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Method for in-situ remediation of heavy metal contaminated soil

A technology for polluted soil and in-situ remediation, applied in the field of soil remediation, can solve the problems of unstable effect of curing agent, secondary pollution of curing agent, narrow application area, etc., and achieves the effect of low cost, good remediation effect, and reduced absorption

Inactive Publication Date: 2018-02-02
DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main curing agents include cement, lime, fly ash, etc., which have narrow application areas and high cost, and some curing agents themselves have secondary pollution, such as fly ash, and the long-term curing effect of the curing agent is unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for in situ remediation of heavy metal-contaminated soil in this embodiment comprises the following steps:

[0023] (1) Dilute the modifier with water, the mass ratio of modifier to water is: modifier: water = 1:40;

[0024] (2) Spray the diluted amendment at 200L / mu on the heavy metal-contaminated soil, mix it with the soil, apply it every other month, and apply it continuously for 3 months;

[0025] (3) By weight percentage: 20% montmorillonite powder, 60% attapulgite powder, and 20% raw iron powder are mixed evenly to make curing agent particles with a particle size of 3mm~4mm, and the curing agent particles are mixed with complexing agent citric acid Homogeneously, a mixture is obtained;

[0026] (4) Sow the mixture of curing agent particles and citric acid into the soil repaired by the amendment by mechanical tillage. Wherein, the addition ratio of citric acid is 0.01% of the solidifying agent particle weight, and the volume of the mechanical tillage mix...

Embodiment 2

[0030] A method for in situ remediation of heavy metal-contaminated soil in this embodiment comprises the following steps:

[0031] (1) Dilute the modifier with water, the mass ratio of modifier to water is: modifier: water = 1:40;

[0032] (2) Spray the diluted amendment at 240L / mu on the heavy metal-contaminated soil, mix it with the soil, and apply it every other month for 4 consecutive months;

[0033] (3) By weight percentage: 25% montmorillonite powder, 50% attapulgite powder, and 25% raw iron powder are mixed evenly to make curing agent particles with a particle size of 3mm~4mm, and the curing agent particles are mixed with complexing agent citric acid Homogeneously, a mixture is obtained;

[0034] (4) Sow the mixture of curing agent particles and citric acid into the soil repaired by the amendment by mechanical tillage. Wherein, the addition ratio of citric acid is 0.015% of the solidifying agent particle weight, and the volume of the mechanical tillage mixture is 12...

Embodiment 3

[0038] A method for in situ remediation of heavy metal-contaminated soil in this embodiment comprises the following steps:

[0039] (1) Dilute the modifier with water, the mass ratio of modifier to water is: modifier: water = 1:40;

[0040] (2) Spray the diluted amendment at 280L / mu on the heavy metal-contaminated soil, mix it with the soil, apply it every other month, and apply it continuously for 5 months;

[0041] (3) By weight percentage: 30% of montmorillonite powder, 40% of attapulgite powder, and 30% of original iron powder are mixed evenly to make curing agent particles with a particle size of 3mm~4mm, and the curing agent particles are mixed with complexing agent citric acid Homogeneously, a mixture is obtained;

[0042] (4) Sow the mixture of curing agent particles and citric acid into the soil repaired by the amendment by mechanical tillage. Wherein, the addition ratio of citric acid is 0.02% of the solidifying agent particle weight, and the volume of the mechanic...

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PUM

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Abstract

The invention provides a method for in-situ remediation of heavy metal contaminated soil. The method comprises the following steps that a modifying agent is diluted by adding water; the diluted modifying agent is sprayed on the heavy metal contaminated soil to be mixed with the soil; curing agent particles and complexing agent citric acid are uniformly mixed to obtain a mixture; through a tractor-ploughing method, the mixture is seeded into the soil remediated through the modifying agent; and through a weighing method, the water content of the soil is kept through watering. According to the method for in-situ remediation of the heavy metal contaminated soil in a modifying agent and curing agent combined mode, operation is easy, the cost is low, the remediation effect is good, the soil aggregated structure can be effectively improved, and soil fertility can be effectively improved; and the method is suitable for treating of large-area contaminated soil, various heavy metal inside the soil can be removed, particularly, the removing effect on Pb, Zn, Cu and Cd is good, the heavy metal inside the soil is prevented from migrating into plants, absorption of the plants for the heavy metalis reduced, and secondary contamination cannot occur.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for in-situ remediation of heavy metal polluted soil. Background technique [0002] In the mining of mineral resources, especially in the process of mining of metal mineral resources, heavy metal elements in waste rock tailings, smelting wastewater, and waste gas floating dust are the main pollution sources of the mining area environment. The heavy metal content in the surrounding soil increases through polluted irrigation and atmospheric dust. , thus polluting soil, surface water, and groundwater. [0003] Soil improvement measures are to add one or more substances to the soil, improve the adsorption capacity of heavy metals in the soil by changing the physical and chemical properties of the soil, or directly interact with heavy metals to form complexes or precipitates with low solubility, thereby reducing the concentration of heavy metals in the soil. Migrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/00B09C1/08B09C2101/00
Inventor 马跃李伟高树龙路畅孙成亮
Owner DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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