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Method for repairing heavy metal contaminated soil

A technology that pollutes soil and heavy metals, applied in the field of soil remediation, can solve problems such as permanent removal of heavy metals

Inactive Publication Date: 2020-04-21
山东碧泉环境工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of method for repairing heavy metal polluted soil, to solve the problem of permanent removal of heavy metals in the soil proposed in the above-mentioned background technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0017] (1) Take heavy metal mixed contaminated soil, place heavy metal mixed contaminated soil in a high temperature and high pressure reactor, then add organic solvent to the soil and feed carbon dioxide gas, the mass part of soil and the volume part ratio of organic solvent are 1:6, The organic solvent is ethanol, which is heated and pressurized to the supercritical state of carbon dioxide; the critical temperature is 60 degrees Celsius, and the critical pressure is 29.4MPa

[0018] (2) The soil was rinsed for 20 minutes by spraying 2-thienoyltrifluoroacetone into the high-temperature and high-pressure reactor. The concentration of 2-thienoyltrifluoroacetone sprayed was 0.005M.

Embodiment 2

[0020] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0021] (1) Take heavy metal mixed contaminated soil, place heavy metal mixed contaminated soil in a high temperature and high pressure reactor, then add organic solvent to the soil and feed carbon dioxide gas, the mass part of soil and the volume part ratio of organic solvent are 1:6, The organic solvent is ethanol, which is heated and pressurized to the supercritical state of carbon dioxide; the critical temperature is 70 degrees Celsius, and the critical pressure is 29.8 MPa

[0022] (2) The soil was rinsed for 45 minutes by spraying 2-thienoyltrifluoroacetone into the high-temperature and high-pressure reactor. The concentration of 2-thienoyltrifluoroacetone sprayed was 0.01M.

Embodiment 3

[0024] A method for repairing heavy metal contaminated soil, comprising the steps of:

[0025] (1) Take heavy metal mixed contaminated soil, place heavy metal mixed contaminated soil in a high temperature and high pressure reactor, then add organic solvent to the soil and feed carbon dioxide gas, the mass part of soil and the volume part ratio of organic solvent are 1:6, The organic solvent is ethanol, which is heated and pressurized to the supercritical state of carbon dioxide; the critical temperature is 60 degrees Celsius, and the critical pressure is 29.5MPa

[0026] (2) The soil was rinsed for 30 minutes by spraying 2-thienoyltrifluoroacetone into the high-temperature and high-pressure reactor. The concentration of 2-thienoyltrifluoroacetone sprayed is 0.005MM.

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PUM

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Abstract

The invention discloses a method for repairing heavy metal contaminated soil. The method relates to the technical field of soil remediation, and comprises the following steps: (1) taking heavy metal mixed contaminated soil, putting the heavy metal mixed contaminated soil into a high-temperature and high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, and heating and pressurizing the carbon dioxide gas to a supercritical state of carbon dioxide, and (2) spraying 2-thiophenyltrifluoroacetone into the high-temperature and high-pressure reaction kettle to leach the soil for a period of time. Through combined use of supercritical carbon dioxide and 2-thiophenyltrifluoroacetone (TTA), chelating of Cu, Zn, Ni and other heavy metal ions in soil isachieved, and the effect of soil remediation is achieved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating heavy metal polluted soil. Background technique [0002] Soil is the most active layer of the earth's surface system, the cornerstone for human survival and development, and an important material basis for ensuring the safety of human food and ecological environment. With the development of industry and the modernization of agricultural production, heavy metal pollution in soil has become one of the main problems that endanger the quality of the global environment. Heavy metal elements are potential pollutants, which are difficult to be degraded by soil microorganisms. Once they enter the soil, it is very difficult to treat them. Soil heavy metal pollution mainly comes from industrial production, agricultural production and transportation. They not only lead to the decline of soil vitality and reduce food production, but also can accumulate in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 李惠生王国青刘骁勇
Owner 山东碧泉环境工程技术有限公司
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