Technique for extracting and recovering wastewater of acephate pesticide

A technology for acephate and pesticide wastewater, applied in the direction of extraction water/sewage treatment, neutralization water/sewage treatment, chemical instruments and methods, etc., can solve the problem of high treatment cost, poor treatment effect, acetate and ammonia nitrogen Crude ammonium acetate can no longer be refined and used to achieve the effect of easy control and reduced treatment costs

Inactive Publication Date: 2007-10-10
SUZHOU DA LING ENVIRONMENTAL TECH CO LTD
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The treatment of this waste water has always been a difficult problem for various acephate pesticide manufacturers and environmental protection departments. Although some units use chemical or biological methods for treatment, they all give up because of the high cost of treatment and poor treatment effect. deal with
There are also units that use simple distillation to separate organic matter and ammonium acetate, but it has not been applied to practice because there is still a large amount of discharge of acetate and ammonia nitrogen and the obtained crude ammonium acetate cannot be refined and used.
Therefore, almost all production plants currently discharge in disorder or use a large amount of tap water to dilute the discharge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The processing steps of acephate pesticide wastewater treatment and recovery of acephate and inorganic ammonium salt, acetic acid are:

[0016] 1. Extracting the acephate pesticide wastewater with an organic solvent of lower halogenated hydrocarbon, the ratio of the solvent to the wastewater is 1:1, so as to extract the residual acephate pesticide in the wastewater. The extraction equipment is a rotary extraction tower. The extracted organic phase containing acephate is sent to the desolventization kettle to separate the solvent, and then sent to the crystallization kettle to crystallize to obtain the original drug of acephate. After the solvent is recovered and condensed, it returns to the extraction process for recycling. , the extracted wastewater contains less than 0.3% of acephate, and then sent to the acetic acid replacement process.

[0017] 2. Slowly add a certain amount of sulfuric acid to the waste water in proportion, replace the acetate in the waste water wi...

Embodiment 2

[0021] The processing steps of acephate pesticide wastewater treatment and recovery of acephate and acetate are:

[0022] 1. Extracting the methamidophos pesticide wastewater with an organic solvent of lower halogenated hydrocarbons, the ratio of the solvent to the wastewater is 1:1, so as to extract the residual acephate pesticide in the wastewater. The extraction equipment is a rotary extraction tower. The extracted organic phase containing acephate is sent to the desolventization kettle to separate the solvent, and then sent to the crystallization kettle to crystallize to obtain the original drug of acephate. After the solvent is recovered and condensed, it returns to the extraction process for recycling. . The extracted wastewater contains less than 0.3% of acephate, and then sent to the neutralization process.

[0023] 2. Send the extracted acephate wastewater to the neutralization device, add caustic alkali such as sodium hydroxide or potassium hydroxide to carry out ne...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

This invention discloses a process for treating acephate-containing pesticide wastewater, and recovering acephate, inorganic ammonium salt, acetic acid and acetate. The process comprises: extracting wastewater with a solvent, sending the organic phase containing acephate to a solvent-removal apparatus, removing the solvent, separating, crystallizing to obtain acephate, sending extracted wastewater to a displacer, adding a strong acid to displace ammonium acetate into acetic acid and inorganic ammonium salt, or sending extracted wastewater to a neutralization apparatus, adding caustic alkali, and neutralizing to obtain acetate. The method is economic and environmentally friendly, and has such advantages as easy control and stable operation.

Description

technical field [0001] The invention belongs to a new waste water treatment process, in particular to a process for treating acephate pesticide waste water and recovering acephate, inorganic ammonium salt, acetic acid and acetate. Background technique [0002] Acephate pesticide wastewater is a kind of wastewater generated during the production process of the highly efficient and low-toxic pesticide acephate. The wastewater is colorless or light yellow liquid, slightly viscous, with a strong pesticide odor. The main pollutant contents in the wastewater are: 2-4% of acephate, 20-30% of ammonium acetate, 4-8% of ammonium sulfate, 2-4% of other organic matter, and the comprehensive COD value of the wastewater is above 500,000 , and the waste water is extremely polluting to water bodies, and it is extremely lethal to fish and microorganisms at extremely low concentrations. It is estimated that the domestic annual production of this wastewater is 15,000-30,000 tons, and with th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/24C02F1/26C02F1/66
Inventor 陈兵
Owner SUZHOU DA LING ENVIRONMENTAL TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap