Freezing isolation and in-situ thermal desorption integrated system and treatment method for contaminated soil

Abstract

The invention relates to a freezing isolation and in-situ thermal desorption integrated system and a treatment method for contaminated soil. The system comprises a plurality of freezing wells uniformly distributed along the edge of a repairing area at equal intervals, a cooling system communicating with the cooling wells, heating wells located in the repairing region, a heating system communicating with the heating wells, extraction wells located in the repairing region and a suction system connected to a suction system; the space between two adjacent freezing wells is smaller than 1m and the distance between each of the heating wells and each of the freezing wells is greater than 2m; the cooling system comprises freezing circulating pipes put in the freezing wells and a frozen fluid injection system, the outlet of the frozen fluid injection system communicates with the freezing wells, and flow pressure gauges are arranged on the inner side and the outer side of each of the freezing wells; and the heating system heating pipes put in the heating wells and a hot steam injection system, and the outlet of the hot steam injection system communicates with the heating wells. By combining a freezing isolation barrier technology with a soil thermal desorption technology, the freezing isolation and in-situ thermal desorption integrated system for the contaminated soil is designed.

Description

technical field

[0001] The invention belongs to the field of groundwater restoration in environmental protection, and in particular relates to an integrated system of freezing isolation and in-situ thermal desorption of polluted soil. Background technique

[0002] In recent years, with the relocation of industrial enterprises, the number of polluted sites in the city has gradually increased, forming a potential environmental threat to surrounding residents, occupying valuable land resources in the city, and affecting the sustainable development of the city. There may be a wide variety of pollutants in polluted sites, including heavy metal pollutants and organic pollutants, some of which are cumulative and likely to pose a threat to surrounding populations. Therefore, it is necessary to remediate such contaminated sites. There are more than a dozen common soil remediation techniques, which can be divided into three categories: physical, chemical and biological methods. [0...

Examples

Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] according to Figure 1 to Figure 3 The integrated system of cooling isolation and in-situ thermal desorption of contaminated soil shown includes multiple freezing wells distributed evenly and equidistantly along the edge of the remediation area, a cooling system connected to the cooling wells, a heating well located in the remediation area, and The heating system connected to the heating well, the extraction well located in the repair area and the suction system connected to the suction system; the distance L between adjacent freezing wells is less than 1 meter, and the distance between the heating well and the freezing well is greater than 2 meters; the extraction well and the heating well The distance between the extraction well and the freezing well is greater than 1 meter; the cooling system includes a refrigeration circulation pipe ...

technical field

[0001] The invention belongs to the field of groundwater restoration in environmental protection, and in particular relates to an integrated system of freezing isolation and in-situ thermal desorption of polluted soil. Background technique

[0002] In recent years, with the relocation of industrial enterprises, the number of polluted sites in the city has gradually increased, forming a potential environmental threat to surrounding residents, occupying valuable land resources in the city, and affecting the sustainable development of the city. There may be a wide variety of pollutants in polluted sites, including heavy metal pollutants and organic pollutants, some of which are cumulative and likely to pose a threat to surrounding populations. Therefore, it is necessary to remediate such contaminated sites. There are more than a dozen common soil remediation techniques, which can be divided into three categories: physical, chemical and biological methods. [0...

Examples

Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] according to Figure 1 to Figure 3 The integrated system of cooling isolation and in-situ thermal desorption of contaminated soil shown includes multiple freezing wells distributed evenly and equidistantly along the edge of the remediation area, a cooling system connected to the cooling wells, a heating well located in the remediation area, and The heating system connected to the heating well, the extraction well located in the repair area and the suction system connected to the suction system; the distance L between adjacent freezing wells is less than 1 meter, and the distance between the heating well and the freezing well is greater than 2 meters; the extraction well and the heating well The distance between the extraction well and the freezing well is greater than 1 meter; the cooling system includes a refrigeration circulation pipe ...

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