Method for nanofiltration separation and comprehensive utilization of glyphosate mother liquor

Abstract

The invention discloses a method which is suitable for the separation and the comprehensive utilization of components of glyphosate mother liquor. The method adopts three-stage nanofiltration separation glyphosate mother liquor, the concentrated water side of a nanofiltration membrane is provided with glyphosate concentrated liquor, and percolate of the nanofiltration membrane is concentrated sodium chloride solution. First stage nanofiltration concentrated liquor is diluted by water and then is led into a second stage nanofiltration; and second stage nanofiltration concentrated liquor is diluted by water and then is led into a third stage nanofiltration. The glyphosate solution concentrated by the three-stage nanofiltration is recycled to be used as water for rinsing products. The concentrated sodium chloride solution which is processed by three-stage nanofiltration permeation contains micromolecule organic matters and is processed by the photocatalysis-chemical oxidation method to obtain brine to be used as a raw material for producing sodium hudroxide. The method carries out the operation of three-stage nanofiltration separation and photocatalysis-chemical oxidation on the glyphosate mother liquor, can realize the zero release comprehensive utilization of the glyphosate mother liquor, and has outstanding economic and environmentally friendly benefits.

Description

technical field [0001] The invention specifically relates to a method for nanofiltration separation and comprehensive utilization of glyphosate wastewater, which belongs to the technical field of environmental engineering and also belongs to the technical field of chemical engineering. Background technique [0002] Glyphosate is a high-efficiency and low-toxic herbicide, and it is a special phosphorus chemical product with high price and high demand. Due to its promising market prospects and high profits, within a few years, the number of domestic manufacturers has rapidly grown to more than 3,000. However, the glyphosate mother liquor, the process wastewater discharged from the glyphosate production process, has the characteristics of high salt content, high concentration of organic matter, and high density. For this kind of wastewater, there is no effective treatment method at present. Once discharged, it will cause serious pollution to water and soil, and cause serious d...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to adopt appropriate technical measures to separate and treat glyphosate wastewater with high content of sodium chloride and glyphosate, recycle resources with economic value, realize waste water recycling, and avoid serious waste water discharge. water and soil pollution problems

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