Remediation method for soil contaminated by organic matter

Abstract

The invention discloses a remediation method for soil contaminated by organic matter. The remediation method comprises the following steps that A, heavy-pollution soil (1) enters a preheating device and is preheated through indirect heating of heat tail gas (31) coming from a thermal desorption device; B, the preheated heavy-pollution soil enters the thermal desorption device and is subjected to thermal desorption through indirect heating of heat flue gas (82) coming from a natural gas combustion device; C, the heavy-pollution soil subjected to thermal desorption enters a mixing device and is mixed with mild-pollution soil (6) entering the mixing device, so that mixed soil (10) is formed; and D, the mixed soil enters a low-temperature desorption device to be subjected to low-temperature desorption, and after being subjected to low-temperature desorption and qualified, the mixed soil is discharged. In the operation process, organic matter separated out through the preheating device, the thermal desorption device and the low-temperature desorption device and blowing air (9) form air (91) containing the organic matter, and after flowing out of the preheating device, the thermal desorption device and the low-temperature desorption device, the air containing the organic matter enters the natural gas combustion device. By means of the remediation method, the heavy-pollution soil and the mild-pollution soil can be remediated at the same time in different modes.

Description

technical field [0001] The invention relates to a method for remediating soil polluted by organic matter. Background technique [0002] With the development of industrialization and urbanization, in recent years, there have been a number of chemical plants, pesticide plants, oil refineries and coking plants that have been closed and relocated or are about to be decommissioned in my country. In the past production process of these enterprises, factors such as dumping and discharge of waste, leakage of chemical substances and other factors will inevitably cause serious site pollution problems. Most of the polluted sites are facing conversion of land use functions and secondary development, but the polluted soil in these sites will seriously threaten human health and environmental safety, and has become an urgent problem to be solved. [0003] According to the types of pollutants, polluted soil can be divided into organic polluted soil and inorganic polluted soil. Organic mat...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for remediating organic-contaminated soil, so as to solve the problems of low energy utilization rate in the prior art.

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