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Cyanide contaminated soil restoring method

A technology of polluted soil and remediation method, which is applied in the field of environmental protection and comprehensive management. It can solve the problems of long plant remediation period, impact on plant growth, and high cost, and achieve the effect of improving ozone utilization efficiency, improving treatment effect, and stabilizing effect

Inactive Publication Date: 2015-09-23
CHANGCHUN GOLD RES INST
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AI Technical Summary

Problems solved by technology

However, the curing-stabilization method can only be applied to lightly polluted soil remediation. For heavily polluted soil, the curing-stabilization method has poor curing effect, high cost, and will cause secondary pollution
[0004] Electric repair technology is based on the electrokinetics of ions and the principle of electrodialysis, using direct current to treat the soil. The disadvantage of this technology is that there is an acidic area, and cyanide is easy to produce hydrocyanic acid volatilization under acidic conditions, which is more harmful. , and less research on cyanide remediation
[0005] Phytoremediation technology has the advantages of adapting measures to local conditions and avoiding soil disturbance, but the phytoremediation cycle is too long, cyanide is a highly toxic chemical substance, and heavily polluted soil has a serious impact on plant growth

Method used

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  • Cyanide contaminated soil restoring method
  • Cyanide contaminated soil restoring method
  • Cyanide contaminated soil restoring method

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specific Embodiment 1

[0040] The soil polluted by cyanide is collected as the soil to be treated, and impurities such as plant roots and gravel are removed, sieved, mixed, and sampled. After analysis, the cyanide content of the soil was over 608mg / kg, and the thiocyanate content was 144mg / kg. Carry out toxicity identification to it, its main pollutant is cyanide, heavy metal, and the composition of main pollutant is as follows:

[0041] Table 1 Identification results of leaching toxicity of cyanide-contaminated soil

[0042]

[0043] Note: pH is dimensionless.

[0044] According to the relevant limit value regulations in the "Identification of Hazardous Waste Identification Standards for Leaching Toxicity" (GB 50853-2007), the concentration of cyanide is seriously higher than 5mg / L, so the soil has the characteristics of leaching toxicity. Preferably, take 1 kg of soil and 1 kg of water, and prepare mud liquid ① according to the soil-water mass ratio of 1:1, stir for 10 minutes, and filter the...

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Abstract

The invention discloses a cyanide contaminated soil restoring method. The method is used for processing heavily-contaminated soil with cyanide as the specific pollutant, and meanwhile the contaminated soil contains copper and other heavy metal. In the method, the heavy metal cyano complex, thiocyanate and other reducing substances in the soil are broken through the oxidizability of ozone and hydrogen peroxide. The pH value of the soil can be restored through a pH value restoring agent, finally restoration is conducted through the hydrogen peroxide, and a reaction system tends to be stable while the pollutant is processed; through the restoration of the method, a good restoration effect is achieved for copper and other heavy metal. The soil reaches the B-level standard in Standard of Soil Quality Assessment for Exhibition Sites after being restored and can be used as a class-II soil resource. The method is good in restoration effect of the cyanide heavily-contaminated soil, adopts environment-friendly agents so that no secondary pollution can be caused to the soil, is low in restoration cost, short in restoration cycle and suitable for application and popularization, and has certain environment benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and comprehensive treatment, relates to soil remediation technology, mainly aims at cyanide-contaminated soil, and relates to a method for remediating cyanide-contaminated soil. Background technique [0002] In the process of our country's rapid industrialization, the environment we depend on has been seriously damaged, the problem of soil environmental pollution is becoming more and more serious, and soil pollution accidents emerge in endlessly. The more common types of pollutants are cyanide and heavy metals. Other industrial areas that use cyanide, such as gold mines and electroplating, have large areas of polluted sites, and the pollution is serious. And the soil polluted by cyanide becomes a secondary pollution source in the environment. At present, the technologies for soil remediation mainly include solidification-stabilization method, phytoremediation technology and elect...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 李哲浩杨飞莹刘强王莹
Owner CHANGCHUN GOLD RES INST
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