Method for treating glyphosate waste water and reducing the emission of carbon dioxide

Abstract

The invention relates to a method for treating glyphosate waste water and reducing the emission of carbon dioxide. The glyphosate waste water is obtained by extracting glyphosate after the N-phosphonomethyliminodiacetic acid is oxidized in the process of preparing the glyphosate by using an iminodiacetic acid method. Urotropine finished products are prepared by the following steps: (1) adding alkali into the glyphosate waste water, and adjusting and controlling the pH value to between 3 and 5 to obtain corresponding formate solution; (2) performing condensing separation on the solution of the step (1) by a film integration method to obtain 5 to 25 percent formate solution and 0.5 to 5 percent obenzaldehyde water solution (1); (3) performing evaporating, dehydration and solid-liquid separation on the formate solution of the step (2) to obtain formate wet powder and 0.5 to 5 percent benzaldehyde water solution (2), and drying the formate wet powder to obtain the finished product; (4) adding ammonia accounting for 1.5 to 3 percent the benzaldehyde water solution (1) and the benzaldehyde water solution (2) to obtain 0.3 to 4 percent urotropine water solution, and improving the concentration of the urotropine to between 10 and 25 percent by film separation; and (5) evaporating, separating and drying the urotropine solution to obtain the urotropine finished product.

Description

technical field [0001] The invention relates to a glyphosate wastewater treatment method for reducing carbon dioxide emissions, and belongs to the field of wastewater treatment method manufacturing. Background technique [0002] The patent with the application number: 200810048470.X provides a method for producing urotropine by reacting the waste water with ammonia, but since the method does not remove formic acid, the waste water needs further biochemical treatment, and the produced urotropine has impurities Most of them need to be refined, which leads to problems such as long processing flow and high cost. The patent with application number 200810212211.6 discloses a treatment method for this wastewater: use alkali to react with formic acid to produce formate to remove formic acid or raise the temperature to 80-250°C to remove formic acid, and use hydrogen peroxide to oxidize or add urea to remove formaldehyde or the method of adding ammonia to produce urotropine to remov...

AI Technical Summary

Problems solved by technology

But there are following problems in this method: 1, the pH value of adding alkali to remove formic acid must be more than 5.0, and the alkali consumption is big, simultaneously because the pH is high, the formaldehyde in the waste water after alkali treatment can't generate urotox by adding ammonia 2, remove formaldehyde with the heating method or add hydrogen peroxide method to remove formaldehyde will produce a large amount of carbon dioxide, damage the environment, and consume a lot of energy and resources; 3, the method of removing formaldehyde with ammonia production of urotropine Formic acid is not pre-removed, ammonium formate is mixed in urotropine, the quality is not high