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Soil body repairing method based on soil gas-phase extraction and underground water gas injection

A technology of gas phase extraction and remediation method, which is applied in the fields of environmental protection and soil remediation. It can solve the problems of polluted groundwater, small processing scale, and inability to meet the remediation needs of large-area contaminated soil. It achieves accelerated remediation efficiency, compact structure, and strong reliability. The effect of combination performance

Inactive Publication Date: 2014-12-10
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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Problems solved by technology

However, this type of gas-phase extraction soil remediation device also has the following problems: ①The processing scale is small, which cannot meet the remediation needs of large-scale contaminated soil; Layer soil cannot achieve the purpose of completely remediating pollution

Method used

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  • Soil body repairing method based on soil gas-phase extraction and underground water gas injection
  • Soil body repairing method based on soil gas-phase extraction and underground water gas injection

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Embodiment

[0023] Embodiment: This embodiment specifically relates to a soil restoration method based on soil vapor extraction and groundwater gas injection. ) Two technologies, comprehensively remediate the unsaturated layer soil and groundwater with volatile organic compounds (VOCs), have a high remediation rate and can meet a large remediation area.

[0024] Such as figure 1 As shown, the soil restoration method based on soil gas phase extraction and groundwater gas injection in this embodiment specifically includes the following steps:

[0025] (1) Conduct on-site surveys on the polluted site, determine the soil properties of the site, the distribution of pollutants and other information to determine the restoration plan, including the division of restoration blocks, the setting of gas injection wells 16 and extraction wells 24, the depth of two horizontal wells 21, SVE optimum vacuum degree, gas injection limit pressure, etc.;

[0026] (2) The gas injection well 16 and the extract...

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Abstract

The invention discloses a soil body repairing method based on soil gas-phase extraction and underground water gas injection. The repairing method comprises the following steps: a gas injection well and an extraction well are paved by slotting and ditching; each of the gas injection well and the extraction well adopts a combined structure of a vertical well and a transverse well; the transverse well of the gas injection well is paved on soil of saturated zone under a contaminated region and the transverse well of the extraction well is paved on soil of non-saturated zone above the contaminated region; then grooves are backfilled and small holes are uniformly formed in the transverse wells; the gas injection well and the extraction well are connected with an underground water gas injection system arranged under the ground and a soil gas-phase extraction system; then the soil gas-phase extraction system is started to extract gas in the contaminated region by the transverse well of the extraction well; meanwhile, the underground water gas injection system is started and air is conveyed into the contaminated region by the transverse well of the gas injection well, so that a soil body with pollutants is repaired. The soil body repairing method has the advantages that the polluted soil body has strong air circulation efficiency and the repairing efficiency of the contaminated region can be accelerated; and the soil body repairing method is suitable for repairing a large area of soil polluted by VOC.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and soil restoration, and in particular relates to a soil restoration method based on gas phase extraction and groundwater gas injection. Background technique [0002] Groundwater and soil environment are precious natural resources and the basis for human survival. At present, organic pollution has surpassed radioactive pollution and heavy metal pollution, and has become the main type of groundwater and soil pollution. Its main forms include benzene series pollutants discharged by chemical enterprises, and soil pollution caused by organochlorine pesticides used in agriculture, especially oil pipelines. Accidents such as rupture and leakage of underground oil storage tanks have caused pollution of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) to the soil in the unsaturated layer (or called the aeration layer, Vadose Zone). These soil pollutions ofte...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 朱煜张辰谢胜吕永鹏谭学军陈嫣王磊程江
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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