Chemical repair method for cyanide polluted soil

A technology for chemical remediation and contaminated soil, applied in the field of chemical remediation of cyanide-contaminated soil, to achieve the effects of high utilization rate, good remediation effect and low cost

Active Publication Date: 2009-04-29
SUN YAT SEN UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a soil chemical remediation method for cyanide pollution aiming at the deficiencies in the existing soil cyanide pollution control technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1 Soil remediation

[0012] Collect contaminated soil from an abandoned electroplating factory in Aotou Town, Conghua City. The sampling depth is 0-30cm. Mix the collected soil samples evenly, dry them in the dark, remove impurities, crush them, divide them into two parts by quartering, and grind one part to the whole. Through a 60-mesh sieve, it is used for the analysis of soil organic matter, soil total nitrogen and other items. The determination of cyanide content is to use fresh soil samples collected, and the determination method refers to the soil environmental quality evaluation standard for exhibition land (provisional). The measurement results showed that the cyanide content was 17.31mg / kg (the B-level limit value of cyanide in the exhibition land soil environmental quality evaluation standard is 8mg / kg).

[0013] Weigh 10.000g soil sample (through 10 mesh sieve) in 250mL Erlenmeyer flask, add chlorine dioxide disinfectant (ClO 2 ≥2%) formulated as...

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Abstract

The invention relates to a soil cyanide pollution treatment technique and discloses a chemistry restoration method used for soil with cyanide pollution. The existing treatment of the soil with cyanide pollution mostly focuses on plant restoration methods which are limited by growth conditions of plants and have long treatment period. The technique utilizes a chemistry method which takes a chlorine dioxide disinfector as an oxidant for treating the soil with cyanide, thus leading the cyanide in the soil to be up to environment safety standard. Aiming at the different contents of the cyanide in the soil, parameters of oxidant concentration, treatment time and temperature, and the like can be regulated in certain range until the soil with cyanide pollution comes up to the standard of state soil environmental quality assessment.

Description

technical field [0001] The invention relates to soil cyanide pollution control technology, in particular to a chemical restoration method for cyanide polluted soil. Background technique [0002] Because cyanide has good complexation, surface activity, and activation properties, in recent years, with the development of industries such as gold mining, smelting, electroplating, organic chemicals, and mineral processing, the amount of cyanide has increased greatly, which has also brought soil cyanide. pollution problem. [0003] The natural degradation rate of cyanide in soil is much slower than that in natural water, and the migration behavior of cyanide in soil profile is similar to that of soluble salt in soil. Under arid and semi-arid climate conditions, cyanide in the profile can be highly enriched in the salt crust on the soil surface. The slime layer in the soil profile can partially block the migration of cyanide to the phreatic water, which in turn can lead to a high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08A62D3/30
Inventor 仇荣亮张涛邹泽李董汉英仇浩赵芝灏蔡信德
Owner SUN YAT SEN UNIV
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