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In-situ remediation method for cyanide-containing contaminated soil and underground water

A technology for in-situ restoration of polluted soil, applied in the field of contaminated soil restoration, can solve the problems of inability to cultivate and lose the effect of soil, and achieve low cost, good social and ecological benefits, and simple process flow

Inactive Publication Date: 2017-05-31
云南大地绿坤环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the use of alkali chlorine method to treat cyanide-containing waste residue, the method of first stabilization treatment and then solidification treatment is often used. The role of soil lost in the solidified body after treatment cannot be cultivated.

Method used

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  • In-situ remediation method for cyanide-containing contaminated soil and underground water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Taking the cyanide-contaminated soil and groundwater of a chemical plant as the treatment object: pH=8.1, moisture content 47.9%, total cyanide 990mg / kg, cyanide leaching concentration 108mg / L; the groundwater pH=7.1, cyanide concentration 97.2mg / L;

[0030] Utilize method of the present invention to process this cyanide-containing polluted soil and groundwater:

[0031] Under normal temperature conditions, take 10kg of cyanide-contaminated soil and place it in a 20cmX20cmX40cm reactor, and add an appropriate amount of corresponding groundwater to simulate the actual situation, and set a 30 Ο According to the pH value and cyanide content of cyanide-contaminated soil and groundwater, add an appropriate amount of lime and bleaching powder mixture to the perfusion hole, and regularly carry out precipitation or oxidant leaching on the surface, and maintain for 60 days;

[0032] Performance test: According to the National Environmental Protection Standard of the People's Re...

Embodiment 2

[0034] Taking the cyanide-contaminated soil and groundwater of a chemical plant as the treatment object: pH=6.1, moisture content 38.6%, total cyanide 338mg / kg, cyanide leaching concentration 31.2mg / L; the groundwater pH=6.0, cyanide The concentration is 20.2mg / L;

[0035] Utilize method of the present invention to process this cyanide-containing polluted soil and groundwater:

[0036] Under normal temperature conditions, take 10kg of cyanide-contaminated soil and place it in a 20cmX20cmX40cm reactor, and add an appropriate amount of corresponding groundwater to simulate the actual situation, and set a 35 Ο According to the pH value and cyanide content of the cyanide-contaminated soil and groundwater, add an appropriate amount of lime and bleaching powder mixture to the perfusion hole, and regularly carry out precipitation or oxidant leaching on the surface, and maintain for 45 days;

[0037] Performance test: According to the National Environmental Protection Standard of the...

Embodiment 3

[0039] Taking the cyanide-contaminated soil and groundwater of a chemical plant as the treatment object: pH=6.9, moisture content 55.2%, total cyanide 183mg / kg, cyanide leaching concentration 18.1mg / L; the groundwater pH=6.8, cyanide The concentration is 10.3mg / L;

[0040] Utilize method of the present invention to process this cyanide-containing polluted soil and groundwater:

[0041] Under normal temperature conditions, take 10kg of cyanide-contaminated soil and place it in a 20cmX20cmX40cm reactor, and add an appropriate amount of corresponding groundwater to simulate the actual situation, and set a 45 Ο According to the pH value and cyanide content of cyanide-contaminated soil and groundwater, add an appropriate amount of lime and bleaching powder mixture to the perfusion hole, and regularly carry out precipitation or oxidant leaching on the surface, and maintain for 32 days;

[0042] Performance test: According to the National Environmental Protection Standard of the Peo...

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Abstract

The invention discloses an in-situ remediation method for cyanide-containing contaminated soil and underground water. The method includes the following steps that lime and bleaching powder or sodium hypochlorite is used as a permeable reactive barrier medium under the indoor temperature condition; and according to the cyanide content in the soil and underground water and the thickness of the cyanide-containing contaminated soil, a continuous channel is adopted for conducting in-situ remediation on the cyanide-containing contaminated soil and underground water. The in-situ remediation method for the cyanide-containing contaminated soil and underground water has the advantages that the technological process is simple, implementation is easy, the applied range is wide, cost is low and efficiency is high; and remediation of the cyanide-containing contaminated soil and underground water can achieve good social benefits and ecological benefits.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, in particular to a method for in-situ remediation of cyanide-containing contaminated soil and groundwater. Background technique [0002] Cyanides are highly toxic substances. Common inorganic cyanides include hydrocyanic acid, potassium cyanide, sodium cyanide, etc. Organic cyanides are formed by combining a cyano group with another carbon atom through a single bond, which can be nitrile (C -CN) and isonitrile (C-NC), common dimethylethanedinitrile, acetonitrile, etc. [0003] Cyanide has daunting toxicity, the lethal dose of oral hydrocyanic acid is 0.7-3.5mg / kg; the concentration of hydrocyanic acid in the inhaled air can be fatal if the concentration of hydrogen cyanide reaches 0.5mg / L; the fatal dose of oral sodium cyanide and potassium cyanide The amount is 1-2 mg / kg. Cyanide exists widely in nature. In plants, taking 40-60 capsules of bitter almonds for adults and 10...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08B09C1/00
CPCB09C1/02B09C1/002B09C1/08B09C2101/00
Inventor 陈小凤吕本儒吴启模吴见珣郭小伟李金勇和学友
Owner 云南大地绿坤环保科技有限公司
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