Magnetic separation enhanced type electromagnetic thermal desorption method and device for remediating soil

Abstract

The invention provides a magnetic separation enhanced type electromagnetic thermal desorption method and device for remediating contaminated sites. The method is characterized in that ferromagnetic materials, such as reducing iron powder, are doped into contaminated soil in an ex-situ mixing and stirring manner, the contaminated soil spirally stirred is heated by using electromagnetism, and a thermal desorption heat transfer gasifying effect is improved through the in-situ electromagnetic eddy heating of the ferromagnetic materials; the reaction activity and oxidation reduction capability of the ferromagnetic materials are improved when the ferromagnetic materials produce heat; after thermal desorption is finished, the ferromagnetic materials of which the surfaces react and adsorb pollutants can be separated from the contaminated soil through magnetic separation, recycled and reutilized; and the continuous remediation of contaminated soil is realized. The device also can be used for the in-situ remediation of contaminated soil. After the ferromagnetic materials are added to the soil in situ through a ploughing stirring device, the soil is heated in situ by utilizing an electromagnetic induction coil to carry out excitation eddy heating in the contaminated soil, pollutants are desorbed, and at the same time, the reaction activity of the magnetic materials(for example, reducing iron powder) can be improved; and after reaction is finished, the iron powder can be separated from the contaminated soil through a magnetic separation technology. The device also can be placed in soil to realize in-situ oxidation reduction degradation. The method and device are suitable for the in-situ thermal desorption remediation of circumjacent large area of low-concentration contaminated soil.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted sites, in particular to an environmental remediation technology and device for quickly and effectively separating pollutants in soil by using electromagnetic thermal desorption technology. Background technique [0002] With the development of society and the intensification of industrialization, the number of industrially polluted sites has gradually increased, causing serious environmental hazards; sudden water pollution incidents and petrochemical plant explosions have occurred from time to time, and the pollution of explosive or accidental polluted sites is common There are alkanes, benzene series, polycyclic aromatic hydrocarbons and other semi-volatile organic compounds. In order to ensure the ecological environment and human health, the remediation of contaminated soil in polluted sites has become an inevitable trend. [0003] As an important adsorption technology for contam...

AI Technical Summary

Problems solved by technology

Based on the current thermal separation equipment, there are problems such as low heat utilization rate and exhaustion of waste heat from flue gas.

Based on the current thermal separation equipment, there are problems such as low heat utilization rate and exhaustion of waste heat from flue gas.

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