Method for treating glyphosate waste water

Abstract

The invention discloses a method for treating glyphosate waste water. The method comprises the follow steps: firstly, adjusting the pH value of the glyphosate waste water to 1.0 with hydrochloric acid, and then obtaining a clear and transparent filter liquor through an adsorption method; secondly, adding calcium chloride to the filter liquor to control the pH valve of the filter liquor is larger than 8.0, and filtering the filter liquor to separate an organic calcium sediment; then, adjusting the pH value of the obtained filter liquor to 4.0-5.0, adding ferric hydroxide particles to the filter liquor, and filtering the filter liquor to separate a brown-orange solid sediment; finally, adjusting the pH value of the filter liquor to 7.0-8.0 with sodium hydroxide, adding transitional metal ions to the filter liquor, and obtaining the completely treated glyphosate waste water through chelate resin. The method has the advantages that the operation of the whole process is simple; the cost is low; the feasibility is high. Especially, a small amount of glyphosate is subjected to complexing precipitation through the ferric hydroxide particles; on the basis of the complexing principle, a small quantity of organic matters are subjected to adsorption treatment through the chelate resin, so that in the completely treated glyphosate waste water, the phosphorus content is lower than 1.0 mg / L, the carbon content is lower than 100 mg / L, the nitrogen content is lower than 20 mg / L; the COD (Carbon Doped Oxide) content is lower than 200 mg / L.

Description

technical field [0001] The invention relates to a treatment method for glyphosate wastewater. Background technique [0002] Glyphosate is one of the most widely used herbicides at present, and in the production of glyphosate, a large amount of hydrochloric acid and sodium hydroxide are required, which leads to the discharge of a large amount of chlorine containing high concentration in the production process sodium chloride wastewater. Since the Ministry of Agriculture announced No. 1158 that 10% glyphosate aqueous solution will be completely withdrawn from the market after January 1, 2012, many glyphosate manufacturers have had to treat glyphosate wastewater. At present, most enterprises mainly use the following methods to treat glyphosate wastewater: calcium oxide precipitation method, membrane filtration method, distillation concentration method and biochemical method, but they all have some shortcomings, such as: [0003] (1) When calcium oxide is used for precipitatio...

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Problems solved by technology

[0004] (2) When the membrane filtration method is used, although the treatment effect is better, it is generally difficult to achieve the requirement of a daily processing capacity of more than 200 tons due to its slow processing speed; especially the used nanofiltration membrane cannot be regenerated, so this method The cost of treatment is high, and the glyphosate in the wastewater cannot be effectively recovered, which easily leads to waste of resources

[0005] (3) When adopting the distillation concentration method, this method also faces the problem that the processing speed is slow, the cost is high, and the glyphosate in the waste water cannot be effectively recovered

[0006] (4) When using the biochemical method, because the glyphosate wastewater contains high concentration of sodium chloride, its biochemical effect is poor, it needs to be diluted or other pretreatment, and it is necessary to further treat the biochemical method. post-treatment of wastewater

Moreover, the biochemical method has high requirements on conditions, is not easy to control, and cannot effectively recover glyphosate in wastewater

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