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In-situ combination remediation method of high-concentration petroleum hydrocarbon contaminated soil

A technology of contaminated soil and remediation method, which is applied in the field of in-situ combined remediation of high-concentration petroleum hydrocarbon-contaminated soil. efficiency effect

Inactive Publication Date: 2016-08-17
NTGS ENVIRONMENTAL REMEDIATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical remediation method has the characteristics of high repair efficiency, fast decomposition speed, and is suitable for high pollution. Chemical oxidation technology can effectively degrade petroleum hydrocarbon pollutants in the soil in a short time, but when the pollution concentration is low, the chemical oxidation method is not efficient and wastes chemicals. , and other secondary pollutants will be produced while chemical oxidation degrades macromolecular petroleum hydrocarbons; the cost of bioremediation technology is low, and it will not cause secondary pollution, but microorganisms are not conducive to growth in high-concentration petroleum hydrocarbon polluted environments, so It takes a long time and low efficiency to directly use the microbial restoration method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An in-situ combined restoration method for high-concentration petroleum hydrocarbon-contaminated soil, comprising the following steps:

[0023] (1) Pretreatment of contaminated areas: for soil thickness of 30cm and area of ​​100m 2 Water-stop curtains shall be built around the polluted area to prevent the in-situ mixing process from aggravating the migration of pollution due to the stirring of soil and groundwater, causing pollution to areas outside the polluted area.

[0024] (2) Oxidant configuration: use Fenton’s reagent and sodium persulfate as the oxidant, and process it by in-situ stirring method. The oxidant is polluted soil according to: sodium persulfate: hydrogen peroxide: FeSO4 7H2O=48~52:3~7:4~ Dosing at a ratio of 6:1, add an appropriate amount of water, and use a powerful stirring head to stir continuously;

[0025] (3) Bacterial flora cultivation: Screen the microbial degrading flora with oil-degrading properties from soil polluted by petroleum hydrocarb...

Embodiment 2

[0031] On the basis of embodiment 1, a kind of high concentration petroleum hydrocarbon polluted soil in-situ combined restoration method comprises the following steps:

[0032] (1) Pretreatment of contaminated areas: for soil thickness of 30cm and area of ​​100m 2 Water-stop curtains shall be built around the polluted area to prevent the in-situ mixing process from aggravating the migration of pollution due to the stirring of soil and groundwater, causing pollution to areas outside the polluted area.

[0033] (2) Oxidant configuration: Fenton’s reagent and sodium persulfate are used as oxidants, and the treatment is carried out by in-situ stirring method. The oxidants are processed according to the ratio of polluted soil: sodium persulfate: hydrogen peroxide: FeSO4 7H2O=50:5:5:1 Dosing, add an appropriate amount of water, and use a strong stirring head to keep stirring;

[0034] (3) Bacterial flora cultivation: Screen the microbial degrading flora with oil-degrading properti...

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Abstract

The invention discloses an in-situ combination remediation method of high-concentration petroleum hydrocarbon contaminated soil. The in-situ combination remediation method comprises the following six steps: pollution region pretreatment, oxidizer preparation, flora culture, nitration liquid preparation, feeding of flora liquid and nitration liquid and bio-ventilation. By virtue of combined use of a reinforced chemical oxidation technique and a microbial remediation technique, the remediation time can be greatly shortened, so that the remediation efficiency is beneficially improved; by virtue of bio-ventilation and bio-stimulation methods, the degradation of microorganisms to petroleum hydrocarbon pollutants can be greatly improved, and the remediation efficiency can be improved. According to the in-situ combination remediation method, the problems that the efficiency is low, reagents are wasted, and other secondary pollutants are generated during the chemical oxidative degradation of macromolecule petroleum hydrocarbon in a chemical oxidization method are overcome, and problems of long remediation time and low efficiency in the direction use of microbial remediation method are solved.

Description

technical field [0001] The invention relates to the technical field of restoration of high-concentration petroleum hydrocarbon-contaminated soil, in particular to an in-situ combined restoration method for high-concentration petroleum hydrocarbon-contaminated soil. Background technique [0002] Soil remediation refers to the use of physical, chemical and biological methods to transfer, absorb, degrade and transform pollutants in the soil, reducing its concentration to an acceptable level, or converting toxic and harmful pollutants into harmless substances. Fundamentally speaking, the technical principles of contaminated soil remediation can include: (1) Change the form of pollutants in the soil or the way they combine with the soil to reduce their mobility and bioavailability in the environment; ( 2) Reduce the concentration of harmful substances in the soil. [0003] The soil is originally a natural shelter and purification treatment place for various wastes. The soil acce...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/105B09C2101/00
Inventor 陆晓松郑伟王儒汪洋周睿
Owner NTGS ENVIRONMENTAL REMEDIATION
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