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Method for remediating heavy metal contaminated soil by cyclodextrin reinforced modifier

A technology of polluted soil and cyclodextrin, which is applied in the field of soil remediation, can solve the problems that the basic physical and chemical properties of the remediation soil cannot be effectively improved, the growth of green vegetation is unfavorable, and the passivation effect is slightly poor, so as to improve the remediation efficiency and avoid secondary pollution , Improve the effect of passivation

Pending Publication Date: 2020-11-06
中盾三润(山东)环境科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single inorganic amendment can significantly passivate the heavy metals in the soil, but it cannot effectively improve the basic physical and chemical properties of the soil, which is not conducive to the growth of green vegetation in the later stage; a single organic amendment, the passivation effect is slightly worse, but it can significantly improve soil fertility. good for plant growth

Method used

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  • Method for remediating heavy metal contaminated soil by cyclodextrin reinforced modifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 A method for repairing heavy metal-contaminated soil with a cyclodextrin-enhanced amendment

[0026] (1) Add cyclodextrin-enhanced improver to 450g of polluted soil. The ratio of cyclodextrin-enhanced improver to soil weight is 1:9. After mixing evenly, water regularly to keep the soil moist; the cyclodextrin The strengthening improver is composed of β-cyclodextrin, rice husk, biochar, calcium magnesium phosphate fertilizer, and organic fertilizer in a weight ratio of 0.1:0.9:1:1:2;

[0027] (2) Set a passivation period of 4 months, and regularly measure the content of DTPA extractable heavy metals in the soil within 120 days of passivation restoration.

Embodiment 2

[0028] Example 2 A method for repairing heavy metal-contaminated soil with a cyclodextrin-enhanced amendment

[0029] (1) Add a cyclodextrin-enhanced improver to 450g of contaminated soil, the ratio of the added amount of the cyclodextrin-enhanced improver to the weight of the soil is 1:8, mix well and water regularly to keep the soil moist; the cyclodextrin The strengthening improver is composed of α-cyclodextrin, rice husk, biochar, calcium magnesium phosphate fertilizer, and organic fertilizer in a weight ratio of 0.08:1:0.8:1.2:2;

[0030] (2) Set a passivation period of 4 months, and regularly measure the content of DTPA extractable heavy metals in the soil within 120 days of passivation restoration.

Embodiment 3

[0031] Example 3 A method for repairing heavy metal-contaminated soil with a cyclodextrin-enhanced amendment

[0032] (1) Add cyclodextrin strengthening improver to 450g of polluted soil, the ratio of cyclodextrin strengthening improver to soil weight is 1:10, after mixing evenly, water regularly to keep the soil moist; The strengthening improver is composed of γ-cyclodextrin, rice husk, biochar, calcium magnesium phosphate fertilizer, and organic fertilizer in a weight ratio of 0.12:0.8:1.2:0.8:2;

[0033] (2) Set a passivation period of 4 months, and regularly measure the content of DTPA extractable heavy metals in the soil within 120 days of passivation restoration.

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Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a method for remediating heavy metal contaminated soil by a cyclodextrin reinforced modifier. The method comprises the following steps of: (1) adding the cyclodextrin reinforced modifier into the contaminated soil according to a weight ratio of 1:(8-10), uniformly mixing the substances, and regularly performing watering to keep the soil moist; and (2) setting a passivation period of 2-4 months, and periodically determining the content of DTPA extractable heavy metals in the soil within 120 days of passivation remediation. The efficient adsorption and enrichment effects of cyclodextrin on heavy metals are fully utilized, the passivation effect on the heavy metals in the contaminated soil is enhanced, and the remediation efficiency of the heavy metal contaminated soil is improved.

Description

technical field [0001] The invention relates to a method for repairing heavy metal-contaminated soil with a cyclodextrin-enhanced modifier, and belongs to the technical field of soil repair. Background technique [0002] With the rapid development of industrialization and urbanization, soil heavy metal pollution has become one of the environmental pollution problems that our country is currently facing. The mining of metal mines, large-scale industrial production and the discharge of solid waste are the main ways that lead to soil heavy metal pollution. Soil heavy metal pollution not only poses a serious threat to soil quality, but also directly or indirectly affects the health of the people, which is not conducive to social stability and sustainable development. Among the many remediation methods of heavy metal pollution in soil, the passivation remediation of amendments has the advantages of low price, simple application and remarkable effect, and has been widely used in ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 倪寿清崔兆杰孙晓梅
Owner 中盾三润(山东)环境科技有限公司
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