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Method for treating N-(phosphonomethyl)iminodiacetic acid wastewater

A treatment method and technology of glyphosate, applied in natural water treatment, heating water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of waste of resources, poor biochemical treatment effect, high salt content, and reduce COD. and salt content, harmless treatment, cost reduction effect

Active Publication Date: 2010-06-02
JINGBO AGROCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the synthesis reaction process of diglyphosate, the diglyphosate mother liquid wastewater produced during centrifugation and centrifugal washing contains pollutants such as diglyphosate, formaldehyde, HCl, NaCl, phosphorous acid, etc., its pH is about 1, and its COD is about 100,000mg / L , the formaldehyde content is about 2%, the salt content is about 20%, mainly NaCl, the water quality is characterized by high COD concentration, high salt content, and poor biochemical properties, although physical treatment methods and biochemical methods have been developed etc. to solve the pollution problem of the water, but due to more or less defects in these methods, the treatment of the wastewater has not been well resolved
[0003] For example: using ordinary multi-effect evaporation technology to concentrate and distill wastewater, but the evaporated salt contains a large amount of organic matter, which belongs to solid waste, and the active ingredients in it cannot be recovered in time, and need to be processed many times, which causes waste of resources , increasing the processing cost
[0004] Treatment methods such as precipitation method, filtration method, foam combined with biochemical method and other technical means cannot effectively remove a large amount of salt in wastewater, resulting in extremely poor biochemical treatment effect and cannot fundamentally solve the treatment problem

Method used

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  • Method for treating N-(phosphonomethyl)iminodiacetic acid wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A pesticide factory in Shandong produces 5 tons of glyphosate wastewater per hour, which is treated and recycled using the technology provided by the invention. The process is as follows:

[0017] Diglyphosate mother liquor COD is 100000mg / L, first filtered, introduced into the dosing tank through a lift pump, added to the dosing tank at the rate of 37.5kg sodium nitrite per hour and 72.5kg sodium chlorate per hour, and stirred for 30min. Control the water inflow at 5 tons / hour, pour water into the multi-effect evaporator, control the temperature in the primary evaporator at about 70°C, and the vacuum degree at about -0.09Mpa, continuously feed water during the evaporation process, and the first-stage residence time is about After 20 minutes, it enters the second stage evaporation, the temperature is controlled at about 90°C, the vacuum degree is about -0.05Mpa, and the temperature is raised to further catalyze the oxidation. Further increase the temperature, and the re...

Embodiment 2

[0020] A pesticide factory in Shandong produces 15 tons of glyphosate wastewater per hour, which is treated and recycled using the technology provided by the invention. The process is as follows:

[0021] Diglyphosate mother liquor COD is 100000mg / L. Firstly, it is filtered and then introduced into the dosing tank through a lifting pump. The dosage of 160kg sodium nitrite per hour and 200kg sodium chlorate per hour is added to the dosing tank, stirred for 50min, and controlled. The water volume is 15 tons / hour, and the water is poured into the multi-effect evaporator. The temperature in the first-stage evaporator is controlled at about 65°C, and the vacuum degree is about -0.08Mpa. Water is continuously fed during the evaporation process, and the first-stage residence time is about 25 minutes. , enter the secondary evaporation, the temperature is controlled at about 95°C, the vacuum degree is about -0.05Mpa, the temperature is raised to further catalyze the oxidation, and the r...

Embodiment 3

[0024] A pesticide factory in Jiangsu produces 8 tons of glyphosate wastewater per hour, which is treated and recycled using the technology provided by the invention. The process is as follows:

[0025] Diglyphosate mother liquor COD is 120000mg / L. First, after filtering, it is introduced into the dosing tank through a lift pump, and is added to the dosing tank at the dosage of 42kg sodium nitrite per hour and 102kg sodium chlorate per hour, and stirred for 60min to control the feeding time. The water volume is 8 tons per hour, and then the water is poured into the multi-effect evaporator. The temperature in the first-stage evaporator is controlled at about 75°C, the vacuum degree is about -0.09Mpa, water is continuously fed during the evaporation process, and the first-stage residence time is about 25 Minutes, enter the secondary evaporation, the temperature is controlled at about 100 ° C, the vacuum is about -0.05Mpa, the temperature is raised to further catalyze the oxidatio...

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Abstract

The invention relates to a wastewater treatment process, in particular to a method for treating N-(phosphonomethyl)iminodiacetic acid wastewater by a coupling catalytic oxidation technology. The method comprises the following concrete steps of: adding catalytic oxidizers of sodium nitrite and sodium hypochlorite into the N-(phosphonomethyl)iminodiacetic acid wastewater in a mixing tank, filtering after stirring evenly, putting the wastewater into a multi-effect evaporation device, concentrating under the conditions that the temperature is 65-100 DEG C and the vacuum degree is from -0.05MPa to -0.09MPa and crystallizing a concentrate under the condition that the COD concentration of effluent water is below 5000mg / L to precipitate sodium chloride which can reach the standard of industrial salt. The invention has simple and convenient operation, strong controllability, simple equipment, cost reduction, less energy consumption and no secondary pollution; the invention is suitable for treating and reclaiming the N-(phosphonomethyl)iminodiacetic acid wastewater.

Description

technical field [0001] The invention relates to a waste water treatment technology. Specifically, sodium nitrite and sodium hypochlorite are used as catalytic oxidants, and a multi-effect evaporation system is used to treat bisglyphosate waste water, which is suitable for the field of pesticide waste water treatment. Background technique [0002] In the synthesis reaction process of diglyphosate, the diglyphosate mother liquid wastewater produced during centrifugation and centrifugal washing contains pollutants such as diglyphosate, formaldehyde, HCl, NaCl, phosphorous acid, etc., its pH is about 1, and its COD is about 100,000mg / L , the formaldehyde content is about 2%, the salt content is about 20%, mainly NaCl, the water quality is characterized by high COD concentration, high salt content, and poor biochemical properties, although physical treatment methods and biochemical methods have been developed etc. to solve the pollution problem of the water, but because these met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/72C02F1/76C02F103/36
Inventor 戴荣华蒋文强王宗张建林房立彬
Owner JINGBO AGROCHEM TECH CO LTD
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