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In-situ remediation method for heavy metal contaminated soil and application thereof

An in-situ restoration and contaminated soil technology, applied in the restoration of contaminated soil, etc., can solve the problems of inappropriate restoration of large-scale contaminated soil, loss of soil biological function, and impact on soil biological activity, etc., to achieve strong engineering applicability , prevent secondary pollution, and have obvious ecological benefits

Inactive Publication Date: 2018-11-02
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally used physical and chemical remediation techniques such as guest soil, leaching, and pyrolysis treatment have certain limitations when remediating contaminated soil. For example, it is not suitable for remediating large-scale contaminated soil. In addition, these methods may affect the activity of soil organisms. Even change the soil structure, resulting in the loss of soil biological function

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  • In-situ remediation method for heavy metal contaminated soil and application thereof
  • In-situ remediation method for heavy metal contaminated soil and application thereof
  • In-situ remediation method for heavy metal contaminated soil and application thereof

Examples

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Embodiment 1

[0054] This example provides an in-situ remediation method for mercury-contaminated soil, the remediation land area is 10m×10m, and the remediation process is as follows figure 1 shown, including the following steps:

[0055] 1) Site leveling: do all kinds of preparatory work, such as clearing all ground and underground obstacles in the site, removing ground water, paving temporary roads, etc.

[0056] 2) In-situ solidification: Sprinkle coal fly ash on the surface of the mercury-contaminated soil to solidify the soil, and then lay 30-35cm thick clay on the surface of the solidified soil as an anti-seepage layer.

[0057] 3) Lay the planting soil layer, and backfill the planting soil on the surface of the working surface after anti-seepage treatment. The thickness of the planting soil layer is 40-45cm, and the physical and chemical indicators of the planting soil meet the requirements of "Green Planting Soil" (CJ / T340-2016). The schematic diagram of the soil structure is as ...

Embodiment 2

[0061] This embodiment provides an in-situ repair method for mercury-contaminated soil. The repaired land area is 10m×10m, including the following steps:

[0062] 1) Site leveling: do all kinds of preparatory work, such as clearing all ground and underground obstacles in the site, removing ground water, paving temporary roads, etc.

[0063] 2) In-situ solidification: Sprinkle lime on the surface of the mercury-contaminated soil to solidify the soil, and then lay 40-45cm thick clay on the surface of the solidified soil as an anti-seepage layer.

[0064] 3) Lay the planting soil layer, and backfill the planting soil on the surface of the working surface after anti-seepage treatment. The thickness of the planting soil layer is 30-35cm, and the physical and chemical indicators of the planting soil meet the requirements of "Green Planting Soil" (CJ / T340-2016).

[0065] 4) Vegetation planting: plant shrubs and herbaceous plants, plant Junexue and raspberry for shrubs, the planting r...

Embodiment 3

[0067] This embodiment provides an in-situ repair method for mercury-contaminated soil. The repaired land area is 10m×10m, including the following steps:

[0068] 1) Site leveling: do all kinds of preparatory work, such as clearing all ground and underground obstacles in the site, removing ground water, paving temporary roads, etc.

[0069] 2) In-situ solidification: spread bentonite on the surface of the mercury-contaminated soil to solidify the soil, and then lay 20-25cm thick clay on the surface of the solidified soil as an anti-seepage layer.

[0070] 3) Lay the planting soil layer, and backfill the planting soil on the surface of the working surface after anti-seepage treatment. The thickness of the planting soil layer is 45-50cm, and the physical and chemical indicators of the planting soil meet the requirements of "Green Planting Soil" (CJ / T340-2016).

[0071] 4) Vegetation planting: plant shrubs and herbaceous plants, the shrubs are planted with June Snow, and the plan...

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Abstract

The invention provides an in-situ remediation method for heavy metal contaminated soil and application thereof, and relates to the technical field of contaminated soil prevention and treatment. The in-situ remediation method comprises the steps that an anti-seepage layer is laid on the contaminated soil after solidification treatment, then a planting soil layer is laid on the anti-seepage layer, and vegetations are planted on the planting soil layer to achieve the purpose of remediation of the soil contaminated with heavy metals. The in-situ remediation method has the advantages of safety, cleanness, high environmental benefits and obvious ecological benefits, and the advantages of low cost and convenient construction are achieved by applying the in-situ remediation method to industrial pollution site repair.

Description

technical field [0001] The invention relates to the technical field of contaminated soil prevention and control, in particular to an in-situ restoration method for heavy metal-contaminated soil and its application. Background technique [0002] Soil is an important part of the environment on which human beings live. Pollutants in the soil will be absorbed by the soil and enter the interior of the soil, especially heavy metal pollutants that cannot be degraded and will be enriched in the soil. Compared with water pollution and air pollution, soil pollution has the characteristics of long pollution time, irreversibility and refractory degradation. Sources of soil pollution generally include sewage irrigation, solid waste, and pollution from pesticides and fertilizers. At present, soil pollution in some areas of our country presents a very serious situation, which poses a serious threat to the ecological environment, food safety and agricultural development. More than 12 milli...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08B09C2101/00
Inventor 吕正勇方英苗竹魏丽李淑彩冯国杰朱湖地宋登慧范吉强
Owner BEIJING GEOENVIRON ENG & TECH
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