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Method for repairing organochlorine pesticide-polluted soil through microwave-enhanced sodium percarbonate

A technology of pesticide-contaminated soil and sodium percarbonate, applied in the field of organic-contaminated soil remediation, can solve the problems of easy reaction with soil organic matter, large waste of Fenton's reagent, easy ineffective decomposition, etc., and achieves high efficiency and fast degradation speed. Effect

Inactive Publication Date: 2017-05-10
CHANGZHOU UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for using microwave technology to strengthen sodium percarbonate to restore organochlorine pesticide-contaminated soil, which solves the problems that the classic Fenton reagent is easy to react with soil organic matter in soil, prone to invalid decomposition, and the waste of Fenton reagent is large. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Prepare 40mL of muddy soil mixture (10g of soil, 50mg / kg of BHC in the soil, add 40mL of deionized water to make the water-to-soil mass ratio 4:1), add 0.2g of Tween to the mixture 80, and then successively add 0.1g sodium percarbonate, 0.05g sodium citrate and 0.05g ferrous sulfate. The muddy soil mixture was put into a microwave chemical reactor, and the microwave power was set to 200W. After 30 minutes, the degradation rate of BHC in the soil reached more than 85%.

example 2

[0021] Configure 50mL of mud mixture (10g of soil, the content of BHC in the soil is 100mg / kg, add 50mL of deionized water, so that the water-to-soil mass ratio is 5:1), add 0.25g of Triton 100 to the mixture , and then successively add 0.2g of sodium percarbonate, 0.1g of sodium citrate and 0.1g of ferrous sulfate. The muddy soil solution was put into a microwave chemical reactor, and the microwave power was set to 300W. After 20 minutes of reaction, the degradation rate of BCH in the soil reached more than 90%.

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PUM

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Abstract

The invention belongs to the technical field of organic polluted soil repairing engineering and discloses a method for repairing organochlorine pesticide-polluted soil through microwave-enhanced sodium percarbonate. The method comprises the steps of mixing the organochlorine pesticide-polluted soil into a mud-state soil mixture solution at a certain liquid-solid ratio, feeding a certain amount of surfactant, sodium percarbonate, sodium citrate and ferrous sulfate and carrying out microwave treatment and standing, wherein the degradation rate of an organochlorine pesticide in the soil can reach over 85%. The method has the advantages of being high in treatment efficiency, low in oxidant consumption, simple in process condition and low in operation requirements, and is suitable for the repairing of the organochlorine pesticide-polluted soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of organic polluted soil, and in particular relates to a method for remediating organochlorine pesticide-contaminated soil by using microwaves to strengthen sodium percarbonate. Background technique [0002] Since the signing of the "Stockholm Convention" and the implementation of my country's industrial policy of "retreating from the second to the third", a large number of chemical plants located in urban areas or areas along the river have been closed or moved away from the urban area, and a large number of polluted sites left behind urgently need to be treated and repaired before they can be reopened. Put into use. HC6, DDT and other organochlorine pesticides have the characteristics of refractory, high toxicity and high residue, and are difficult to be degraded by microorganisms or naturally attenuated under natural conditions. Therefore, the half-life in the soil is very long, and the orga...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08
Inventor 王明新齐今笛李心瑶周杰刘建国
Owner CHANGZHOU UNIV
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