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Restoration method suitable for soil polluted by polycyclic aromatic hydrocarbon, dioxin and pesticide

A pesticide-contaminated soil and soil-contaminated technology is applied in the field of polycyclic aromatic hydrocarbons, dioxins and pesticide-contaminated soil to meet the standards. It can solve the problems of insufficient chemical reaction and high chemical residue, so as to facilitate stacking and improve soil restoration. Efficiency, easy engineering popularization and application effect

Inactive Publication Date: 2020-06-19
中冶成都勘察研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the existing problem of high chemical residue due to insufficient chemical reaction in the repair process of refractory organic substances such as polycyclic aromatic hydrocarbons, dioxins and pesticides, the present invention provides a method suitable for polycyclic aromatic hydrocarbons, dioxins and pesticides. Remediation Methods of Pesticide Contaminated Soil

Method used

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  • Restoration method suitable for soil polluted by polycyclic aromatic hydrocarbon, dioxin and pesticide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The repairing method of the present embodiment comprises the steps:

[0047] (1) Send the polluted soil to the screening equipment for screening to remove the construction waste with a particle size larger than 50mm, and send the polluted soil after removing the construction waste to the crushing equipment for crushing to obtain fine-grained polluted soil with a particle size of ≤25mm;

[0048] (2) Thermal desorption of fine-grained contaminated soil;

[0049] (3) Add sodium persulfate to the fine-grained contaminated soil after thermal desorption treatment, the weight percentage of the sodium persulfate and the fine-grained soil is 0.05; then add an appropriate amount of water and stir evenly to obtain a moisture content of 25% dosing soil;

[0050] (4) Put the dosing soil in the hydrothermal reaction device, close the hydrothermal reaction device, raise the temperature of the sealed hydrothermal reaction device to 120 ° C, seal and keep it for 18 hours, and obtain th...

Embodiment 2

[0052] The repairing method of the present embodiment comprises the steps:

[0053] (1) Send the polluted soil to the screening equipment for screening to remove the construction waste with a particle size larger than 50mm, and send the polluted soil after removing the construction waste to the crushing equipment for crushing to obtain fine-grained polluted soil with a particle size of ≤25mm;

[0054] (2) Thermal desorption of fine-grained contaminated soil;

[0055] (3) Add sodium persulfate to the fine-grained contaminated soil after thermal desorption treatment, the weight percentage of the sodium persulfate and the fine-grained soil is 3.5; then add an appropriate amount of water and stir evenly to obtain a moisture content of 45% dosing soil;

[0056] (4) Put the dosing soil in the hydrothermal reaction device, close the hydrothermal reaction device, raise the temperature of the sealed hydrothermal reaction device to 450°C, seal and keep it warm for 0.5h, and obtain the ...

Embodiment 3

[0058] The repairing method of the present embodiment comprises the steps:

[0059] (1) Send the polluted soil to the screening equipment for screening to remove the construction waste with a particle size larger than 50mm, and send the polluted soil after removing the construction waste to the crushing equipment for crushing to obtain fine-grained polluted soil with a particle size of ≤25mm;

[0060] (2) Thermal desorption of fine-grained contaminated soil;

[0061] (3) Add sodium persulfate to the fine-grained contaminated soil after thermal desorption treatment, the weight percentage of the sodium persulfate and the fine-grained contaminated soil is 0.1; then add an appropriate amount of water and stir evenly to obtain a moisture content of 30% dosing soil;

[0062] (4) Put the dosing soil in the hydrothermal reaction device, close the hydrothermal reaction device, raise the temperature of the sealed hydrothermal reaction device to 250 ° C, seal and keep it for 7 hours, an...

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Abstract

The invention belongs to the technical field of soil remediation, discloses a restoration method suitable for soil polluted by polycyclic aromatic hydrocarbon, dioxin and pesticide, and aims to solvethe problem of high residual quantity of chemicals due to insufficient reaction of chemicals in the remediation process of refractory organic matters such as polycyclic aromatic hydrocarbon, dioxin and pesticides. Compared with the prior art, sodium persulfate can fully react with polycyclic aromatic hydrocarbon, dioxin, pesticides and other organic matters, thereby lowering the consumption of sodium persulfate and lowering the secondary pollution of the medicament (sodium persulfate). Meanwhile, in the process of reacting the sodium persulfate with refractory organic matters such as polycyclic aromatic hydrocarbon, dioxin and pesticides, any auxiliary raw material or catalyst does not need to be added.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a remediation method applicable to soil contaminated by polycyclic aromatic hydrocarbons, dioxins and pesticides. Up-to-standard remediation of contaminated soil. Background technique [0002] With the rapid economic development, a large number of land resources are polluted, and the treatment of polluted soil is also one of the important tasks at present. In polluted soil, the removal and remediation of organic matter is the difficulty of soil treatment. In particular, refractory organic substances such as polycyclic aromatic hydrocarbons, dioxins, and pesticides are difficult to remediate contaminated soil. [0003] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons PAHs) are volatile hydrocarbons produced during the incomplete combustion of coal, petroleum, wood, tobacco, organic polymer compounds and other organic substances, and are imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/06
CPCB09C1/06B09C1/08
Inventor 彭涛杨建李钦韬何剑奇王建伟
Owner 中冶成都勘察研究总院有限公司
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