A device and method for soil remediation and preventing the spread of pollutants

Abstract

The invention discloses a device and method for repairing soil and preventing pollutant diffusion. The device comprises an in-situ pressurization component, an electrode dialysis component and an aftertreatment component. Firstly, injecting a mixed oxidant of hydrogen peroxide dry mist and low-temperature plasma air into polluted soil in an injection pressure mode, then organic pollutants in the soil can be rapidly oxidized and decomposed, and pollutant diffusion can be also effectively prevented by a low-temperature mode. The device is also provided with an electrode zone, the pollutants canbe in directed migration along with ions by using an electrolysis method, a dialysis layer is also arranged on the inner side of an electrode net, and sucked and accumulated pollutants can be baffledby using three-dimensional filtering cotton and can be further oxidized and decomposed through persulfate, so that the removal efficiency of the pollutants in the soil can be greatly improved. In a word, the device has the advantages that the structure is simple, the in-situ pollutant treatment velocity is rapid, and pollutant diffusion is not easily caused.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a device and method for soil remediation and preventing the diffusion of pollutants Background technique [0002] Soil is an important part of the ecological environment on which human beings depend. However, with the rapid development of urbanization and industrialization, organic pollutants will migrate into the soil environment during production and use, which not only destroys the ecosystem of the soil itself, It even poses a threat to groundwater resources, so soil protection and remediation of contaminated soil are increasingly concerned and valued at home and abroad. [0003] When organic pollutants enter the soil, they will change the physical and chemical properties of the soil, causing great harm to the crops and plants planted on the soil, and indirectly posing a serious threat to human health. In the prior art, the remediation of organic polluted...

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Problems solved by technology

[0003] When organic pollutants enter the soil, they will change the physical and chemical properties of the soil, causing great harm to the crops and plants planted on the soil, and indirectly posing a serious threat to human health.

In the prior art, the remediation of organic polluted soil uses ex-situ method or in-situ method for thermal desorption. The advantage of ex-situ method is that the pollutants are thoroughly purified and the problem of pollutant diffusion is not easy to occur, but the engineering cost is huge, and it is only suitable for It is used in a small area, and the thermal desorption method of the in-situ method often escapes and diffuses due to the high temperature causing the organic matter to be desorbed too late, which is equivalent to driving the organic pollution to another soil area, resulting in the inability to effectively remove the pollutants

[0004] In addition, there are chemical reagent oxidation methods for in-situ treatment. The contact rate between chemical reagents and pollutants is low, the reaction is slow, and it takes a long period. In addition, the reaction is not thorough and timely, which will also lead to unsatisfactory removal of pollutants.

Simple physical extraction often has a "tailing" phenomenon, resulting in ineffective removal of pollutants

Biological method is a relatively mild removal method. Although it has certain effects, it takes a long period of time to achieve satisfactory results.

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