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Remediation method for treating heavy metal soil pollution

A soil pollution and remediation method technology, applied in the field of contaminated soil remediation, can solve the problems of complicated implementation, long remediation time, unfavorable popularization and application, etc., and achieves the effect of improving remediation effect, shortening remediation period, and good remediation effect.

Inactive Publication Date: 2020-06-05
刘俊龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have achieved certain results in practical applications, they are more or less costly in manpower and financial resources, complicated to implement, high in treatment costs, likely to cause a decrease in soil fertility, the removal of heavy metals is relatively simple, the repair time is long, and the repair effect is low. It is not good and is not conducive to large-scale promotion and application. Therefore, it is imperative to seek more effective remediation methods for heavy metal-contaminated soil.

Method used

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  • Remediation method for treating heavy metal soil pollution

Examples

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Effect test

Embodiment 1

[0029] A repair method for heavy metal soil pollution, comprising the following steps:

[0030] S1. Excavate and crush the soil polluted by heavy metals that needs to be repaired to obtain broken soil particles. The soil excavation depth is 20-30cm, and the animal and plant residues in the soil are removed, and the soil is passed through a nylon sieve. Fully mix evenly to form crushed soil particles with a particle size of 3-5mm;

[0031] S2. Lay a wheat straw repair layer with a thickness of 2-3cm at the bottom of the excavated soil. The wheat straw fragments are about 2-3cm long. Soak the wheat straw in 8% sodium hydroxide solution and keep the temperature at 50 Soak for 4 hours at ℃, add diphenylmethane diisocyanate and dissolve in acetone, the mass ratio of the mixture of diphenylmethane diisocyanate and acetone to wheat straw is 7:100, raise the temperature to 60℃ and stir for 2 hours to obtain wheat straw Repair layer, and then pave soil crushed soil particles on the wh...

Embodiment 2

[0042] A repair method for heavy metal soil pollution, comprising the following steps:

[0043] S1. Excavate and crush the soil polluted by heavy metals that needs to be repaired to obtain broken soil particles. The soil excavation depth is 30-40cm, and remove the animal and plant residues in the soil, and the soil is passed through a nylon sieve Fully mix evenly to form crushed soil particles with a particle size of 5-7mm;

[0044] S2. Lay a wheat straw repair layer with a thickness of 2-3cm at the bottom of the excavated soil. The wheat straw fragments are about 2-3cm long. Soak the wheat straw in a 10% sodium hydroxide solution and keep the temperature at 50 Soak for 4 hours at ℃, add diphenylmethane diisocyanate and dissolve in acetone, the mass ratio of the mixture of diphenylmethane diisocyanate and acetone to wheat straw is 10:100, raise the temperature to 60℃ and stir for 2 hours to obtain wheat straw Repair layer, and then pave soil crushed soil particles on the whea...

Embodiment 3

[0055] A repair method for heavy metal soil pollution, comprising the following steps:

[0056] S1. Excavate and crush the soil polluted by heavy metals that needs to be repaired to obtain broken soil particles. The soil excavation depth is 40-50cm, and the animal and plant residues in the soil are removed, and the soil is passed through a nylon sieve. Fully mix evenly to form crushed soil particles with a particle size of 6-8mm;

[0057] S2. Lay a wheat straw repair layer with a thickness of 4-5cm at the bottom of the excavated soil. The wheat straw fragments are about 2-3cm long. Soak the wheat straw in a 10% sodium hydroxide solution and keep the temperature at 50 Soak for 4 hours at ℃, add diphenylmethane diisocyanate and dissolve in acetone, the mass ratio of the mixture of diphenylmethane diisocyanate and acetone to wheat straw is 15:100, raise the temperature to 60℃ and stir for 2 hours to obtain wheat straw Repair layer, and then pave soil crushed soil particles on th...

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Abstract

The invention discloses a remediation method for treating heavy metal contaminated soil, and relates to the technical field of contaminated soil remediation. The remediation method comprises the following steps: S1, excavating and crushing heavy metal polluted soil to be remediated to obtain crushed soil particles of the soil; S2, paving a wheat straw restoration layer with the thickness of 2-3 cmat the bottom of the excavated soil, then laying the crushed soil particles of the soil on the wheat straw restoration layer, with the laying thickness being 20 cm; S3, adding a soil remediation agent to the laid heavy metal polluted soil, and after addition is completed, subjecting the heavy metal polluted soil to up-down ploughing operation. The remediation method combines multiple remediationmethods such as chemical remediation, physical remediation, microbial remediation and phytoremediation for remediation of the heavy metal polluted soil, the remediation effect of the heavy metal polluted soil is greatly improved, the remediation period of a single remediation method is shortened, and the disclosed remediation method is suitable for remediation of large-area heavy metal polluted soil.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a remediation method for treating heavy metal soil pollution. Background technique [0002] Soil heavy metal pollution is soil pollution caused by excessive deposition of heavy metals in the soil. Heavy metals in polluted soil mainly include mercury, cadmium, lead, chromium and metalloid arsenic and other elements with significant biological toxicity, as well as elements with certain toxicity such as zinc, copper and nickel. Mainly from mining waste residues, pesticides, wastewater, sludge and atmospheric deposition, etc. For example, mercury mainly comes from mercury-containing wastewater, cadmium and lead pollution mainly comes from smelting emissions and vehicle exhaust deposition, and arsenic is widely used as insecticides, fungicides, Rodenticides and herbicides. Excessive heavy metals can cause plant physiological dysfunction and nutritional imbalanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10B09C1/00
CPCB09C1/00B09C1/08B09C1/10B09C1/105
Inventor 刘俊龙刘肖俊
Owner 刘俊龙
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