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Method for synergistically remediating soil contaminated by organo-chlorine pesticide through nanoscale zero-valent iron/calcium peroxide

A technology of pesticide-contaminated soil and nano-zero-valent iron, applied in the restoration of contaminated soil, etc., can solve the problems of multi-organochlorine pesticide degradation, incompleteness, waste of hydrogen peroxide, etc., and achieve the effect of simple process conditions

Inactive Publication Date: 2017-04-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for synergistically repairing organochlorine pesticide-contaminated soil by using nanometer zero-valent iron / calcium peroxide, which solves the problem that the classic Fenton reagent wastes more hydrogen peroxide in soil and does not completely degrade organochlorine pesticides question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Take 10g of contaminated soil with a BHC content of 50mg / kg and put it into a 250mL conical flask, add 40mL of deionized water to make a muddy soil mixed solution, so that the soil liquid-solid mass ratio is 4:1, and then add 5mg citric acid, 0.1g calcium peroxide and 0.1g nano zero-valent iron. Put the Erlenmeyer flask containing the muddy soil mixed solution into a constant temperature shaking box, set the speed at 180r / min, and shake for 12h. The degradation rate of HCH in soil has reached over 85%.

example 2

[0022] Take 10g of contaminated soil with a BHC content of 100mg / kg and put it in a 250mL conical flask, add 50mL of ionized water to make a muddy soil mixed solution, make the soil liquid-solid mass ratio 5:1, add 5mg successively Citric acid, 0.1g nanometer zero valent iron and 0.2g calcium peroxide. Put the Erlenmeyer flask containing the muddy soil mixed solution into a constant temperature shaking box, set the rotating speed at 180r / min, shake for 24 hours, and the degradation rate of BCH in the soil can reach more than 90%.

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PUM

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Abstract

The invention belongs to the technical field of remediation works of organic contaminated soil, and discloses a novel method for remediating site soil contaminated by organo-chlorine. The method comprises the steps of preparing soil contaminated by an organo-chlorine pesticide into slurry soil mixed solution; adding certain amounts of citric acid, nanoscale zero-valent iron and calcium peroxide; and oscillating the materials for 3 h to 24 h, so as to enable the degradation rate of the organo-chlorine pesticide in soil to reach 85% or above. The method has the advantages that treatment efficiency is high, pollutants are completely degraded, waste of an oxidizing agent is low, technological conditions are simple, operation requirements are low, and the like, and the method is applicable to remediation of soil contaminated by the organo-chlorine pesticide.

Description

technical field [0001] The invention belongs to the technical field of remediation of organic polluted sites, and in particular relates to a method for synergistically remediating soil polluted by organochlorine pesticides by using nanometer zero-valent iron and calcium peroxide. Background technique [0002] Since the implementation of the industrial policy of "retire two and enter three" in our country, a large number of chemical factories have moved out of the city, stationed in industrial parks or moved to the suburbs of the city. Among them, soil contaminated by typical organochlorine pesticides such as HCH and DDT is very difficult to treat due to the characteristics of organochlorine pesticides such as high toxicity, high residue, and refractory degradation. It has become one of the difficulties in soil treatment and restoration of industrially polluted sites. If the soil of such polluted sites is not properly treated and restored, it will bring serious potential harm...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 王明新姚静波荀志祥刘建国
Owner CHANGZHOU UNIV
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