Method for in-situ repairing of organic pollutant soil by sodium persulfate and hydrogen peroxide compounded system

A technology of organic pollutants and sodium persulfate, applied in the field of environmental chemistry, can solve the problems of large amount of hydrogen peroxide, pulping, high cost, and achieve the effects of reducing harm, improving decomposition efficiency, and reducing the amount of pulping

Inactive Publication Date: 2018-08-17
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the remediation process of organic-contaminated soil, a single Fenton reagent has a strong dependence on the pH value during the in-situ remediation process, which is prone to generate slurry, consumes a large amount of hydrogen peroxide, and has disadvantages such as low remediation efficiency; Persulfate has the disadvantages of high cost, thermal activation, activation of metal ions, etc. to promote the reaction, and low repair effect.

Method used

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  • Method for in-situ repairing of organic pollutant soil by sodium persulfate and hydrogen peroxide compounded system
  • Method for in-situ repairing of organic pollutant soil by sodium persulfate and hydrogen peroxide compounded system
  • Method for in-situ repairing of organic pollutant soil by sodium persulfate and hydrogen peroxide compounded system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Utilize the compound system of sodium persulfate and hydrogen peroxide to remediate soil contaminated with aniline in situ

[0032] The aniline-contaminated area was selected from the polluted site of an abandoned pharmaceutical factory in Hubei. It was divided into square areas of 10m×10m, and the divided areas were leveled, positioned and drilled. Prepare mixed slurries of hematite and sodium persulfate, and mixed solutions of ascorbic acid, hydrogen peroxide, and water in chemically resistant plastic drums equipped with electric agitators. The prepared mixed slurry of hematite and sodium persulfate is injected into the injection well 1 through the high-pressure rotary grouting pile by means of injection while lifting, and the drill pipe is started again. The prepared mixed solution of ascorbic acid, hydrogen peroxide and water is injected into the soil contaminated with organic matter through the injection tube. Wherein, the dosage of hematite is 20Kg, the...

Embodiment 2

[0034] Example 2 Utilizing the compound system of sodium persulfate and hydrogen peroxide to remediate soil polluted by petroleum hydrocarbons in situ

[0035] The petroleum hydrocarbon polluted area was selected from a polluted site of a chemical plant in the north, and was divided into square areas of 10m×10m, and the divided areas were leveled, positioned and drilled. The prepared mixed slurry of magnetite and sodium persulfate is injected into the injection well through the high-pressure rotary grouting pile by the way of injection while lifting, and the drill pipe is started again. While the drill pipe is descending, the oxalic acid and hydrogen peroxide A mixed solution of water and organic matter is injected into the organic-contaminated soil through a hose built into the drill pipe. Among them, the dosage of magnetite is 12Kg, the ratio of magnetite and sodium persulfate is 0.5:1, the solid-liquid ratio of iron-containing minerals and sodium persulfate mixed slurry is ...

Embodiment 3

[0036] Example 3 Utilizing the compound system of sodium persulfate and hydrogen peroxide to remediate organochlorine-contaminated soil in situ

[0037] The organochlorine polluted area is selected from a polluted site of a chemical plant in the south. The soil mainly contains α-666, β-666, γ-666, and δ-666 organic chlorine pollutants. . Divide the site into square areas of 10m×10m for leveling, positioning and drilling. The prepared mixed slurry of siderite and sodium persulfate is injected into the injection well 1 through the high-pressure rotary grouting pile by the way of lifting while injecting, and then the prepared mixed solution of citric acid, hydrogen peroxide and water is passed through the injection pipe Injection of organic matter into contaminated soil. Among them, the dosage of siderite is 5Kg, the ratio of siderite and sodium persulfate is 0.2:1, the solid-liquid ratio of the mixed slurry of iron-containing minerals and sodium persulfate is 1:1, citric acid ...

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Abstract

The invention provides a method for in-situ repairing of organic pollutant soil by a persulfate and hydrogen peroxide compounded system. Iron-containing mineral and sodium persulfate paste is firstlyinjected into the soil in an in-situ injecting manner; and then a hydrogen peroxide and natural small-molecular acid solution is injected, and organic pollutant removing is performed. The method is good in repairing effect, and has the beneficial effects that manual heating for activating persulfate is not needed, manual pH value adjusting is not needed, cost is saved, and no secondary pollution is generated. The problems that in the process that a traditional singular sodium persulfate oxidizing system and a singular Fenton oxidizing system perform in-situ oxidizing repairing on the soil, efficiency is low, cost is high, it is needed to add a pH adjusting agent, and secondary pollution is caused easily are solved.

Description

Technical field: [0001] The invention belongs to the field of environmental chemistry, and mainly relates to a method for in-situ restoration of organic pollutant soil by a compound system of sodium persulfate and hydrogen peroxide, and is suitable for in-situ restoration of organic-polluted soil in industry, agriculture, petroleum, medicine and other industries. Background technique: [0002] Organic pollution is one of the main types of soil pollution. Many organic substances are difficult to be degraded by microorganisms in the soil in a timely manner, and the residual time is very long, which poses a great threat to human health. For example, 666, a typical representative of organochlorine pesticides, has the characteristics of high toxicity, high residues, and refractory degradation. It is one of the first 12 persistent organic pollutants controlled by the United Nations Environment Program International Convention. It is harmful to human production and production. Life...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 张礼知王小兵廖敏子
Owner HUAZHONG NORMAL UNIV
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