Repairation method of chromium-polluted soil and corresponding equipment thereof

A technology of chromium-contaminated soil and restoration method, applied in the direction of restoration of polluted soil, etc., can solve problems such as unfavorable plant growth, rebound, unsuitable lime, etc.

Inactive Publication Date: 2013-05-08
韩清洁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used curing agents are cement and lime, but the soil treated with cement is not conducive to the growth of plants, and lime is not suitable for the restoration of alkaline soil, and the dissolution of hexavalent chromium in the soil after cement and lime treatment will change with time. rebound

Method used

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  • Repairation method of chromium-polluted soil and corresponding equipment thereof
  • Repairation method of chromium-polluted soil and corresponding equipment thereof
  • Repairation method of chromium-polluted soil and corresponding equipment thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] Embodiment one: the remediation method of this chromium-contaminated soil comprises the following steps,

[0037] 1) Crushing and screening:

[0038] The chromium-contaminated soil is crushed and screened, so that more than 90% of the chromium-contaminated soil particles have a diameter of ≤20mm; the pre-treatment of the chromium-contaminated soil to be repaired lays the foundation for the reduction and solidification reactions in the subsequent treatment procedures.

[0039] 2) Adjust pH:

[0040] Adding sulfuric acid to the chromium-contaminated soil treated in step 1) until the pH of the chromium-contaminated soil is 5;

[0041] An acidic environment is provided to facilitate the reduction reaction.

[0042] 3) Reduction reaction:

[0043] Add reducing agent to the chromium-contaminated soil after step 2) treatment, and add enough water to ensure that the soil moisture content is higher than 40%, and stir evenly, let stand for more than 20h; Make reducing agent an...

Embodiment approach 2

[0052] Embodiment two: the step 2) adjusts the pH, adding sulfuric acid until the pH of the chromium-contaminated soil is 6, the mass ratio of the manganese slag solidifying agent to the chromium-contaminated soil is 1:10, and the ferrous sulfate addition is equal to the chromium-contaminated soil. The mass ratio of polluted soil is 1:20; the rest of the method description and equipment structure are as described in the first embodiment. slightly.

Embodiment approach 3

[0053]Embodiment three: the step 2) adjusts the pH, adding sulfuric acid until the pH of the chromium-contaminated soil is 6, the mass ratio of the manganese slag solidifying agent to the chromium-contaminated soil is 1:100, and the ferrous sulfate addition is equal to the chromium-contaminated soil. The mass ratio of polluted soil is 1:100; the rest of the method description and equipment structure are as described in the first embodiment. slightly.

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Abstract

The invention relates to a repairation method of chromium-polluted soil and corresponding equipment of the repairation method. After a traditional repairation method of chromium-polluted soil is used for treating the soil, the dissolving of hexavalent chromium in the soil after treatment rebounds along with time. The repairation method of chromium-polluted soil takes manganese slag as a curing agent, and comprises the following steps of: crushing and screening: crushing and screening the chromium-polluted soil, so that the particle diameter of more than 90% of chromium-polluted soil is less than or equal to 20mm; regulating the pH value: adding sulfuric acid in the chromium-polluted soil after treatment in step (1) until the pH value of the chromium-polluted soil is 5-6; carrying out reduction reaction: adding a reducing agent in chromium-polluted soil after treatment in step (2), adding sufficient water so as to guarantee that the soil water content is higher than 40%, stirring uniformly, and standing for more than 20 hours; and carrying out curing reaction: adding a manganese slag curing agent in the soil obtained in step (3), and stirring uniformly, thereby obtaining the repaired soil. The repairation method of chromium-polluted soil and the corresponding equipment provided by the invention have the beneficial effects that the chromium-polluted soil is treated thoroughly and does not rebound, certain practical significance is brought to ecological environment protection, the equipment can operate continuously and automatically and the like.

Description

technical field [0001] The invention relates to a method for repairing chromium-contaminated soil and corresponding equipment. Background technique [0002] With the in-depth treatment of chromium slag, the restoration of the chromium-contaminated soil at the bottom of the chromium slag field and nearby is also on the agenda. Chromium slag is a solid waste containing hexavalent chromium discharged from the production process of chromium salt, which is a hazardous waste containing heavy metal pollution. The toxicity of chromium mainly comes from hexavalent chromium, which is one of the three internationally recognized carcinogenic metals and is extremely harmful to the human body. Because hexavalent chromium has a strong ability to migrate, it has caused serious pollution to the soil, and the disposal or restoration of chromium-contaminated soil is a major issue in environmental protection. [0003] Stabilization and solidification is a common method for remediation of chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
Inventor 韩清洁
Owner 韩清洁
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