Composite electrode for electro-kinetic remediation of heavy metal contaminated soil, electro-kinetic remediating device and electro-kinetic remediation method

A composite electrode and electrodynamic restoration technology, which is applied in the restoration of polluted soil, etc., can solve the problems of easy shedding of active materials, affecting the removal efficiency of pollutants, and the stability of current, so as to shorten the restoration period, shorten the restoration cost, and realize The effect of in situ removal

Inactive Publication Date: 2017-02-08
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the problems in the prior art that the active material layer attached to the electrode surface is easily blocked by the active material layer, which affects the pollutant removal efficiency and the ...

Method used

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  • Composite electrode for electro-kinetic remediation of heavy metal contaminated soil, electro-kinetic remediating device and electro-kinetic remediation method
  • Composite electrode for electro-kinetic remediation of heavy metal contaminated soil, electro-kinetic remediating device and electro-kinetic remediation method
  • Composite electrode for electro-kinetic remediation of heavy metal contaminated soil, electro-kinetic remediating device and electro-kinetic remediation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1. Preparation of a composite electrode for electrokinetic restoration of heavy metal-contaminated soil

[0043] (1) Preparation of modified sepiolite: the particle size of the modified sepiolite obtained by acid treatment modification, heat treatment modification and silane coupling agent modification is 20-100 mesh.

[0044] Acid treatment modification:

[0045] Use 1mol / L HCl to modify the sepiolite, and the solid-to-liquid ratio is 1:10 (if the sepiolite is 10g, HCl is 100ml). Shake in a constant temperature oscillator at a temperature of 50°C for 6 hours, centrifuge in a centrifuge at a speed of 4000r / min for 10 minutes to separate water and sepiolite, add deionized water to wash, centrifuge, and repeat washing and centrifugation for 3 to 5 times until The pH is around 6. After centrifugation, place in a desiccator at a temperature of 50°C to dry.

[0046] Heat treatment modification: the acid-modified sepiolite was calcined at 450°C for 4 hours, and the...

Embodiment 2

[0052] Example 2. Preparation of an electric repair device for heavy metal-contaminated soil (1) Preparation of electrolyte: this part belongs to the prior art, such as with 0.2mol / L of HNO 3 as an electrolyte.

[0053] The specific preparation steps are as follows: add concentrated nitric acid to a certain amount of water to prepare 0.2mol / L HNO 3 .

[0054] (2) Add electrolyte to the electrolytic cell, connect the composite electrode, graphite electrode, DC power supply, switch and other components of the device with wires, connect the power supply, and set the flow rate of the extraction pump to 0.01-0.05L / h.

[0055] (3) Deployment: Control the moisture content of the soil to be greater than 20%, the DC power supply voltage is 100V / m~600V / m, and the flow rate of the extraction pump is 0.01~0.05L / h to ensure efficient and stable operation of the device.

Embodiment 3

[0056] Embodiment 3. Use the composite electrode of embodiment 1 and the electrodynamic restoration device of embodiment 2 to remediate heavy metal polluted soil

[0057] The specific operation steps are as follows:

[0058] The prepared composite electrode is inserted into the electrolytic cell, the electrolyte is passed into the electrolytic cell, the circuit is connected to the composite electrode, graphite electrode, switch, and ammeter, the extraction pump is turned on, and then repaired.

[0059] Regularly monitor the changes in the concentration of heavy metals in the electrolytic cell and monitoring points, and record the pH and conductivity changes of the anode and catholyte in real time, and replace the composite electrode material when the conductivity exceeds a certain value.

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Abstract

The invention discloses a composite electrode for electro-kinetic remediation of heavy metal contaminated soil, an electro-kinetic remediating device and an electro-kinetic remediation method, and belongs to the technical field of remediation of heavy metal contaminated soil. The composite electrode disclosed by the invention is formed by a reticularly-coated composite material composed of conducting mediums; the composite material comprises modified sepiolite and modified chitosan; the composite material for the composite electrode disclosed by the invention is relatively large in surface area and is capable of adsorbing heavy metal ions coming from migration, so that in-site removal of heavy metal pollutants is realized, and cathode liquor needs not to be pumped out and treated subsequently after electro-kinetic remediation is ended. The electro-kinetic remediation method disclosed by the invention is capable of reducing pH changes near the cathode of the soil and preventing OH- generated by the cathode from entering the soil, so precipitation of heavy metal ions in the soil is avoided. By monitoring the pH near the anode and the cathode, the electric conductivity and concentration changes of heavy metal ions in real time, the electro-kinetic remediation method and the electro-kinetic remediating device disclosed by the invention have the advantages of being persistent, high in efficiency, simple and convenient in replacement and capable of remarkably shortening the remediation period and lowering the remediation cost.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a composite electrode and an electric remediation method for electric remediation of heavy metal-contaminated soil. Background technique [0002] Electric remediation technology is a technology that has been applied to treat contaminated soil since the late 1980s. Under the action of an electric field, heavy metal ions (such as Pb, Cd, Cu, Zn, etc.) and inorganic ions in the soil migrate to the electrodes in the form of electrodialysis and electromigration, and then they are collected and processed. This method is especially suitable for low-permeability clay soils, which can control the flow direction of pollutants. Soil pH directly affects the adsorption and desorption, precipitation and dissolution of heavy metal ions in soil solution. In the electrode reaction, a large amount of OH produced by the cathode - , so that the pH value near t...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/085B09C2101/00
Inventor 刘阳李季李庆韦云霄郝弟谢倩
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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