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Method for removing glyphosate in wastewater

A technology for glyphosate and glyphosate wastewater, which is applied in the field of removing glyphosate in wastewater by using iron salt complex precipitation, can solve the problem that the total phosphorus is difficult to meet the discharge standard, and achieve low price, low treatment cost, and reduced The effect of total phosphorus

Inactive Publication Date: 2017-01-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the above treatment, the glyphosate content in the wastewater is still high, and the total phosphorus (TP) is difficult to meet the discharge standard. Therefore, it is particularly important to find an efficient and low-cost method for removing glyphosate in wastewater to reduce the total phosphorus.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select anhydrous ferric chloride as the complexing agent, and add it into the glyphosate wastewater whose total phosphorus concentration is 9 mg / L under magnetic stirring, wherein the molar ratio of ferric iron to total phosphorus is 6:1, that is, anhydrous The addition of ferric chloride is 0.28g / L, mix well, adjust the pH to be 4, let it stand for precipitation and filter, measure the content of glyphosate and total phosphorus in the filtrate, the result of the experiment is that the content of glyphosate is reduced by 49mg / L of raw water The removal rate of glyphosate and total phosphorus was 98.29% and 97.44%, respectively.

Embodiment 2

[0020] Select anhydrous ferric chloride as the complexing agent, and add it to glyphosate wastewater with a total phosphorus concentration of 15 mg / L under magnetic stirring, wherein the molar ratio of ferric iron to total phosphorus is 4:1, that is, anhydrous The addition of ferric chloride is 0.31g / L, mix well, adjust the pH to be 6, let stand and filter, and measure glyphosate and total phosphorus content in the filtrate. The removal rate of glyphosate and total phosphorus was 97.43% and 97.27%, respectively.

Embodiment 3

[0022] Select anhydrous ferric chloride as the complexing agent, and add it to glyphosate wastewater with a total phosphorus concentration of 92mg / L under magnetic stirring, wherein the molar ratio of ferric iron to total phosphorus is 4:1, that is, anhydrous The addition of ferric chloride is 1.93g / L, mix well, adjust the pH to be 6, let it stand for precipitation, filter, measure glyphosate and total phosphorus content in the filtrate, the experimental result is that the glyphosate content is 503mg / L by the raw water Reduced to 4.18mg / L, total phosphorus decreased from 92mg / L to 0.79mg / L, and the removal rates of glyphosate and total phosphorus were 99.17% and 99.14%, respectively, and the treatment effect was remarkable.

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Abstract

The invention relates to a method for removing glyphosate in wastewater. The method comprises the following steps: adding a right amount of complexing agent capable of specifically complexing glyphosate into glyphosate wastewater with a certain total phosphorus concentration, uniformly mixing, regulating the pH value to an acidic state, standing to precipitate, and filtering to obtain the treated wastewater. After wastewater is treated by the method, the total phosphorus removal rate is up to 97% or above, and the method can effectively remove glyphosate in the wastewater and lower the total phosphorus. By using the iron salt complexation precipitation to remove glyphosate in the wastewater, the method has the advantages of mild reaction conditions, low treatment cost, favorable effect and wide glyphosate wastewater concentration applicability, and is simple to operate.

Description

technical field [0001] The invention belongs to the field of organic wastewater treatment and relates to a method for removing glyphosate in wastewater by using iron salt complex precipitation. Background technique [0002] Glyphosate is currently the most widely used organophosphorus herbicide in the world. Its wastewater has large output, high phosphorus content and poor biodegradability. Glyphosate wastewater discharged that does not meet the standards will not only cause eutrophication of water bodies, but also have toxic effects on aquatic organisms, mammals, soil organisms, and amphibians, and infiltrate groundwater will seriously damage the ecological environment. [0003] my country successively issued Announcements No. 1158 and No. 1744, stipulating that the production of 10% glyphosate water preparations should be stopped before the end of 2009, and glyphosate mixed water preparations with a glyphosate content of less than 30% would no longer retain the original fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/00C02F1/66C02F101/38C02F101/34C02F101/30
CPCC02F1/001C02F1/5236C02F1/66C02F2101/306C02F2101/38C02F2101/34
Inventor 徐炎华刘志英杨帆陆雪梅
Owner NANJING UNIV OF TECH
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