Vacuum negative-pressure medicine injection and polluted soil in-situ compulsive leaching method and device

A technology of vacuum negative pressure and polluted soil, applied in the field of polluted soil treatment, can solve problems such as difficulty in adopting, restricting popularization and application, etc.

Inactive Publication Date: 2019-09-10
BEIJING ZHONGYAN DADI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is difficult to use in the in-situ treatment of contaminated soil, and there are only a few occasions where the flow of water under the action of gravity can be used to wash the contaminated soil, which greatly limits the popularization and application of this method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The original site of a factory is clay, with a permeability coefficient of 3.78 10-6cm / s; a moisture content of 42%; it has been polluted by polychlorinated biphenyls (PCBs), the content of PCBs in the soil is 47mg / kg, and the depth of the contaminated soil reaches 7m. It is planned to use iron-palladium bimetallic nanoparticles for dechlorination and harmless treatment of polluted soil, and adopt the vacuum negative pressure agent injection technology of the present invention.

[0030] On the polluted site, insert a strip-shaped working body with an insertion depth of 8m; the distance between each row of working bodies is 100cm, and the distance between each working body in each row is 100cm; the adjacent working bodies in each row of working bodies are respectively connected to a vacuum negative pressure source And the liquid supply source, the adjacent working bodies in each column of working bodies are also connected to the vacuum negative pressure source and the liq...

Embodiment 2

[0034] The polluted soil under the chromium slag dump discharged from the chromium salt production workshop of a former chemical plant is silty clay with a permeability coefficient of 7.2410-5cm / s and a moisture content of 36%. In the dry matter, the total Cr content is 21036 (mg / kg), and the Cr (VI) content is 3464 (mg / kg); pH=10.9; the depth of the contaminated soil reaches 5m. Adopt the technology of the present invention to carry out vacuum negative pressure forced rinsing and decontamination treatment.

[0035] On the polluted site, insert strip-shaped working bodies with an insertion depth of 8m; the distance between the working bodies in each row is 100cm, and the distance between the working bodies in each row is 30cm; the working bodies in each row are arranged in parallel and staggered by 15cm in parallel. The strip-shaped working body rows connected to the vacuum negative pressure source and the strip-shaped working body rows connected to the liquid supply source ar...

Embodiment 3

[0039] An airport in the western region is built on a saline soil foundation. After many years of use, due to the migration of salt with groundwater, it is enriched in the soil layer under the runway and the road surface of the airport. Due to the crystallization and expansion of salt, the runway and the field are uneven, and the situation continues to deteriorate. Affect the normal use of the airport. In order to restore the smoothness of the runway and the track, the technology of the present invention is used to perform forced salt washing and grouting.

[0040] For the uplifted area of ​​the tunnel, the salt content is estimated according to the uplift. In each uplift area, drill holes on the pavement surface with a diameter of 2cm and a depth of 5m. Rod-type working body B is adopted, the diameter of the water guide pipe with a built-in pipe wall is 1cm, and the outer diameter of the corrugated pipe with many small holes in the pipe wall of the jacket is 2cm; the workin...

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Abstract

The invention discloses a vacuum negative-pressure medicine injection and polluted soil in-situ compulsive leaching method and device and belongs to the field polluted soil treatment. Working bodies which are capable of both uniformly conducting vacuum negative pressure within a whole length range and being filled with slurry are inserted into polluted soil according to designed intervals and depths, and the system is isolated from external air; a part of the working bodies are vacuumed, and the other part of the working bodies are filled with a liquid; and under sucking of the vacuum negativepressure, dense and continuous oriented liquid flows which are uniformly distributed are formed in the polluted soil, a chemical can be uniformly injected into the polluted soil, and soluble pollutants in the polluted soil can be continuously dissolved into the liquid flows and are compulsively sucked out. In-situ chemical injection of the polluted soil or in-situ compulsive leaching of the polluted soil can be achieved. Due to application of the vacuum negative pressure, soil structures are not damaged under high injection pressure, the injection performance in a low-permeability soil body can be improved, large-scale simultaneous treatment can be implemented, and the overall time can be shortened.

Description

technical field [0001] The invention relates to a method and device for vacuum negative pressure agent injection and in-situ forced leaching of polluted soil, belonging to the field of polluted soil treatment. Background technique [0002] The in-situ treatment technology of polluted soil, because it does not need to excavate the polluted soil, will not cause secondary pollution inside and outside the site, and does not even need to destroy the soil structure, it is the preferred solution in many occasions. Most of the in-situ treatment methods for contaminated soil need to inject chemicals into the contaminated soil, and a series of reactions will occur through the mixing of chemicals and contaminated soil to reduce the toxicity of pollutants or become non-toxic. However, it is difficult to inject chemicals in low-permeability contaminated soil, and the Poor mixing with chemicals makes it impossible to completely dispose of pollutants. Therefore, the application of in-situ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/02B09C1/08B09C2101/00
Inventor 刘金龙宋德君李建平黄新宋伟杰
Owner BEIJING ZHONGYAN DADI TECH CO LTD
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