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...

AI Technical Summary

Problems solved by technology

Thermal desorption remediation technology is suitable for treating volatile and semi-volatile organic pollutants in soil, but not for heavy metal pollutants

Images