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Method for pretreating atrazine production wastewater

A technology for producing wastewater and atrazine, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., which can solve the problems such as the inability to completely regenerate activated carbon and the recovery of raw materials in wastewater. , to achieve the effect of improving biochemical feasibility, reducing subsequent biochemical load, and simple treatment methods

Active Publication Date: 2012-02-29
中国中化股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can recover atrazine, it still does not solve the problem of raw material recovery in wastewater, and methanol elution cannot completely regenerate activated carbon, and it needs to be reprocessed after a certain number of uses.

Method used

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  • Method for pretreating atrazine production wastewater
  • Method for pretreating atrazine production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 8m produced during the preparation of atrazine 3 Waste water is 2.7m 3 / h The speed is continuously transported from the top of the tower to the air stripping tower in the form of spraying. Compressed air is blown in from the bottom of the tower. The gas-liquid ratio is 1000. Continuous stripping for 3h. The tail gas is absorbed by 60L hydrochloric acid (concentration 30%, the same below) , The mixture of ethylamine and isopropylamine hydrochloride was obtained, and it was determined that it contained 16.4kg of ethylamine and 21.5kg of isopropylamine, respectively, and sent to the atrazine production section as reaction materials. After stripping, the ammonia nitrogen in the bottom wastewater was reduced from 1293mg / L to 30mg / L, the COD was reduced from 3272mg / L to 1200mg / L, and the pH value was 8.5.

[0022] After blowing off, the waste water is sent to 10m 3 In the enamel kettle, add 16.0L of concentrated sulfuric acid to adjust the pH to 1.0, stir and react at room tempe...

Embodiment 2

[0024] 8m produced during the preparation of atrazine 3 Waste water is 1.8m 3 / h The speed is continuously transported from the top of the tower to the air stripping tower in the form of spraying. Compressed air is blown in from the bottom of the tower. The gas-liquid ratio is 800. Continuous stripping is 4.5h. The tail gas is absorbed by 60L hydrochloric acid to obtain ethylamine and isopropylamine. The hydrochloride mixture was determined to contain 16.5 kg of ethylamine and 21.6 kg of isopropylamine, and sent to the atrazine production section as the reaction raw material. After stripping, the ammonia nitrogen in the bottom wastewater was reduced from 1293mg / L to 25mg / L, the COD was reduced from 3272mg / L to 1150mg / L, and the pH value was 8.0.

[0025] After blowing off, the waste water is sent to 10m 3 In the enamel kettle, add 8.0L of concentrated sulfuric acid to adjust the pH to 2.0. After stirring and reacting at room temperature for 2.5 hours, most of the atrazine in the w...

Embodiment 3

[0027] 8m produced during the preparation of atrazine 3 Waste water is 1.3m 3 / h The speed is continuously transported from the top of the tower to the air stripping tower in the form of spraying. Compressed air is blown in from the bottom of the tower. The gas-liquid ratio is 800. Continuous stripping for 6h. The tail gas is absorbed by 60L hydrochloric acid aqueous solution to obtain ethylamine and isopropylamine. The hydrochloride mixture was determined to contain 16.5 kg of ethylamine and 21.6 kg of isopropylamine, and sent to the atrazine production section as the reaction raw material. After stripping, the ammonia nitrogen in the bottom wastewater was reduced from 1293mg / L to 20mg / L, the COD was reduced from 3272mg / L to 1124mg / L, and the pH value was 7.5.

[0028] After blowing off, the waste water is sent to 10m 3 In the enamel kettle, add 32L of concentrated hydrochloric acid to adjust the pH to 1.0. After stirring and reacting at room temperature for 2.5 hours, most of th...

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Abstract

The invention discloses a method for pretreating atrazine production wastewater. The method comprises the following steps of: 1) recovering ethylamine and isopropamide in wastewater through air rectification; and 2) recovering atrazine in the wastewater through acid separation. The pretreatment method is simple and practicable; and by the method, reclamation of the wastewater is realized. Ammonium salt recovered by a blowoff process can be directly applied to production; and the atrazine recovered by an acid separation process can be directly applied to processing atrazine wettable powder. The atrazine content of the wastewater pretreated by the method is less than 3 mg / L and reaches the workshop emission standard of national 'Heterocyclic Pesticide Industrial Water Pollutant Emission Standard'; over 75 percent of chemical oxygen demand (COD) is removed in the process; biochemical practicality is obviously improved; and subsequent biochemical load is reduced.

Description

Technical field [0001] The invention belongs to the field of pesticide production wastewater treatment, and specifically relates to a pretreatment method for atrazine production wastewater. Background technique [0002] Atrazine, also known as atrazine, is a heterocyclic pesticide. The main pollutants in the wastewater discharged from its production plant are atrazine, unreacted ethylamine, isopropylamine, and sodium chloride. Emissions have become a problem in restricting this species and the sustainable development of the pesticide industry. Therefore, a variety of literature has reported on the treatment of atrazine production wastewater. Chinese patent application CN101698665A introduces a method for atrazine wastewater treatment and resource recycling. The method first adsorbs the atrazine in the wastewater on the activated carbon fiber, and then uses methanol as a desorption agent to regenerate the activated fiber, and finally distills the desorption liquid containing hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C07D251/50
Inventor 程迪马文静张立君许淑娟
Owner 中国中化股份有限公司
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