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Novel process for zero discharge of glyphosate production waste water

A technology that produces waste water and zero discharge. It is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, phosphate, etc. It can solve the problems of membrane pollution, poor adaptability, and high operating costs.

Inactive Publication Date: 2011-06-01
BEIJING TUOFENG TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At first in China, the use of membrane separation technology to recover glyphosate in mother liquor was highly recommended, but the test showed that although (nanofiltration) membrane separation technology can desalt and concentrate dilute mother liquor, its adaptability is not strong, and not all glyphosate mother liquor Nanofiltration membranes can be used for concentration and separation, and there are still problems of membrane fouling and high operating costs
Although the use of anaerobic baffle reactors to treat wastewater from glyphosate production has the advantages of strong adaptability, the technology is still immature

Method used

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  • Novel process for zero discharge of glyphosate production waste water

Examples

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Effect test

Embodiment 1

[0015] Get the glyphosate production wastewater of a certain chemical plant, measure the total phosphorus (TP) of this wastewater to be 10200mg / L, the wastewater treatment steps are as follows:

[0016] 1) Take 1.5L of raw water, add sodium hydroxide to adjust pH=3, heat to 60°C, then add a small amount of ferrous sulfate and hydrogen peroxide (30% by mass, H2O2), add activated carbon, and pass through electromagnetic waves for 10 minutes.

[0017] 2) Take 700mL of the oxidized effluent from step 1), heat and evaporate until 100mL of the filtrate remains (equivalent to 7 times of concentration), take out the crystalline substance and weigh it, which is equivalent to 270.54g / L.

Embodiment 2

[0019] Get the glyphosate production wastewater of a certain chemical plant, measure the total phosphorus (TP) of this wastewater to be 10200mg / L, the wastewater treatment steps are as follows:

[0020] 1) Take 3L of raw water, add a certain amount of iron filings to soak for 24 hours, add sodium hydroxide to adjust pH=3, heat to 60°C, then add ferrous sulfate (FeSO4??7H2O) and hydrogen peroxide (30% by mass, H2O2), add activated carbon (accounting for 15% of the volume of wastewater), and pass the electromagnetic wave for 10 minutes.

[0021] 2) Take 2L of the oxidized effluent from step 1), heat and evaporate until 50mL of the filtrate remains (equivalent to 40 times of concentration), the crystallization effect is good, and no oil appears.

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Abstract

The invention discloses a novel process for zero discharge of glyphosate production waste water. Aiming at the characteristics that chemical oxygen demand (COD) concentration of glyphosate mother liquor is high, and the glyphosate mother liquor is difficult to degrade, a process of combing electromagnetism strong oxidization and multiple-effect evaporation concentration is adopted to carry out high-strength oxidation on glyphosate waste water under the action of an electromagnetic field, so that organophosphorus in the glyphosate production waste water is converted into orthophosphate, oxidized waste water is subjected to evaporation concentration, thereby recycling high value-added orthophosphate. By using the process, the zero discharge of the glyphosate production waste water can be reached, which meets the environment-friendly requirement.

Description

technical field [0001] The invention belongs to the field of wastewater treatment and discloses a new process for zero-discharge treatment of glyphosate production wastewater. Background technique [0002] Glyphosate is a broad-spectrum herbicide, and the current mainstream methods are IDA (IDAN) method and dimethyl ester method. In the production process of glyphosate, 5-6 tons of crystallization mother liquor will be produced for every ton of glyphosate produced. The composition of glyphosate mother liquor is very complex, which contains about 1%-2% glyphosate, 3%-4% glyphosate, 1% phosphite, and also contains CaCl2 and HCl, the total salinity is as high as 15%-20%, and a certain amount of triethylamine and organic by-products, etc., usually pH≤1. Therefore, the treatment of such pollutants is particularly important. The wastewater quality indicators are shown in Table 1: [0003] Table 1: Water quality indicators of glyphosate mother liquor [0004] color ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C01B25/26
Inventor 贾中华胡德禄宋金成
Owner BEIJING TUOFENG TECH DEV
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