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Device and method for repairing polluted soil and underground water by adopting composite electrode

A composite electrode and polluted soil technology, which is applied in the field of repairing heavy metal-organic compound polluted soil and groundwater, and repairing heavy metal-organic compound polluted soil and groundwater. It can solve low oxidation efficiency, low permeability, difficult to cover polluted areas, etc. Problems, easy to replace, long-lasting and efficient effect

Active Publication Date: 2016-11-23
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, practice has proved that the oxidant added by the in-situ chemical oxidation technology is easily limited by the low permeability and heterogeneity of the formation medium, and is prone to produce channel effect, that is, the oxidant only flows along several relatively high-permeable medium channels, and it is difficult to Covers the entire contaminated area, resulting in inefficient oxidation

Method used

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  • Device and method for repairing polluted soil and underground water by adopting composite electrode
  • Device and method for repairing polluted soil and underground water by adopting composite electrode

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preparation example Construction

[0034] The preparation method of the composite electrode: the selected persulfate slow-release material, hydrogen-based bentonite, activated carbon and kaolin components are added in proportion to distilled water, stirred and mixed evenly, then applied to the surface of the graphite rod-shaped electrode, and left to air dry for later use.

[0035] The active material layer in the composite electrode can both neutralize the high concentration of OH caused by the cathode reaction - Ions can also adsorb heavy metal pollutants and oxidized organic pollutants. The composite electrode active material layer has high efficiency, long duration, easy replacement and simple operation.

[0036] The DC power supply of the present invention can be a constant voltage DC power supply, and the electric field strength is 10V / m-800V / m. The sliding rheostat of the present invention is selected as 0-500Ω.

[0037] The method for repairing heavy metal-organic compound polluted soil and groundwater...

Embodiment

[0042]A leak at a gas station caused soil and groundwater pollution. The soil and groundwater pollutants were mainly Cu, Pb, and TPH. The polluted groundwater was the first aquifer, with a buried depth of 3.5m and a thickness of 2.6m. According to the device and method provided by the invention, its design is completed. For the cathode composite electrode, select persulfate slow-release materials, hydrogen-based bentonite, activated carbon and kaolin, add distilled water according to the mass ratio of 4:3:1:2, stir and mix evenly, apply it to the surface of the graphite rod-shaped electrode, and let it dry naturally for later use. Adjust the soil water content of the site to be 35%. The electrolytic solution used in the cathodic electrolytic cell and the anode electrolytic cell is 0.5mol / L sodium chloride solution. m, set the repair room length: width: depth to 5m×5m×6.1m. Graphite rod-shaped electrode is selected as the anode electrode, and there are 3 composite electrodes a...

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Abstract

The invention discloses a device for repairing polluted soil and underground water by adopting a composite electrode. The device comprises an electric repair device, a direct-current power supply, an ammeter, a slide rheostat, the composite electrode and a graphite electrode, wherein the electric repair device consists of a repair chamber, a cathode electrolytic cell, an anode electrolytic cell and electrolyte storage tanks; the repair chamber comprises composite polluted soil and the underground water; the cathode electrolytic cell and the anode electrolytic cell are arranged at the two ends of the repair chamber; the composite electrode is mounted in the cathode electrolytic cell; the surface of the composite electrode is coated with an active material; the graphite electrode is mounted in the anode electrolytic cell; the cathode electrolytic cell and the anode electrolytic cell are respectively connected with an electrolyte storage tank; a monitoring probe is mounted between the cathode electrolytic cell and the anode electrolytic cell; the direct-current power supply, the ammeter and the slide rheostat are connected in series between the composite electrode and the graphite electrode. The invention also discloses a method for repairing polluted soil and underground water by adopting the above device.

Description

technical field [0001] The invention belongs to the technical field of remediation of inorganic-organic compound polluted soil and groundwater, and more specifically relates to a device for remediating heavy metal-organic compound polluted soil and groundwater by using a composite electrode. [0002] The invention also relates to a method for remediating heavy metal-organic compound polluted soil and groundwater by using the device. Background technique [0003] Electrokinetic remediation technology uses an external DC electric field to remove pollutants from soil and groundwater through electrokinetic effects (electromigration, electrodialysis, and electrophoresis) in specific reaction devices. This technology has attracted the attention of scholars from various countries because of its wide application range, short repair period and no secondary pollution. [0004] During the electrokinetic repair process, the extreme pH environment generated by the electrode reaction is ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/002B09C1/085B09C2101/00
Inventor 席北斗姜永海杨昱廉新颖徐祥健马志飞梁冠男
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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