In-situ combined remediation technology for contaminated soil

A technology of combined restoration of contaminated soil, applied in the field of contaminated soil restoration and treatment, to achieve good treatment effects, ensure safety and stability, and reduce mobility and biological activity

Inactive Publication Date: 2014-04-16
QINGDAO NEW WORLD ENVIRONMENT PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention proposes an in-situ combined restoration technology for contaminated soil, which uses the combined use of in-situ leaching and in-situ stabilization / curing, combines the advantages of in-situ leaching and in-situ stabilization / curing, and makes up for the To overcome their respective shortcomings, the processing effect is better

Method used

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Examples

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Embodiment

[0023] Taking a chromium-contaminated site as an example, the length of the pollution area is about 220m, the width is about 25m, and the thickness is about 6m. 65mg / L. The specific implementation plan is as follows:

[0024] (1) Soil in-situ leaching:

[0025] (1.1) Send the leaching liquid to the injection well, use the leaching liquid to flow through the contaminated soil by its own gravity, dissolve Cr(VI) through the leaching liquid, and transfer the pollutants in the soil to the liquid phase to accelerate the soil;

[0026] (1.2) The extraction well extracts the eluent containing pollutants and collects them in the sewage treatment equipment;

[0027] (1.3) Treat the eluate containing pollutants in the sewage treatment equipment, and return to step (1.1) for recycling. After several times of leaching, the concentration of Cr(VI) in the leachate of the extraction well drops to 80% of the initial concentration. When the change range of Cr(VI) concentration does not exce...

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Abstract

The invention discloses an in-situ combined remediation technology for contaminated soil. The in-situ combined remediation technology adopts a method for combined use of an in-situ leaching technology and an in-situ stabilization solidification technology, and comprises the following steps: feeding leaching liquid into an injection well, extracting the pollutant-containing leaching liquid through an extraction well, and treating the pollutant-containing leaching liquid in wastewater treatment equipment; after leaching, injecting a stabilization agent into a polluted region through the injection well adopted in an in-situ leaching process, and controlling the flow direction of the stabilization agent by virtue of the extraction well to realize recycling; after stabilizing, injecting a solidification agent by virtue of the injection well, isolating site pollutants from an environment, and filling soil gaps. According to the in-situ combined remediation technology, the advantages of in-situ leaching and in-situ stabilization/solidification are combined and a treatment effect is good.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of polluted soil, and in particular relates to an in-situ joint remediation technology of polluted soil. Background technique [0002] With the continuous acceleration of industrialization and urbanization in our country, the problem of soil environmental pollution is becoming more and more serious. About 10% of the farmland soil is polluted, and the relocation of enterprises leaves hundreds of thousands of hectares of polluted sites, which poses a threat to the sustainable use of land resources and the ecological safety of agricultural products. , the treatment of polluted sites is imminent. Soil remediation can be divided into in-situ remediation and ex-situ remediation according to the site. Ex-situ remediation not only has high processing costs, but also is difficult to treat sites where deep soil and groundwater are polluted. Therefore, the development of a variety of in si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
Inventor 韩清洁
Owner QINGDAO NEW WORLD ENVIRONMENT PROTECTION CO LTD
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