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Method for treating glyphosate waste water by using calcium hypochlorite waste water

A glyphosate wastewater and wastewater treatment technology, applied in the chemical industry, can solve the problems of high cost and complicated process, and achieve the effect of low cost, good treatment effect and simple operation

Active Publication Date: 2014-11-26
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment technologies for glyphosate wastewater at home and abroad mainly include the following categories: 1) Use methods such as feeding ammonia and carbon dioxide, adding ammonium bicarbonate, or heating and concentrating to remove sodium chloride in the wastewater, and then prepare it into grass Glyphosate ammonium salt (potassium salt) water or glyphosate water, did not fundamentally solve the pollution problem
2) Using membrane technology to separate and recover glyphosate, the process is complicated and the cost is high

Method used

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  • Method for treating glyphosate waste water by using calcium hypochlorite waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 5 parts of bleaching powder wastewater to a reactor containing 100 parts of glyphosate waste water in 0.2h under stirring at 25°C, continue to stir for 1h to make the two evenly mixed; then adjust the reaction temperature in the reactor Increase to 50°C and continue to stir and react for 6 hours to obtain a pretreatment liquid; add 0.14 parts of NaOH to the reactor containing the pretreatment liquid, cool and filter to obtain a colorless and transparent liquid with pH=8; then add 3.5 parts of anhydrous carbonic acid Sodium was added to the obtained filtrate under stirring at room temperature, and white calcium carbonate precipitate and colorless filtrate were obtained after filtration. The pH of the filtrate was adjusted to 7-9 with hydrochloric acid, and the filtrate was distilled to crystallize sodium chloride. The final liquid COD, TP, ammonia nitrogen and salt content were not detected.

Embodiment 2

[0022] Add 35 parts of bleaching powder wastewater to a reactor containing 100 parts of glyphosate wastewater in batches within 3 hours under stirring at 25°C, continue to stir for 1 hour to mix the two uniformly; then increase the reaction temperature in the reactor Continue to stir and react at 70°C for 4 hours to obtain a pretreatment liquid. Combine 0.8 parts of NaOH and Ca(OH) 2 The mixture is added to the reactor containing the pretreatment liquid, in which NaOH and Ca(OH) 2 The mass ratio is 2:1. After cooling and filtering, a colorless and transparent liquid with pH=9 is obtained; then 5.2 parts of anhydrous sodium carbonate are added to the filtrate under stirring at room temperature, and a white calcium carbonate precipitate and a colorless filtrate are obtained after filtration. , Adjust the pH value of the filtrate to 7-9 with hydrochloric acid, and distill the filtrate to crystallize sodium chloride. The final liquid COD, TP, ammonia nitrogen and salt content were ...

Embodiment 3

[0024] Add 105 parts of bleaching powder wastewater into a reactor containing 100 parts of glyphosate wastewater by continuous dripping within 4 hours under stirring at 50°C to mix the two evenly, and then continue to stir and react for 5 hours at a constant temperature to obtain Pretreatment liquid. 2.42 parts Ca(OH) 2 Add to the reactor equipped with pretreatment liquid, cool and filter to obtain a colorless and transparent liquid with pH=9; then add 8.6 parts of anhydrous sodium carbonate to the filtrate obtained under stirring at room temperature, and obtain white calcium carbonate precipitate and Colorless filtrate, adjust the pH value of the filtrate to 7-9 with hydrochloric acid, and distill the filtrate to crystallize sodium chloride. The final liquid COD, TP, ammonia nitrogen and salt content were not detected.

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Abstract

The invention relates to a method for treating glyphosate waste water by using calcium hypochlorite waste water. The method comprises the following steps: performing redox reaction on calcium hypochlorite waste water and glyphosate waste water, converting glyphosate and phosphite radical in the glyphosate waste water into inorganic phosphorus compounds, and combining with calcium ions in the treating liquid to form precipitate, so that the content and COD value of total phosphorus in a permeate can be reduced, and the purpose of treating glyphosate waste water can be achieved. Compared with the traditional treatment method, the method is good in effect and low in cost, the adopted treating liquid is waste water, so that the method is economic and environmentally friendly, capable of achieving the purposes of treating wastes with wastes and realizing comprehensive treatment, as well as is simple to operate, mild in conditions, and capable of performing large-scale treatment, and the treated waste water is in accord with the national emission standard and can be directly emitted.

Description

Technical field [0001] The invention belongs to the field of chemical industry and relates to a method for treating glyphosate wastewater, in particular to a method for treating glyphosate wastewater by bleaching powder concentrate wastewater. Background technique [0002] Glyphosate is an efficient, broad-spectrum, low-toxic, and safe biocidal herbicide. It produces a large amount of waste water during the production process. It has the characteristics of high organic content, high salt content, difficult biodegradation, and difficult treatment. Direct discharge will pollute the environment. Wastewater mainly contains glyphosate, phosphite, phosphate, glycine, methanol, formaldehyde and other components. [0003] At present, domestic and foreign treatment technologies for glyphosate wastewater mainly include the following categories: 1) The sodium chloride in the wastewater is removed by the methods of introducing ammonia and carbon dioxide, adding ammonium bicarbonate, or heating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/76
Inventor 张丹丹张文超李利燕李永刚苗刚马会娟陈海平
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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