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Greening planting soil prepared from heavy metal polluted soil and preparation method of greening planting soil

A technology of heavy metal polluted soil and greening planting soil, applied in the restoration of polluted soil and other directions, can solve problems such as land resource pressure and lack of comprehensive research on secondary utilization, and achieve the effect of reducing construction cost and meeting the requirements of sustainable development.

Inactive Publication Date: 2015-12-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, there is still a lack of comprehensive research on the secondary utilization of contaminated soil after restoration, resulting in a large amount of restored contaminated soil that can only be reprocessed through landfill, causing huge pressure on land resources
At present, there is still a lack of remediation methods on the market that allow heavy metal contaminated soil to be safely used as greening planting soil after remediation. Therefore, a reagent that is environmentally friendly, simple in steps, and strong in biosafety is needed for remediation of contaminated soil as a greening plant. The Restoration Method of Using Soil to Reuse Resources

Method used

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  • Greening planting soil prepared from heavy metal polluted soil and preparation method of greening planting soil
  • Greening planting soil prepared from heavy metal polluted soil and preparation method of greening planting soil
  • Greening planting soil prepared from heavy metal polluted soil and preparation method of greening planting soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a repair reagent for heavy metal contaminated soil. The repair reagent includes the following components in parts by mass:

[0025] Potassium dihydrogen phosphate: 45-50 parts;

[0026] Superphosphate: 45-50 parts;

[0027] Magnesium oxide: 0-10 parts.

[0028] In this embodiment, the contaminated soil contains lead, zinc, and chromium metal elements, and the lead, zinc, and chromium metal elements account for more than 90% of the mass of the contaminated metal elements in the contaminated soil. In other words, the heavy metal elements in contaminated soil mainly contain lead, zinc, and chromium.

[0029] The repairing process of the contaminated soil by the repairing agent of this embodiment is: superphosphate, potassium dihydrogen phosphate and heavy metal pollutants are fixed by ion exchange and reaction to generate insoluble salts. Magnesium oxide reacts with heavy metal contaminants to form hydroxide precipitates to fix it. Specifically, superphos...

example 1

[0058] Example 1—Example 5 The electrical conductivity EC value of the heavy metal contaminated soil after restoration is about 2.0, and the salinity is close to the standard requirements of green planting soil, while the EC value of the heavy metal contaminated soil after the restoration in Comparative Example 2 is close to 6.0, which is too strong. , Not suitable for use as planting soil.

[0059] For nutrient elements, since the added remediation reagent contains K ions and phosphate, the soil fertility indexes (alkali-hydrolyzed nitrogen, available potassium, soluble phosphorus) are better than those of Comparative Example 2 after remediation Of soil.

Embodiment 2

[0061] Example 2 is an application of the repair reagent of Example 1. Embodiment 2 provides a green planting soil, which includes heavy metal contaminated soil, repair reagents, and organic planting soil.

[0062] Heavy metal contaminated soil contains lead, zinc, and chromium metal elements, and lead, zinc, and chromium metal elements account for more than 90% of the contaminated metal elements in the contaminated soil. Organic planting soil is planting soil that can be purchased in the market. For example: Organic soil produced by Huaian Huainong Agricultural Technology Development Co., Ltd.

[0063] As a preferred solution, the repair reagent includes the following components in parts by mass:

[0064] Potassium dihydrogen phosphate: 45-50 parts;

[0065] Superphosphate: 45-50 parts;

[0066] Magnesium oxide: 0-10 parts.

[0067] As a preferred solution, the mass ratio of the heavy metal contaminated soil, the remediation reagent and the organic planting soil is 1:0.01 to 0.03:1. ...

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Abstract

The invention discloses greening planting soil prepared from heavy metal polluted soil. The greening planting soil comprises the heave metal polluted soil, repairing reagents and organic matter planting soil. After the heavy metal polluted soil is repaired through the repairing reagents, the polluted soil can be prepared into the greening planting soil to be used, and the greening planting soil is high in environment safety. The invention further provides a preparation method of the greening planting soil. The preparation method comprises the following steps that the heavy metal polluted soil is repaired through the repairing reagents; then maintenance is conducted; and finally the maintained heavy metal polluted soil and the organic matter planting soil are mixed and stirred, and in this way the greening planting soil is prepared.

Description

Technical field [0001] The invention relates to a greening planting soil and a preparation method, in particular to a greening planting soil made from heavy metal contaminated soil and a preparation method thereof. Background technique [0002] With the improvement of site environmental requirements, the importance of remediation of contaminated soil has become increasingly significant. At this stage, there is still a lack of comprehensive research on the secondary utilization of contaminated soil after restoration. As a result, a large amount of contaminated soil after restoration can only be reprocessed through landfills, which puts huge pressure on land resources. At present, there is still a lack of remediation methods on the market that can safely use heavy metal contaminated soil as green planting soil for secondary use after remediation. Therefore, a reagent is needed for environmental protection, simple steps, and strong biological safety. The restoration method of using...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 于博伟杜延军魏明俐
Owner SOUTHEAST UNIV
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