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Stabilizer for repairing soil heavy metal pollution and application method thereof

A technology of pollution remediation and application methods, applied in the restoration, application, soil conditioning materials and other directions of polluted soil, can solve the problems of small effect of stabilizers, complex physical and chemical properties, ineffectiveness, etc., and achieves simple and easy application methods. The raw materials are cheap and easy to obtain, and the effect of secondary pollution is not easy

Active Publication Date: 2016-12-07
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. The addition of certain stabilizers leads to secondary pollution of the soil. For example, chelating agents will also take away the organic matter in the soil and other essential elements required by plants while adsorbing heavy metal ions in the soil, resulting in waste and destruction of the soil;
[0007] 2. A single agent can only repair a single heavy metal ion in the soil, and soil heavy metal pollution generally has multiple heavy metal pollutions coexisting, and the effect of a single agent is not satisfactory;
[0008] 3. Soil is a complex structure with extremely complex physical and chemical properties. Many polluting heavy metal ions are strongly adsorbed or chelated in the soil, resulting in little or no effect of common stabilizers

Method used

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  • Stabilizer for repairing soil heavy metal pollution and application method thereof
  • Stabilizer for repairing soil heavy metal pollution and application method thereof
  • Stabilizer for repairing soil heavy metal pollution and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The Pb and Cd contaminated soil in a certain place was selected as the sample for this implementation. The concentrations of Pb and Cd in the soil sample after sulfuric acid nitric acid leaching were 30.18mg / L and 4.77mg / L respectively.

[0043] It is prepared according to the following mass percentages: 45% of calcium dihydrogen phosphate, 5% of titanium dioxide, 8% of sodium chloride, and 22% of lightly burned powder.

[0044] The stabilizer and water were mixed at a mass ratio of 1:30, stirred, and made into a suspension. The stabilizer and soil samples were added at a mass ratio of 1:100, stirred evenly, and the stabilized soil was tested for leaching after 7 days of reaction. The leaching toxicity concentration is shown in the table below.

[0045]

Embodiment 2

[0047] The Pb and Cd contaminated soil in a certain place was selected as the sample implemented this time. The concentrations of Pb and Cd in the soil sample were 118.23mg / L and 3.84mg / L respectively after leaching with sulfuric acid and nitric acid.

[0048] It is prepared according to the following mass percentages: 50% of calcium dihydrogen phosphate, 5% of titanium dioxide, 10% of sodium chloride, and 20% of lightly burned powder.

[0049] The stabilizer and water were mixed at a mass ratio of 1:35, stirred, and made into a suspension. The stabilizer and soil samples were added at a mass ratio of 1:80, stirred evenly, and the stabilized soil was tested for leaching after 7 days of reaction. The leaching toxicity concentration is shown in the table below.

[0050]

Embodiment 3

[0052] The Pb and Cd contaminated soil in a certain place was selected as the sample for this implementation. The concentrations of Pb and Cd in the soil sample were 22.18mg / L and 6.46mg / L respectively after leaching with sulfuric acid and nitric acid.

[0053]It is prepared according to the following mass percentages: 48% of calcium dihydrogen phosphate, 4% of titanium dioxide, 8% of sodium chloride, and 25% of lightly burned powder.

[0054] The stabilizer and water were mixed at a mass ratio of 1:35, stirred, and made into a suspension. The stabilizer and soil samples were added at a mass ratio of 1:80, stirred evenly, and the stabilized soil was tested for leaching after 7 days of reaction. The leaching toxicity concentration is shown in the table below.

[0055]

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Abstract

The invention discloses a stabilizer for repairing soil heavy metal pollution and an application method thereof. After the stabilizer is used for carrying out stabilization treatment on heavy metal polluted soil, the leaching concentration of soil heavy metal ions is lower than a standard limited value of Identification Standard for Hazardous Wastes-Identification for Extraction Toxicity; the cost of raw materials of the stabilizer is relatively low and the stability of the treated soil heavy metal ions is high.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and in particular relates to a soil heavy metal pollution remediation stabilizer and an application method thereof. Background technique [0002] At present, soil heavy metal pollution in my country's environmental pollution has become a relatively prominent major social problem, posing a threat to my country's environmental safety and agricultural product safety. What's more serious is that soil heavy metal pollution has the characteristics of long-term and accumulation, which enters the food chain and threatens the safety of human life. Therefore, there is an urgent need to remediate the contaminated soil. [0003] Soil remediation is a technical measure to restore polluted soil to normal functions, specifically refers to the use of various methods to absorb, transfer, degrade and transform pollutants in the soil to reduce their concentration or transform them ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02B09C1/08
CPCB09C1/08B09C2101/00C09K17/02
Inventor 罗文连戴孙强贺治国蒋燚史卫华
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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