and there are residues in the wastewater of nitrile rubber production. Acrylonitrile is a colorless, bitter almond-flavored organic cyanide. It ranks fourth in the list of 52 priority toxic chemicals determined in my country. It has high toxicity and potential genotoxicity, and is an important harmful pollutant in the environment. one. In addition, acrylonitrile is also easy to volatilize, and acrylonitrile is listed as an organic substance that can be blown off in the lis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 吴颖郦和生秦会敏魏新冯婕谢文州
Owner CHINA PETROLEUM & CHEM CORP
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