Electrodynamic force-reinforced leaching in-situ restoration apparatus for persistent organic contaminated soil

An organic pollution and persistent technology, applied in the restoration of polluted soil, etc., can solve the problems of soil organic matter and soil water damage, large energy consumption, etc., and achieve the effect of promoting hydrolysis and migration

Active Publication Date: 2013-06-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantage is that it is easy to destroy soil organi...

Method used

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  • Electrodynamic force-reinforced leaching in-situ restoration apparatus for persistent organic contaminated soil
  • Electrodynamic force-reinforced leaching in-situ restoration apparatus for persistent organic contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0032]First, insert the electrode anode 2 and the electrode cathode 3 at the two ends of the polluted soil respectively, and at the same time inject a sodium acetate solution with a concentration of 0.05~0.1 mol / L into the electrode anode 2 as the anode buffer solution, and the electrode cathode 3 with a concentration of 0.01~0.05 mol / L potassium nitrate solution as the cathode buffer solution. The electrodes and repair materials were introduced into a specially designed hollow tube, which was 51 cm wide, 5 cm thick, and 17-18 m long; the hollow tube was welded by four hollow tubes with a width of 12.7 cm and a wall thickness of 5 cm. The hollow pipe is mounted on an 18-meter-high tower mast. It is moved and rammed into the ground by a crane and a vibratory pile driver. The hollow pipe is 14 meters into the ground and 3 meters are exposed on the ground. The electrode is composed of iron filings and Loresco coke, and the electrode is about 13.7~14.0 m into the ground. A DC vo...

Embodiment 2

[0036] A certain range of PAHs-contaminated soil was selected around the fertilizer plant for treatment. The structure of the restoration device used was the same as in Example 1. There were 4-5 injection wells at the anode of the electrode, and 4-5 extraction wells at the cathode of the electrode. An aqueous n-butylamine solution with a volume concentration of 15% to 25% was used as the eluent, and NaOH with a concentration of 0.01 mol / L was used as the anode buffer to maintain the alkaline conditions of the anode. Apply a periodic voltage with a voltage gradient of 2 VDC / cm for five days, and then use a chemical solution of n-butylamine with a volume concentration of 15% to 25% as the eluent to wash the soil for 4 to 6 hours. This cycle is repeated for about 1000 hours. In the initial stage, nickel ions move to the electrode cathode 3 under the action of electromigration. However, with the pH and eluent washing, nickel will gradually precipitate and no longer migrate to the e...

Embodiment 3

[0038] A certain range of contaminated soil was selected in the lead-contaminated soil site for processing, and the structure of the processing device adopted was the same as in Example 1. The soil near the electrode anode 2 was inserted into the injection well 4, and the soil near the electrode cathode 3 was inserted into the extraction well 5. The contaminated soil with a lead content of 440 mg / kg was treated. The voltage gradient is 1.5 V / cm, and the EDTA aqueous solution with a concentration of 0.1-0.3 mol / L is selected as the chemical leaching reagent. The electromotive force action time is about 300 hours, and the lead removal rate can reach about 70% after the test.

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Abstract

The invention especially relates to an electrodynamic force-reinforced leaching in-situ restoration apparatus for persistent organic contaminated soil, which belongs to the technical field of environmental protection. The apparatus provided by the invention comprises a power supply, an anode, a cathode, injection wells, extraction wells, a leaching agent store room, a solid-liquid separator, a leaching agent reusing and treating device, an anode chamber and a cathode chamber. According to the invention, the novel anode and the novel cathode are designed, so electrodialysis, electrophoresis and electromigration effects can be greatly improved; hydrolysis and migration of persistent organic pollutants can be effectively promoted; a certain number of the injection wells and the extraction wells are respectively inserted to the anode and the cathode, and pollutants wrapped by a leaching agent are migrated to the cathode through combination of an electrodynamic force and chemical leaching so as to achieve the effect of reinforced removal of the pollutants; and through combination of reinforcement of the electrodynamic force, a removal rate of the pollutants can reach 63 to 98%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an in-situ restoration device for electrodynamically enhanced leaching of persistent organic polluted soil. Background technique [0002] In recent years, with the acceleration of my country's urbanization process and industrial transfer, as well as the implementation of national policies such as "retreating from the second to the third" and "retreating from the city to the park", a large number of persistent organic pollutants caused by the closure and relocation of enterprises have emerged. contaminated site. At present, most persistent organic pollution sites are facing conversion and secondary development of land use functions, such as: commercial land, residential buildings, etc. Potentially high-risk contaminated soil in these sites will become a "chemical time bomb" for human beings, seriously threatening human health and environmental safety, ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 张一梅张超陆俊卢宏伟
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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