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Ex-situ chemical oxidation remediation method for cyanide-contaminated soil

A technology of polluted soil and chemical oxidation, applied in the field of contaminated site remediation, can solve problems such as remediation of cyanide-contaminated soil that have not been applied on a large scale, and achieve the effect of eliminating the risk of secondary pollution

Active Publication Date: 2017-09-08
爱土工程环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical oxidation technology is relatively mature in the treatment of cyanide-contaminated wastewater, but this technology has not been widely used in the remediation of cyanide-contaminated soil in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation of embodiment 1 chelating resin

[0043] Add 10g of chloromethylated styrene, 0.8g~1.2g of pyridine, 0.01g~0.02g of cuprous bromide and 3g of acrylonitrile into 100mL of dimethylformamide, vacuumize the reaction vessel, and pass Nitrogen was circulated 3 times, stirred and reacted at a temperature of 70°C for 3 hours to obtain modified polystyrene, and 5% by mass of EDTA solution and methanol were mixed according to a volume ratio of 1:1 to obtain a mixed solution, and the modified polystyrene Ethylene was put into the mixed solution and stirred for 24 hours, then washed with water, and finally dried under vacuum at a temperature of 25°C.

[0044] In the infrared spectrum of chloromethylated styrene at 2935cm -1 and 1450cm -1 There is an absorption peak at 760cm -1 and 690cm -1 There is an absorption peak at 2240cm -1 The characteristic absorption peak of nitrile group appeared at , indicating that acrylonitrile had been grafted onto the surface of ...

comparative test 1

[0064] The polluted site that uses natural gas, liquid ammonia, aniline, formaldehyde, ferrous sulfate, etc. Cyanide-containing wastewater and waste residue pollution, the total cyanide content is 1983mg / kg, and the easy-to-release cyanide content is 32.2mg / kg.

[0065] The cyanide-contaminated soil is repaired, and the specific implementation method is as follows:

[0066] (1) Contaminated soil pretreatment: carry out pretreatment such as impurity removal, crushing and screening on the contaminated soil;

[0067] (2) Humidification and stirring of polluted soil: Stir the polluted soil and water evenly according to the mass ratio of 1:0.3, and the soil water content is close to saturation;

[0068] (3) Activation of double oxidant: Dissolve ammonium persulfate in water to prepare a solution with a concentration of 0.3mol / L, mix it with hydrogen peroxide at a volume ratio of 2:1, then adjust the pH value of the mixed solution to 7.5, and add the activator phosphoric acid The ...

comparative test 2

[0073] The polluted site that uses natural gas, liquid ammonia, aniline, formaldehyde, ferrous sulfate, etc. Cyanide-containing wastewater and waste residue pollution, the total cyanide content is 1983mg / kg, and the easy-to-release cyanide content is 32.2mg / kg.

[0074] The cyanide-contaminated soil is repaired, and the specific implementation method is as follows:

[0075] (1) Contaminated soil pretreatment: carry out pretreatment such as impurity removal, crushing and screening on the contaminated soil;

[0076] (2) Humidification and stirring of polluted soil: Stir the polluted soil and water evenly according to the mass ratio of 1:0.3, and the soil water content is close to saturation;

[0077] (3) Activation of double oxidant: Dissolve ammonium persulfate in water to prepare a solution with a concentration of 0.3mol / L, mix it with hydrogen peroxide at a volume ratio of 2:1, then adjust the pH of the mixed solution to 7.5, and add oxalic acid as an activator The amount o...

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Abstract

The invention discloses an ex-situ chemical oxidation remediation method for cyanide-contaminated soil, and belongs to the field of contaminated land remediation. The method comprises the following steps: performing humidifying and uniform stirring on the cyanide-contaminated soil after being subjected to pretreatments such as impurity removal, crushing and screening, adding a double oxidant prepared from activated persulfate and hydrogen peroxide, and thoroughly mineralizing cyanide in the soil to convert cyanide into innoxious substances, so as to reduce the concentration of cyanide in the soil. According to the ex-situ chemical oxidation remediation method for the cyanide-contaminated soil, the double oxidant prepared from activated persulfate and hydrogen peroxide is used, so that the concentration of cyanide in the soil is effectively reduced, the secondary contamination risk of the cyanide-contaminated soil is eliminated, the soil after remediation can be used for backfill, the land use function is not affected, and normal development and utilization are feasible.

Description

technical field [0001] The invention belongs to the field of contaminated site restoration, and in particular relates to a method for ectopic chemical oxidation of cyanide-contaminated soil. Background technique [0002] In the production activities of pesticide production, metal mining, mineral processing, smelting, chemical industry and other industries, cyanide enters the soil through sewage irrigation, waste residue, equipment leakage, leakage and other forms, causing soil pollution. The presence of cyanide in the soil will affect the growth of plants. At the same time, soil cyanide may cause a series of secondary pollution. For example, the leaching of cyanide by rainwater may lead to the diffusion of cyanide, groundwater and surface water pollution, and cause damage to the ecological environment of water bodies. hazard, therefore, cyanide-contaminated soil remediation is necessary. [0003] The remediation methods of cyanide-contaminated soil mainly include incinerati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/40C09K101/00
CPCB09C1/08C09K17/40C09K2101/00
Inventor 吴启模周愈尧段建宏李娜张凤英肖伟洪源源何依琳
Owner 爱土工程环境科技有限公司
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