Contaminated soil ex-situ electrokinetic remediation device and method thereof

A technology of polluted soil and electric restoration, which is applied in the field of ex-situ restoration of polluted soil, which can solve problems such as increased power consumption, difficulty in acceptance work, and prolonged electric restoration time, achieving high work efficiency, low energy consumption, and a wide range of applications.

Inactive Publication Date: 2012-12-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The emergence of focal points has brought great difficulties to the acceptance work after site restoration
In addition, the movement speed of pollutants in the focal zone is much lower than that in the place where there is no focal zone, which also leads to several times longer electric restoration time and correspondingly increased power consumption of the entire site
The research on electrodynamic restoration has a history of more than 20 years. There are a large number of successful cases in laboratory research, but there are few practical engineering applications. The unpredictability of on-sit

Method used

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  • Contaminated soil ex-situ electrokinetic remediation device and method thereof
  • Contaminated soil ex-situ electrokinetic remediation device and method thereof
  • Contaminated soil ex-situ electrokinetic remediation device and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1:

[0038] In this embodiment, the porous layer I4 includes two upper and lower layers, which sandwich the soil.

[0039] Further, the soil bearing system further includes two porous layers II 11 arranged in the porous layer I4, and the porous layer II 11 encloses the soil. The porous layer I4 and / or the porous layer II11 is a filter cloth, and the upper and lower electrodes 2, 3 are in contact with the filter cloth.

[0040] The method of this embodiment includes the following steps:

[0041] 1) Soil pretreatment: The contaminated soil containing pollutants is wet crushed, tempered and filtered to form a mud, and then injected into the soil bearing system to form a thin mud layer less than 10cm thick1.

[0042] 2) Repair treatment: The upper and lower electrodes 2, 3 are powered on, and the spray nozzle 7 sprays working fluid upward. Under the action of the electric field, the pollutants migrate downward in the thin mud layer 1 and are washed out by the working fluid...

Example Embodiment

[0045] Example 2:

[0046] In this embodiment, a water-permeable layer 5 is provided between the soil bearing system and the electrode working fluid spray system, and the spray nozzle 7 is embedded in the water-permeable layer 5. The bottom electrode 3 and the rigid water-permeable support layer 6 are sequentially installed below the water-permeable layer 5.

[0047] Furthermore, the electrode working fluid spray system further includes a water collection tank 8, a wastewater treatment unit 9, and a circulating water pump 10. After the working fluid sprayed through the spray nozzle 7 flows downward into the sump 8, it is processed by the wastewater treatment unit 9, and then enters the spray nozzle 7 again through the circulating water pump 10.

[0048] Compared with the method of embodiment 1, in the method of this embodiment, in the step 1, the water content of the mud is 15-60%, and the thickness of the thin mud layer 1 is 0.2-10 cm. In the step 2, the washed working fluid ente...

Example Embodiment

[0051] Example 3:

[0052] This embodiment provides a continuous production method, that is, on the basis of Embodiment 1 or 2, a traction device is also included. Generally, the traction device is connected to a) a soil carrying system, or b) an electrode system and an electrode working fluid spray system. Make a) the soil bearing system, and b) the electrode system and the electrode working fluid spray system relative movement.

[0053] As a preferred mode, the soil bearing system further includes two porous layers II11 arranged in the porous layer I4, and the porous layer II11 encloses the soil. The porous layer I4 and / or the porous layer II11 is a filter cloth, and the upper and lower electrodes 2, 3 are in contact with the filter cloth. The porous layer II11 is connected to the traction device.

[0054] The continuous method includes the following steps:

[0055] 1) Soil pretreatment: The contaminated soil containing pollutants is wet crushed, tempered and filtered to form a...

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Abstract

The invention provides a contaminated soil ex-situ electrokinetic remediation device and a method of the contaminated soil ex-situ electrokinetic remediation device, and aims to avoid the occurrence of the pollutant aggregation phenomenon and shorten the electrokinetic remediation time, so as to improve the electrokinetic remediation effect and reduce the electrokinetic remediation expense. In order to realize the aim of the invention, the adopted technical shame is as follows: the contaminated soil ex-situ electrokinetic remediation device comprises a soil bearing system, an electrode system and an electrode working solution spray system, wherein the bottom of the soil bearing system is a porous layer I; the electrode system comprises an upper electrode and a lower electrode which are arranged above and below the soil bearing system respectively, and in working, the charges carried by the upper electrode and the charges carried by the lower electrode are opposite; and the electrode working solution spray system comprises a plurality of spray nozzles which are arranged below the soil bearing system, and in working, the spray nozzles spray upwards working solution.

Description

technical field [0001] The invention relates to the field of heterotopic restoration of polluted soil. Background technique [0002] When the wastewater and solid waste generated in the industrial production process enter the soil, it will lead to soil pollution. The methods for remediation of contaminated soil mainly include: (1) Physical and chemical remediation: physical separation remediation, solidification / stabilization remediation, steam soaking Extraction restoration, electric restoration, chemical leaching restoration, solvent extraction restoration, high temperature incineration restoration, redox restoration, etc.; (2) Bioremediation: prepared bed method, soil composting method, mud bioreactor method, land cultivation method, etc. . According to whether the soil needs to be excavated, these technologies can be divided into in situ (in situ) remediation technology and ex situ (ex situ) remediation technology. In situ repair technology can be divided into in situ ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 李东谭雪莹范敏牛媛媛吴昕达
Owner CHONGQING UNIV
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