Method for pretreating atrazine production wastewater

A technology for the production of wastewater and atrazine, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the problems of incomplete regeneration of activated carbon and failure to solve the problems of raw material recovery in wastewater , to achieve the effects of improving biochemical feasibility, reducing subsequent biochemical load, and good economic and social benefits

Active Publication Date: 2011-06-29
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] The 8m produced during the preparation of atrazine 3 Wastewater according to 2.7m 3 / h 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 3 hours, and the tail gas is absorbed by 60L hydrochloric acid (concentration 30%, the same below) , to obtain a mixture of ethylamine and isopropylamine hydrochloride, which contained 16.4kg of ethylamine and 21.5kg of isopropylamine, respectively, and was sent to the atrazine production section as a reaction raw material. After stripping, the ammonia nitrogen in the tower bottom wastewater dropped from 1293mg / L to 30mg / L, the COD dropped 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 concentrated sulfuric acid to adjust the pH value to 1.0, stir and react at room ...

Embodiment 2

[0024] The 8m produced during the preparation of atrazine 3 Wastewater according to 1.8m 3 / h 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 carried out for 4.5 hours, and the tail gas is absorbed by 60L hydrochloric acid to obtain ethylamine and isopropylamine The hydrochloride mixture was determined to contain 16.5kg of ethylamine and 21.6kg of isopropylamine respectively, and was sent to the atrazine production section as a reaction raw material. After stripping, the ammonia nitrogen in the tower bottom wastewater dropped from 1293mg / L to 25mg / L, the COD dropped 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 concentrated sulfuric acid to adjust the pH value to 2.0. After stirring and reacting at room tem...

Embodiment 3

[0027] The 8m produced during the preparation of atrazine 3 Wastewater according to 1.3m 3 / h 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, and the stripping is continued for 6 hours. The tail gas is absorbed by 60L hydrochloric acid aqueous solution to obtain ethylamine and isopropylamine The hydrochloride mixture was determined to contain 16.5kg of ethylamine and 21.6kg of isopropylamine respectively, and was sent to the atrazine production section as a reaction raw material. After stripping, the ammonia nitrogen in the tower bottom wastewater dropped from 1293mg / L to 20mg / L, the COD dropped 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 Add 32L of concentrated hydrochloric acid to the enamel kettle to adjust the pH value to 1.0. After stirring and reacting ...

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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 in particular 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 and unreacted ethylamine, isopropylamine, and sodium chloride. Emissions have become a difficult problem limiting the species and the sustainable development of the pesticide industry. Therefore, a variety of literatures have reported the treatment methods for atrazine production wastewater. Chinese patent application CN101698665A introduces a method for treating atrazine wastewater and recycling resources. In the method, atrazine in waste water is firstly adsorbed on activated carbon fibers, and then methanol is used as a desorbing agent to regenerate the active fibers, and finally the desorption liquid con...

Claims

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Application Information

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Patent Type & Authority Applications(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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