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Method for recycling and treating wastewater from glyphosate production

A technology for the production and recycling of waste water, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of complex components and difficult treatment, and achieve high selectivity and reduce Pollution, effect of reducing difficulty of treatment

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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high salt content, high COD value, complex composition and difficult treatment of glyphosate production wastewater, there are many researches on the treatment of glyphosate wastewater at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The recovery treatment method of glyphosate production waste water of the present invention, the detailed steps of described recovery treatment method are as follows:

[0040] (1) Pretreatment of the adsorbent used:

[0041] a. Treatment of basic ion exchange fibers: put 10g of FFA-1 weakly basic ion exchange fibers in a stoppered Erlenmeyer flask with a concentration of 1 mol L -1 Soak in HCl solution, the soaking time is 5-10min, the amount of HCl solution added is 3 times the volume of the basic ion exchange fiber; after soaking, rinse with distilled water until neutral, and then use a concentration of 1mol L -1 Soak in NaOH solution for 5 to 10 minutes, and the amount of NaOH solution added is 3 times the volume of the basic ion exchange fiber; after soaking, wash with distilled water until neutral, and then dry to constant weight (the drying temperature is 50℃), for use;

[0042] b. Treatment of macroporous adsorption ion exchange resin: put 10g of D301 macropor...

Embodiment 2

[0056] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0057] (2) Pretreatment of glyphosate production wastewater:

[0058] The concentration of glyphosate production wastewater is 0.01mol L -1 NaOH solution to adjust its pH value to 11, and then adjust the initial mass concentration of glyphosate in glyphosate production wastewater to be 1.2% with mass concentration of 95% glyphosate;

[0059] (3) Weigh 3.0 g of FFA-1 weakly basic ion exchange fiber pretreated in step (1) and carry out wet packing to prepare a basic ion exchange fiber packed column;

[0060] (4) Continuously inject 200ml of glyphosate production wastewater pretreated in step (2) from the upper end of the adsorption column into the FFA-1 weakly basic ion-exchange fiber-packed column prepared in step (3) for adsorption, and glyphosate production The flow rate of wastewater is controlled at 1.2ml min -1 , the column temperature of the packed column was controlled at 30°C; the glyphosa...

Embodiment 3

[0062] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0063] (2) Pretreatment of glyphosate production wastewater:

[0064] The concentration of glyphosate production wastewater is 0.01mol L -1 The NaOH solution adjusts its pH value to 11;

[0065] (3) Weigh 5.0g of the D301 macroporous weakly basic styrene-based anion exchange resin pretreated in step (1) to carry out wet packing in the adsorption column, and place it on the upper end of the column to prepare activated carbon and D301 macroporous weakly basic styrene-based anion exchange resin packed column;

[0066] (4) Continuously inject 200ml of glyphosate production wastewater pretreated in step (2) from the upper end of the adsorption column into the FFA-1 weakly basic ion-exchange fiber-packed column prepared in step (3) for adsorption, and glyphosate production The flow rate of wastewater is controlled at 1.6ml min -1 , the column temperature of the packed column was controlled at 35°C; the ...

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Abstract

The invention discloses a method for recycling and treating wastewater from glyphosate production,. The method comprises the following steps: firstly pre-treating the required alkaline ion exchange fiber, ion exchange resin and activated carbon, then packing the pre-treated ion exchange fibre, ion exchange resin and activated carbon via wet packing method to obtain two packed columns, infusing the pre-treated production wastewater of glyphosate to the column packed with basic ion exchange fibre and the column packed with activated carbon and ion exchange resin in sequence adsorption, desorbing the two packed columns by NaOH solution after adequate adsorption, treating the recycled liquid obtained after desorption to obtain 30% original glyphosate, and recycling glycine therein. Through the technical scheme provided by the invention, glyphosate and glycine in wastewater can be recycled at normal temperature and the adsorption rate and desorption rate of glyphosate and glycine can both reach above 90%. The technical scheme provided by the invention not only realizes recycling of effective components, but also reduces the difficulty in subsequent treatment of the glyphosate wastewater so as to reduce the environmental pollution.

Description

technical field [0001] The invention relates to a wastewater treatment technology, in particular to a recovery and treatment method for glyphosate production wastewater. Background technique [0002] The pesticide industry is one of the major industries in the chemical industry. Organophosphorus pesticides play an important role in pesticides due to their broad spectrum and high efficiency, and are widely used. As the most widely used herbicide, glyphosate occupies about 30% of the entire herbicide market, and it is also the largest pesticide variety exported by my country. [0003] Glyphosate (N-(phosphinecarboxymethyl)glycine), also known as glyphosate or phosphoglycine in China. The method for producing glyphosate mainly contains glycine method, iminodiacetic acid method, dehydrogenation oxidation method and chloroacetic acid method etc., the production wastewater that the present invention relates to is the production wastewater of glycine method to prepare glyphosate,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04A01N57/20A01P13/00
Inventor 周彩荣李国鹏徐敏强王海峰蒋登高詹自力
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