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Contaminated soil remediation method

A technology of contaminated soil and remediation method, applied in the field of remediation of contaminated soil, can solve the problems of high processing cost, large area, long reaction period, etc., and achieve the effects of simple operation, strong adaptability and strong oxidative activity

Inactive Publication Date: 2020-08-07
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a method for remediating polluted soil, which is an efficient and green in-situ remediation or ex-situ remediation technology for polluted soil, which can make the pollutants in the soil, especially Efficient and green removal of cyanide, which solves the problems of difficult operation, long reaction cycle, high processing cost and large floor area of ​​the existing technology

Method used

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Examples

Experimental program
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Effect test

preparation example 1

[0070] This preparation example provides a transition metal tetraamide-based macrocyclic ligand oxidation catalyst, which is prepared by the following method:

[0071] (1) In a 500mL round-bottomed flask, add 70mL of triethylamine into the ethanol solution, and use the ethanol solution to adjust the volume to 300mL; In the ethanol solution, heat at 60°C in a water bath, and use magnetic stirring under reflux at a speed of 800rpm to obtain a mixed solution A; in another 500mL round bottom flask, mix 52g dimethylmalonic acid with 211.5 g dicycloethylcarbodiimide was mixed in 300mL ethanol solution to obtain mixed solution B.

[0072] (2) Add the mixed solution B dropwise to the mixed solution A at a speed of 1 drop per second, and stir at a speed of 800rpm for 5h; After stirring, the solution was stirred for another 4h after the addition, and allowed to settle for 24h.

[0073] (3) Add deionized water to the above solution drop by drop until the top layer of the crystal is dis...

Embodiment 1

[0078] The present embodiment provides a kind of remediation method of polluted soil, comprises the steps:

[0079] The soil is repaired by leaching, and the soil is leached 3 times with tap water. Each leaching uses 20 times the tap water of the soil volume to obtain the leaching waste liquid, and the transition metal tetraamide prepared in Preparation Example 1 is added thereto. Based macrocyclic ligand oxidation catalyst and hydrogen peroxide, the concentration of the transition metal tetraamide-based macrocyclic ligand oxidation catalyst in the leaching waste liquid is 15 μmol / L, and the hydrogen peroxide in the rinsing waste liquid The concentration in the solution was 25 g / L, and the reaction was carried out at 25° C. and a pH value of 10.5 for 150 min. After the reaction, the residual cyanide concentration in the soil sample was detected by a spectrophotometer, and the removal rate was calculated.

Embodiment 2

[0081] The present embodiment provides a kind of remediation method of polluted soil, comprises the steps:

[0082] The soil is repaired by leaching, and the soil is leached 5 times with tap water. Each leaching uses tap water 20 times the volume of the soil to obtain the leaching waste liquid, and the transition metal tetraamide prepared in Preparation Example 1 is added thereto. Based macrocyclic ligand oxidation catalyst and hydrogen peroxide, the concentration of the transition metal tetraamide-based macrocyclic ligand oxidation catalyst in the leaching waste liquid is 10 μmol / L, and the hydrogen peroxide in the rinsing waste liquid The concentration in the solution was 40 g / L, and the reaction was carried out at 20° C. and a pH value of 8.5 for 180 min. After the reaction, the residual cyanide concentration in the soil sample was detected by a spectrophotometer, and the removal rate was calculated.

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Abstract

The invention relates to a contaminated soil remediation method. The method comprises the following step: treating contaminated soil by using a transition metal tetraacylamino macrocyclic ligand oxidation catalyst and an oxidizing agent in a leaching mode or a non-leaching mode to remove pollutants in the soil. According to the remediation method, the overall use amount of a remediation agent is low, the remediation agent can be degraded or recycled, and secondary pollution caused by introduction of new pollutants into a reaction system is avoided; and pollutants, especially cyanogen, in the soil can be efficiently and greenly removed, the adaptability is high, the application range is wide, operation is easy, no filler or carrier needs to be added, the problems that in the prior art, operation is difficult, the reaction period is long, the treatment cost is high, and the occupied area is large are solved, and industrial application is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating polluted soil. Background technique [0002] With the rapid development of modern society, natural environment pollution has become the focus of social attention, and soil pollution has attracted the attention of all sectors of society. Soil pollution will not only destroy the properties of the original soil, but also directly affect the growth, development and reproduction of animals and plants, and ultimately affect human health. Therefore, the remediation of soil pollution has become an important research field. The purpose of contaminated soil remediation is to remove pollutants, restore soil properties, and reuse them. The choice of soil pollution remediation technology is affected by many factors: environmental conditions, pollutant sources and toxicity, current and potential hazards of pollutants, whether they cause secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08C09K17/40C09K109/00
CPCB09C1/02B09C1/08B09C2101/00C09K17/40C09K2109/00
Inventor 李庭刚殷学平王国辉韦漩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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