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Treatment method for nitrile rubber production wastewater

A technology for the production of waste water and nitrile rubber, which is applied in biological water/sewage treatment, water/sewage treatment, natural water body treatment, etc. It can solve the problems of waste water treatment, difficult to degrade, no separate treatment of nitrile rubber production waste water, etc., to achieve Avoid pollution, prevent escape, and have remarkable treatment effects

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sodium sulfite can only react with the carbon-carbon double bond in acrylonitrile, and cannot destroy the cyano group. It just makes acrylonitrile undetectable, but cannot really change its toxicity, and the waste water is not really treated.
[0004] In addition, nitrile rubber production wastewater also contains a large amount of oligomers and various additives, the composition is complex and difficult to degrade
At present, there is no complete set of technologies that can separately treat the wastewater from the production of nitrile rubber to meet the discharge standards

Method used

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  • Treatment method for nitrile rubber production wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Add sodium sulfite heptahydrate to wastewater 1, and the dosage in 1L of wastewater is 2160mg. After 10 minutes, the above wastewater enters the Fenton oxidation unit, that is, adding H to the wastewater 2 o 2 and ferrous sulfate (as Fe 2+ Calculated), the dosage in 1L of wastewater is 689mg and 150mg respectively, the reaction time is 70min, after the reaction is completed, the pH value is adjusted to neutral, and the settling time is 20min. The supernatant enters the activated sludge treatment unit, that is, powdered activated carbon is added to the activated sludge (the weight ratio of powdered activated carbon to activated sludge is 0.12:1), and the sludge load is 0.23kgCOD / (kg sludge d ), the amount of activated sludge is 3200mg / L wastewater, the dissolved oxygen in the control treatment system is 2mg / L, the temperature is 35°C, the pH value is 6.5, and the hydraulic retention time is 14h. See Table 2 for the processing results.

Embodiment 2

[0042] Add anhydrous sodium sulfite to wastewater 2, and the dosage in 1L of wastewater is 1289mg. After 30 minutes, the above wastewater enters the Fenton oxidation unit, that is, adding H to the wastewater 2 o 2 and ferrous sulfate (as Fe 2+ Calculated), the dosage in 1L of wastewater is 981mg and 258mg respectively, the reaction time is 90min, after the reaction is completed, the pH value is adjusted to neutral, and the settling time is 30min. The supernatant enters the activated sludge treatment unit, that is, powdered activated carbon is added to the activated sludge (the weight ratio of powdered activated carbon to activated sludge is 0.17:1), and the sludge load is 0.24kgCOD / (kg sludge d ), the amount of activated sludge is 2800mg / L wastewater, the dissolved oxygen in the control treatment system is 4mg / L, the temperature is 25°C, the pH value is 7.5, and the hydraulic retention time is 16h. See Table 2 for the processing results.

Embodiment 3

[0044] Add anhydrous potassium sulfite to wastewater 3, and the dosage in 1L of wastewater is 1835mg. After 20 minutes, the above wastewater enters the Fenton oxidation unit, that is, adding H to the wastewater 2 o 2 and ferrous sulfate (as Fe 2+ The dosage in 1L of waste water is 1250mg and 298mg respectively, and the reaction time is 110min. After the reaction is completed, the pH value is adjusted to neutral, and the settling time is 35min. The supernatant enters the activated sludge treatment unit, that is, powdered activated carbon is added to the activated sludge (the weight ratio of powdered activated carbon to activated sludge is 0.15:1), and the sludge load is 0.33kgCOD / (kg sludge d ), the amount of activated sludge is 3000mg / L wastewater, the dissolved oxygen in the control treatment system is 3mg / L, the temperature is 30°C, the pH value is 7.0, and the hydraulic retention time is 12h. 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: a, mixing the nitrile rubber production wastewater and sulphite, so that acrylonitrile in the nitrile rubber production wastewater is converted into a sparingly volatile substance; b, performing advanced oxidation on the wastewater which is mixed with the sulphite, and performing solid-liquid separation; c, mixing the liquid phase separated in the step b and activated sludge. In the water treated by the method disclosed by the invention, the acrylonitrile content is low, the COD value is smaller than 50 mg / L, and the ammonia-nitrogen content is smaller than 5 mg / L; the water quality of outlet water is high; the treatment effect is remarkable. Moreover, acrylonitrile can be effectively prevented from escaping from the wastewater during a treatment process to avoid polluting the air.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment and 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. Although the monomer is recovered, it still remains 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/28C02F1/72C02F103/38
CPCC02F1/281C02F1/58C02F1/72C02F1/722C02F3/12C02F9/00C02F2101/38C02F2103/38C02F2305/026
Inventor 吴颖郦和生王岽魏新冯婕
Owner CHINA PETROLEUM & CHEM CORP