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Device for electro-kinetic remediation of heavy metal contaminated soil by utilizing copper salt reinforced cathode

A technology of polluted soil and electric remediation, applied in the restoration of polluted soil and other directions, can solve the problems of heavy metal deposition, blockage, reduction of remediation efficiency, pH mutation, etc., to reduce experimental errors and achieve the effect of automation

Active Publication Date: 2017-02-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the electrode reaction will generate a large amount of OH at the cathode and anode respectively - and H + , causing the pH values ​​of the cathode and anolyte to increase and decrease, respectively. If there is no external restriction, in OH - and H + There will be a pH mutation at the neutralization point, which will cause heavy metal deposition to block the soil pores and reduce the restoration efficiency
At the same time, when the electrolyte is water, the efficiency of electrolysis is not high
In most electrokinetic experimental setups, there are various experimental errors due to human factors, resulting in lower repair efficiency

Method used

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  • Device for electro-kinetic remediation of heavy metal contaminated soil by utilizing copper salt reinforced cathode
  • Device for electro-kinetic remediation of heavy metal contaminated soil by utilizing copper salt reinforced cathode
  • Device for electro-kinetic remediation of heavy metal contaminated soil by utilizing copper salt reinforced cathode

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Effect test

Embodiment 1

[0033] The utility model relates to a device for electrodynamically repairing heavy metal polluted soil with a copper salt reinforced cathode. Both the cathode 1 and the anode 2 are electrodes made of graphite plates, and are respectively connected to the negative pole and the positive pole of a power supply 8 . The volume ratio of the cathode and anode chambers to the soil chamber is 1:3. The soil samples were collected from polluted soil in a certain place, and the concentrations of lead, cadmium, and zinc were 172, 13, and 650 mg / kg, respectively. The voltage was 30 V, the anolyte was citric acid-sodium citrate buffer solution with pH=3, and the cathode was 1 mol / L CuCl 2 Conductive solution, the experiment period is 400 h, and the heavy metals in the repaired soil samples are determined by flame atomic absorption method. After restoration, the removal rates of Pb, Cd and Zn were 72.8%, 70.6% and 70.2%, respectively.

Embodiment 2

[0035] The utility model relates to a device for electrodynamically repairing heavy metal polluted soil with a copper salt reinforced cathode. Both the cathode 1 and the anode 2 are electrodes made of graphite plates, and are respectively connected to the negative pole and the positive pole of a power supply 8 . The volume ratio of the cathode and anode chambers to the soil chamber is 1:1:3. The soil samples were collected from polluted soil in a certain place, and the concentrations of lead, cadmium, and zinc were 172, 13, and 650 mg / kg, respectively. The voltage is 30 V, the anolyte is citric acid-sodium citrate buffer solution with pH=3, and the cathode is 3 mol / L CuCl 2 Conductive solution, the experiment period is 400 h, and the heavy metals in the repaired soil samples are determined by flame atomic absorption method. After restoration, the removal rates of Pb, Cd and Zn were 75.1%, 73.6%, and 72.8%, respectively.

Embodiment 3

[0037] The utility model relates to a device for electrodynamically repairing heavy metal polluted soil with a copper salt reinforced cathode. Both the cathode 1 and the anode 2 are electrodes made of graphite plates, and are respectively connected to the negative pole and the positive pole of a power supply 8 . The volume ratio of the cathode and anode chambers to the soil chamber is 1:1:3. The soil samples were collected from polluted soil in a certain place, and the concentrations of lead, cadmium, and zinc were 172, 13, and 650 mg / kg, respectively. The voltage was 30 V, the anolyte was citric acid-sodium citrate buffer solution with pH=3, and the cathode was 5 mol / L CuCl 2 Conductive solution, the experiment period is 400 h, and the heavy metals in the repaired soil samples are determined by flame atomic absorption method. After restoration, the removal rates of Pb, Cd and Zn were 78.6 %, 75.3 % and 74.8 %, respectively.

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Abstract

The invention provides a device for electro-kinetic remediation of heavy metal contaminated soil by utilizing a copper salt reinforced cathode. According to the device provided by the invention, a soil chamber is arranged between a cathode chamber and an anode chamber; the volume ratio of the cathode chamber to the anode chamber to the soil chamber to an active carbon fiber chamber is 3 to 3 to (5-50) to 1; copper salt is used as a cathode electrolyte; a citric acid-sodium citrate buffer solution is used as an anode electrolyte; automatic remediation of the heavy metal contaminated soil is performed for 36 to 500 hours under a voltage of 5V to 50V. According to the device provided by the invention, the copper salt is used as the cathode electrolyte to promote an electro-kinetic reaction in an electrolysis process, and an electro-kinetic technology and a cation exchange membrane technology are combined to maintain the pH value of a soil sample within a certain acidity range during electrolysis; by virtue of a pH control and regulation system and a cathode electrolyte reflux system, the remediation efficiency is improved.

Description

technical field [0001] The invention relates to a repairing device for soil heavy metal pollution, in particular to an electrokinetic repairing device for soil polluted by heavy metals, which uses copper salt as catholyte and integrates electrokinetics and cation exchange membrane technology. Background technique [0002] The pollution of heavy metals in the soil is becoming more and more serious, and when crops are grown on polluted soil, these pollutants will enter the human body through the food chain. The cadmium rice incident in Japan is a vivid example. Therefore, heavy metal pollution and prevention in soil systems has always been a difficult and hot research topic in the world. At present, the remediation technologies for soil heavy metal pollution mainly include engineering measures, physical and chemical methods, chemical remediation methods and phytoremediation methods. Engineering measures are mainly based on excavation and landfill, the so-called guest soil met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/085B09C2101/00
Inventor 祝方任文涛刘文庆
Owner TAIYUAN UNIV OF TECH
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