Low-temperature deabsorption repairing process used for polluted soil

Abstract

The invention relates to a low-temperature deabsorption repairing process used for polluted soil, comprising three stages, namely polluted soil preparation stage, low-temperature deabsorption stage and tail gas treatment stage. In the polluted soil preparation stage, after being conveyed to a low-temperature deabsorption workshop, the polluted soil are processed into a plurality of elongated soil stacks by virtue of equipment; in the low-temperature deabsorption stage, the soil stacks are intermittently turned over by soil turning equipment to volatilize pollutants in the soil and the turned soil is detected regularly; and in the tail gas treatment stage, gas carrying the pollutants after volatilization are led out by a centrifugal exhaust fan, and the gas is dedusted by a cloth bag and absorbed by triple-effect activated carbon absorption so as to realize the clean discharge of the tail gas. In the invention, based on the characteristic that the pollutants in the soil are easy to volatilize at normal temperature, the soil is turned over to volatilize the pollutants; enforced drawing ventilation is carried out on air in an airtight workshop, the gas carrying the pollutants is dedusted and absorbed by activated carbon, and finally the pollutants in the soil are removed by deabsorption, thus effective repairing of the polluted soil is realized.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil restoration, in particular to a low-temperature desorption restoration method for contaminated soil. Background technique [0002] Soil is one of the natural resources that human beings depend on for survival. With the development of industrial and agricultural production, a large number of potentially toxic pollutants enter the soil through various channels, making soil pollution more and more serious, causing many countries to face increasingly prominent soil pollution problems. In addition, soil pollution will also affect other environments. The medium also plays a role. The control and remediation of polluted soil has become a major environmental science issue in our country and even in the world. [0003] At present, the remediation technology of polluted soil mainly adopts chemical treatment method or biological treatment method. The chemical treatment method is to spray a chemi...

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Problems solved by technology

However, due to the high concentration of chemical remediation agents, when the soil is repaired, it is bound to remain in the soil and combine with other components. If it is not handled properly, it will cause secondary pollution to the soil.

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