Soil thermal desorption treatment system and method

Abstract

The invention discloses a soil thermal desorption treatment system used for treatment of pollutants in soil of a site. The soil thermal desorption treatment system comprises a heap-shaped mound formedby the soil piled up on the site, a thermal desorption treatment assembly embedded in the mound and a sealing layer covering the surface of the mound; the thermal desorption treatment assembly comprises a heating pipe and an extracting pipe which are respectively used for heating the mound and discharging the pollutants desorbed at high temperature. The soil is piled up to form the mould directly, the heating pipe and the extracting pipe are arranged in the mould to have the soil heated and the pollutants in the soil discharged, arrangement of a thermal desorption treatment space of a staticpressure chamber and the like which are excavated in the site is not needed, and workload in thermal desorption treatment is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection treatment, and in particular relates to a soil thermal desorption treatment system and treatment method. Background technique [0002] Thermal desorption technology belongs to a heat treatment technology, that is, through heat exchange, the organic pollutants in the soil are heated to a sufficient temperature so that the pollutants can be volatilized or separated from the soil particles and enter the gas treatment system. [0003] At present, the commonly used thermal desorption treatment technology in China is mainly ectopic thermal desorption technology, that is, the contaminated soil is transferred to the treatment site through excavation, and then disposed of in a continuous or intermittent manner. Usually, the equipment used occupies a large area. In the restoration of polluted sites such as urban relocation chemical plants, there are few hardened open spaces around, and it i...

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Problems solved by technology

However, there are still many deficiencies in this thermal desorption treatment method: 1. The high-temperature gas is directly passed into the soil, and the pollutants in the high-temperature gas will remain in the soil, forming secondary pollution; 2. It is necessary to set up a static pressure chamber, which increases the The workload of thermal desorption treatment; 3. High-temperature gas enters the soil mound from the bottom, penetrates the soil and then leaves from the top of the soil. Poor, it is difficult to take away all the pollutants, and the treatment effect is not good

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