CN111036667A - Method for repairing heavy metal contaminated soil - Google Patents
Method for repairing heavy metal contaminated soil Download PDFInfo
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- CN111036667A CN111036667A CN201911159144.0A CN201911159144A CN111036667A CN 111036667 A CN111036667 A CN 111036667A CN 201911159144 A CN201911159144 A CN 201911159144A CN 111036667 A CN111036667 A CN 111036667A
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- soil
- heavy metal
- carbon dioxide
- contaminated soil
- reaction kettle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for restoring heavy metal contaminated soil, which relates to the technical field of soil restoration and comprises the following steps: (1) taking heavy metal mixed polluted soil, placing the heavy metal mixed polluted soil in a high-temperature high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, and heating and pressurizing to a supercritical state of carbon dioxide; (2) and (3) spraying 2-thenoyltrifluoroacetone into the high-temperature high-pressure reaction kettle to drip wash the soil for a period of time. According to the invention, by combining the supercritical carbon dioxide and the-Thenoyl Trifluoroacetone (TTA), the chelation of heavy metal ions such as Cu, Zn, Ni and the like in soil is realized, and the effect of soil remediation is achieved.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a method for remediating heavy metal contaminated soil.
Background
The soil is the most active circle layer of the earth surface system, is a foundation stone on which human beings live and develop, and is an important material foundation for guaranteeing the safety of human food and ecological environment. With the industrial development and the modernization of agricultural production, heavy metal pollution in soil has become one of the major problems endangering the global environmental quality. Heavy metal elements are potential pollutants and are difficult to be degraded by soil microorganisms, and once the heavy metal elements enter the soil, the heavy metal elements are difficult to treat. The heavy metal pollution of soil mainly comes from industrial production, agricultural production and transportation. They not only cause a reduction in soil viability and a reduction in food production, but also can accumulate in plants and motiles and enter the food chain, endangering human health. More seriously, these stains are characterized by long-term, covert, and irreversible properties. Investigation results of 'national soil pollution condition survey bulletin' in 2014 and 'geochemistry survey report' in 2015 show that more than 8% of farmland soil is polluted by heavy metals in different degrees, and the effective stripping, removing and repairing technology of the heavy metals in the soil is a worldwide technical problem. At present, the soil heavy metal restoration technology at home and abroad mainly comprises ex-situ restoration, stabilization treatment, heat treatment and the like. The cost of soil ex-situ remediation is high, soil loses the ecological function of the soil due to soil heat treatment, chemical leaching and stabilization technologies, and the remediation process of the soil polluted by metals is restricted by a plurality of problems such as plant treatment of the soil phytoremediation technology. The above-mentioned technologies are undoubtedly the "palliative treatment" of soil remediation, and the reason for adopting these technologies is that the permanent removal of heavy metals from soil is a technical bottleneck and a breakthrough in soil remediation. The permanent heavy metal removal soil in-situ remediation technology which is economic and feasible, reliable in technology, free of influence on grain production and damage on the quality of cultivated land is an urgent need of governments, farmers and the masses.
Disclosure of Invention
The invention aims to provide a method for repairing heavy metal contaminated soil, which aims to solve the problem of permanent removal of heavy metals in the soil in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for remediating heavy metal contaminated soil comprises the following steps:
(1) taking heavy metal mixed polluted soil, placing the heavy metal mixed polluted soil in a high-temperature high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, and heating and pressurizing to a supercritical state of carbon dioxide;
(2) and (3) spraying 2-thenoyltrifluoroacetone into the high-temperature high-pressure reaction kettle to drip wash the soil for a period of time.
Further, the ratio of the mass part of the soil to the volume part of the organic solvent in the step (1) is 1: 6.
Further, the heavy metal mixed polluted soil is sandy soil or acid soil with more free heavy metal ions.
Further, in the step (1), the critical temperature of the supercritical state is 60-70 ℃ and the critical pressure is 29.4-29.8 MPa.
Further, the treatment time of the soil in the step (2) in the high-temperature high-pressure reaction kettle is 20-45 minutes.
Further, the concentration of the 2-thenoyltrifluoroacetone sprayed in the step (2) is 0.005M-0.01M.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by combining the supercritical carbon dioxide and the-Thenoyl Trifluoroacetone (TTA), the chelation of heavy metal ions such as Cu, Zn, Ni and the like in soil is realized, and the effect of soil remediation is achieved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a method for remediating heavy metal contaminated soil comprises the following steps:
(1) taking heavy metal mixed contaminated soil, placing the heavy metal mixed contaminated soil in a high-temperature high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, heating and pressurizing to a supercritical state of carbon dioxide, wherein the ratio of the mass part of the soil to the volume part of the organic solvent is 1:6, and the organic solvent is ethanol; the critical temperature is 60 ℃, and the critical pressure is 29.4MPa
(2) The soil is leached for 20 minutes by spraying 2-thenoyltrifluoroacetone into the high-temperature high-pressure reaction kettle. The concentration of the sprayed 2-thenoyltrifluoroacetone is 0.005M.
