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An anode electrocatalytic electrode for electrically repairing cyanide-contaminated soil, an electrodynamically repairing device and a repairing method

A technology for electrodynamic restoration and contaminated soil, which is applied in the field of contaminated soil restoration. It can solve the problems of unsuitable low-permeability soil, incomplete treatment effect, and low cyanide removal effect, achieving complete treatment effect, good removal effect, and small disturbance. Effect

Active Publication Date: 2019-11-08
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved in the present invention is to overcome the low removal effect of cyanide in the soil in the repair method of the prior art, the treatment effect is not complete, and the defect that is not suitable for low-permeability soil, thereby providing a kind of electric repair cyanide Anode electrocatalytic electrode, electrodynamic restoration device and restoration method for chemically polluted soil

Method used

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  • An anode electrocatalytic electrode for electrically repairing cyanide-contaminated soil, an electrodynamically repairing device and a repairing method
  • An anode electrocatalytic electrode for electrically repairing cyanide-contaminated soil, an electrodynamically repairing device and a repairing method

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Embodiment 1. prepare anode electrocatalytic electrode (Ti / PbO 2 electrode)

[0055] Sand the metal titanium mesh 600 mesh sandpaper with a thickness of 1.5mm twice. Heat the rinsed titanium mesh in lye (NaOH) with a concentration of 40% (mass / volume percentage), take out the titanium plate after 2 hours, rinse it with water, and then place the titanium plate in a 1:1 volume ratio HNO 3 and H 2 SO 4 Soak in the mixed solution for 2h. After taking it out, rinse it off quickly, put it into boiling oxalic acid solution (15% mass / volume percentage) and cook until reddish-brown substances appear near the surface of the titanium mesh.

[0056] The titanium mesh was taken out from the oxalic acid solution and put into the electrodeposition solution immediately. Select a stainless steel plate with the same area as the cathode, and control the electrodeposition current density to 20mA / cm 2 , after an appropriate time to obtain PbO 2 Electrodeposition coating. Electrodep...

Embodiment 2

[0057] Example 2. Treatment of cyanide enriched to the anode

[0058] When the total cyanide concentration in the anolyte is low (below 50mg / L), only the anode electrocatalytic electrode oxidation treatment is required to degrade cyanide into non-toxic substances;

[0059] When the total cyanide concentration in the anolyte is high (above 50mg / L), the electrolyte needs to be pumped out for treatment, and the membrane absorption method can be used to recover cyanide.

Embodiment 3

[0060] Example 3. Preparation of an electrokinetic remediation device for cyanide-contaminated soil

[0061] (1) The soil moisture content is set to 20% to 40%, and 0 to 2mol / L sodium hydroxide solution (the specific concentration is determined according to the content of cyanide in the soil) is added to the electrolytic cell near the electrode. Arrange the corresponding cathode and anode electrodes, connect the anode electrocatalysis electrode, cathode electrode, DC power supply, switch and other components with wires, cover the isolation cover, open the extraction pump, and connect the power supply.

[0062] Install and connect the electrolyte circulation control system in sequence, the specific steps are as follows:

[0063] Connect the lean liquid tank and the hollow fiber membrane contactor, connect the sedimentation tank of the hollow fiber membrane contactor through the lumen of the hollow fiber membrane, and connect the hollow fiber membrane contactor and the circulati...

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Abstract

The invention relates to the technical field of contaminated soil remediation, in particular to an anode electro-catalysis electrode for electrokinetic remediation of cyanide contaminated soil, an electrokinetic remediation device and a remediation method. The anode electro-catalysis electrode is a Ti / PbO2 electrode prepared through electro-deposition PbO2 of a mesh-shaped titanium substrate composed of conducting mediums. According to the electrode, under the action of a direct-current electric field, cyanide is gathered towards the anode of the electrode, and by means of a method of degrading the cyanide into nontoxic substances or electrolyte to be extracted out through catalytic oxidation via electrode surface electro-catalysis of the anode, in-situ removing of the cyanide contaminated soil is achieved. Compared with a conventional remediation method, the method has the beneficial effects that the disturbance to the cyanide contaminated soil is weak, and harm caused when the human directly makes contact with the cyanide released by soil remediation disturbance is avoided.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, and in particular relates to an electric remediation method for electric remediation of cyanide-contaminated soil. Background technique [0002] In recent years, with the development of industries such as metal smelting, electroplating, and coking, a large amount of toxic cyanide-containing wastewater and waste residues have been produced, which have been discharged without effective treatment, resulting in serious soil cyanide pollution problems in many areas of our country. . Cyanide in the soil has a serious impact on the growth of plants. Soil polluted by cyanide becomes a secondary pollution source in the environment, and has long-term potential harm to the surface environment, land use, surface water, and groundwater. Therefore, there is an urgent need for cyanide pollution. Remediation of chemically contaminated soil. [0003] At present, the conventional cyanide-con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 孙尧李季刘鹏谭勇壁许超邢轶兰
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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