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Method and device for obtaining uniform electric field for electrically repairing polluted soil

A technology of electrodynamic repair and uniform electric field, which is applied in the restoration of polluted soil, etc. It can solve the problems of electric restoration of polluted soil, difficulty in forming a uniform electric field, and inability to solve the distribution of electric field, so as to achieve good restoration effect, low cost and save time and cost effects

Active Publication Date: 2014-04-09
JIANGSU DDBS ENVIRONMENT REMEDIATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Since the existing various electrode rod electrodes are point or linear electrodes in the two-dimensional cross-section, the electric field distribution between the electrodes is in the shape of a hammer, and it is difficult to form a uniform electric field. The problem
Therefore, it is difficult to complete the electrodynamic restoration of polluted soil with a relatively uniform electric field required by the above-mentioned background technology, and the soil restoration effect of the method of combining heating and electric field is not good.

Method used

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  • Method and device for obtaining uniform electric field for electrically repairing polluted soil
  • Method and device for obtaining uniform electric field for electrically repairing polluted soil
  • Method and device for obtaining uniform electric field for electrically repairing polluted soil

Examples

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Effect test

Embodiment approach 1

[0025] according to figure 1 , taking the electric remediation technology of in-situ thermal desorption of soil to remediate organically polluted soil as an example to further illustrate, the initial voltage between A-B-C is 380V from the mains, and through a three-phase voltage regulating transformer, A 1 -B 1 -C 1 Between voltage U 1 or U 2 Make adjustments according to the repair situation, and the adjustment range is 20-480V. in A 1 -B 1 -C 1 U 1 or U 2After the voltage is applied, due to the existence of the soil's own resistance, the soil will heat itself between the electrodes. The heating of the soil will accelerate the volatilization of organic matter, and then use the extraction wells (not shown in the figure) arranged on the site to extract the organic matter from the ground for treatment, so as to achieve the purpose of repairing the soil. Electrokinetic healing and electric heating are performed by controlling the voltage on the electrodes and / or the cur...

Embodiment approach 2

[0027] according to figure 2 , taking the electrodynamic remediation technology of soil in-situ remediation of heavy metal-contaminated soil as an example to further illustrate, the voltage between A-B can be adjusted at the voltage U through the DC power supply voltage regulator according to the remediation situation. 0 or U 1 Make adjustments, the adjustment range is 20-600V, and the preferred voltage gradient is 1v / cm. in A 1 -B 1 U 1 After the voltage is applied, the soil acts as a conductor, and a DC electric field is formed between the two electrodes. Since the surface of soil particles has an electric double layer, and the ions or particles in the pore solution are charged, the aqueous solution in the soil pores under the electric field will generate electroosmotic flow and the charged ions will migrate. The main material migration includes electroosmosis, electromigration, and free diffusion. And electrophoresis, the superposition of multiple migration movements ...

Embodiment approach 3

[0029] according to figure 2 , take the electric remediation technology of in-situ remediation of phenol-contaminated soil in sandy soil as an example to further illustrate, the voltage between A-B can be adjusted according to the remediation situation through the DC power voltage regulator at the voltage U 0 or U 1 Make adjustments, the adjustment range is 20-600V, the preferred voltage gradient is 1v / cm, and the control current is at mA level. In the sandy polluted soil, the water content is 10-19%, and the initial microorganisms are artificially screened high-efficiency phenol bacteria with a concentration of 1.5×10 9 per gram of dry soil. The polarity is switched regularly, and the switching interval is generally 3 to 12 hours per time. The system runs continuously for 10 days. The average decomposition efficiency of phenol in the soil is about 65%, which is much higher than the degradation effect without an electric field. Comparing the switching frequencies of differ...

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Abstract

The invention discloses a method for obtaining a uniform electric field for electrically repairing polluted soil. The method comprises the following steps: digging grouped channels or grooves of certain widths and depths at certain intervals in a field needing soil repair; filling current-conducting carbon particles being phi1.5-phi5 millimeters in particle sizes into the grouped channels or grooves; placing leading-in terminals of a power supply into the current-conducting carbon particles in the grouped channels or grooves to form parallel electrodes, wherein the number of the electrodes is 2*N or 3*N, and N is a positive integer. By adopting the method, a uniform soil repair electric field can be provided, spindle type electric field distribution is eliminated, and the problems of the need of repairing microorganism-polluted soil with a completely symmetrical electric field and the like are particularly solved. Compared with the distribution of linear electrodes or matrix electrodes, the method has the advantages of simplicity and easiness in making electrodes, low cost and higher efficiency.

Description

technical field [0001] The invention relates to a method for electrokinetic restoration of polluted soil, in particular to a method and a device for obtaining a uniform electric field for electrokinetic restoration of polluted soil. Background technique [0002] The electrokinetic remediation technology (Electrokinetic remediation) of polluted soil is a green remediation technology that emerged in the 1990s. The basic principle of remediation of heavy metal-contaminated soil is to apply direct current in the soil / site to form a direct current electric field between the two electrodes, driving heavy metal ions to migrate along the direction of the electric field, thereby enriching the pollutants to the cathode area, and then passing through the electric field. Sedimentation, ion exchange and other methods can be separated to achieve the goal of restoration. The mechanism of remediation of organic polluted soil is more complex, mainly using various electrokinetic effects and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 刘志阳曾跃春赵申梅志华刘永林张坚毅
Owner JIANGSU DDBS ENVIRONMENT REMEDIATION
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