Example 2:
a method for remediating heavy metal contaminated soil comprises the following steps:
(1) taking heavy metal mixed contaminated soil, placing the heavy metal mixed contaminated soil in a high-temperature high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, heating and pressurizing to a supercritical state of carbon dioxide, wherein the ratio of the mass part of the soil to the volume part of the organic solvent is 1:6, and the organic solvent is ethanol; the critical temperature is 70 ℃ and the critical pressure is 29.8MPa
(2) The soil is leached for 45 minutes by spraying 2-thenoyl trifluoroacetone into the high-temperature high-pressure reaction kettle. The concentration of the sprayed 2-thenoyltrifluoroacetone is 0.01M.
Example 3:
a method for remediating heavy metal contaminated soil comprises the following steps:
(1) taking heavy metal mixed contaminated soil, placing the heavy metal mixed contaminated soil in a high-temperature high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, heating and pressurizing to a supercritical state of carbon dioxide, wherein the ratio of the mass part of the soil to the volume part of the organic solvent is 1:6, and the organic solvent is ethanol; the critical temperature is 60 ℃, and the critical pressure is 29.5MPa
(2) The soil is leached for 30 minutes by spraying 2-thenoyl trifluoroacetone into the high-temperature high-pressure reaction kettle. The concentration of the sprayed 2-thenoyltrifluoroacetone is 0.005 MM.
Example 4:
a method for remediating heavy metal contaminated soil comprises the following steps:
(1) taking heavy metal mixed polluted soil, placing the heavy metal mixed polluted soil in a high-temperature high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, and heating and pressurizing to a supercritical state of carbon dioxide; the critical temperature is 65 ℃ and the critical pressure is 29.7 MPa.
(2) The soil is leached for 35 minutes by spraying 2-thenoyltrifluoroacetone into the high-temperature high-pressure reaction kettle. The concentration of the sprayed 2-thenoyltrifluoroacetone is 0.007M.
Example 5:
a method for remediating heavy metal contaminated soil comprises the following steps:
(1) selecting 500g of soil with the total heavy metal amount of Cu 874mg/kg, Zn 760mg/kg and Ni 552mg/kg, placing the heavy metal mixed polluted soil in a high-temperature high-pressure reaction kettle, adding 3000ml of ethanol into the soil, introducing carbon dioxide gas, and heating and pressurizing to a supercritical state of carbon dioxide; the critical temperature is 60 ℃, and the critical pressure is 29.5 MPa;
(2) the soil is leached for 30 minutes by spraying 2-thenoyl trifluoroacetone into the high-temperature high-pressure reaction kettle. The concentration of the sprayed 2-thenoyltrifluoroacetone is 0.005M. After the treatment is finished, the heavy metal content in the soil is detected, and the following conclusion is obtained: the Cu removal efficiency is 90.1%, the Zn removal efficiency is 76.4%, the Ni removal efficiency is 72%, and the solvent recovery rate is 83%.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A method for remediating heavy metal contaminated soil is characterized by comprising the following steps: the method comprises the following steps:
(1) taking heavy metal mixed polluted soil, placing the heavy metal mixed polluted soil in a high-temperature high-pressure reaction kettle, adding an organic solvent into the soil, introducing carbon dioxide gas, and heating and pressurizing to a supercritical state of carbon dioxide;
(2) and (3) spraying 2-thenoyltrifluoroacetone into the high-temperature high-pressure reaction kettle to drip wash the soil for a period of time.
2. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein: the ratio of the mass part of the soil to the volume part of the organic solvent in the step (1) is 1: 6.
3. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein: the heavy metal mixed polluted soil is sandy soil or acid soil with more free heavy metal ions.
4. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein: in the step (1), the critical temperature of the supercritical state is 60-70 ℃, and the critical pressure is 29.4-29.8 MPa.
5. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein: and (3) treating the soil in the step (2) in a high-temperature high-pressure reaction kettle for 20-45 minutes.
6. The method for remediating heavy metal contaminated soil as recited in claim 1, wherein: the concentration of the 2-thenoyltrifluoroacetone sprayed in the step (2) is 0.005M-0.01M.
Priority Applications (1)
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| CN201911159144.0A CN111036667A (en) | 2019-11-23 | 2019-11-23 | Method for repairing heavy metal contaminated soil |
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| CN201911159144.0A CN111036667A (en) | 2019-11-23 | 2019-11-23 | Method for repairing heavy metal contaminated soil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113102485A (en) * | 2021-03-24 | 2021-07-13 | 中国科学院工程热物理研究所 | Heavy metal contaminated soil remediation system and method based on supercritical fluid |
| CN114985440A (en) * | 2022-06-02 | 2022-09-02 | 中国人民解放军63653部队 | Method for supercritical plutonium extraction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113102485A (en) * | 2021-03-24 | 2021-07-13 | 中国科学院工程热物理研究所 | Heavy metal contaminated soil remediation system and method based on supercritical fluid |
| CN114985440A (en) * | 2022-06-02 | 2022-09-02 | 中国人民解放军63653部队 | Method for supercritical plutonium extraction |
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Application publication date: 20200421 |
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