A method and system for heat treatment and restoration of polluted soil

Abstract

The invention discloses a thermal treatment restoration method and system for contaminated soil. The thermal treatment restoration method for the contaminated soil comprises the following steps: crushing, conveying, burning, thermally desorbing, recovering heat energy, neutralizing with acidic materials, and dedusting. The system for executing the method comprises a soil crusher, a first carrier roller belt conveyor with a sealed cabin, a paddle dryer, a second carrier roller belt conveyor with the sealed cabin, and a rotary kiln thermal desorption unit, wherein pipes are arranged at all of the soil crusher, the first carrier roller belt conveyor, the paddle dryer, the second carrier roller belt conveyor and the rotary kiln thermal desorption unit and communicated with a secondary combustor. According to the thermal treatment restoration method and the thermal treatment restoration system disclosed by the invention, the organic matters, diffusing into the atmosphere, in the soil can be reduced; the organic matters can be completely transformed into water, carbon dioxide and other non-toxic innocuous substances, and then safely discharged through exhaust gas treatment; the heat energy in the system can be reutilized, so that the system energy consumption can be further reduced, and the economic efficiency is good; the treated soil can be recycled.

Description

technical field [0001] The invention relates to the technical field of environmental treatment engineering, in particular to a heat treatment restoration method and system for polluted soil. Background technique [0002] In the process of remediation of contaminated soil, heat treatment technology will be used, which belongs to physical remediation technology and is one of the important technologies in the field of soil remediation. At present, the remediation technology of organic-contaminated soil is mainly divided into in-situ remediation technology and ex-situ remediation technology. Among them, the ex-situ remediation is to excavate the contaminated soil and treat it on the ground. Thermal desorption technology is a kind of ex-situ repair technology. This technology generally requires the soil to be pre-crushed, transported, and pre-heated before treatment to make the soil particles smaller and homogeneous, while reducing the moisture content in the soil and creating ...

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Problems solved by technology

Due to the volatility of some organic substances, some organic substances have volatilized into the atmosphere before entering the thermal desorption unit during the restoration process, causing secondary pollution to the surrounding environment and causing health problems for construction workers and people around the construction site. damage on

The Chinese patent application number 201310349547.8 also proposed to use thermal desorption technology to remediate organic polluted soil, but it did not deal with the secondary pollution prevention of organic matter and the deep treatment of exhaust gas during soil crushing and transportation during the remediation process.

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