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Ferric salt strengthened electrokinetic remediation device for heavy metal pollution in e-waste dismantling place

An electronic waste and electrodynamics technology, applied in water pollutants, electronic waste recycling, chemical instruments and methods, etc., can solve the problems of high operation cost and complex application, reduce repair errors, improve repair efficiency, and improve electrolytic repair. The effect of efficiency

Active Publication Date: 2017-05-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the prior art, the hydroxide ions generated by the catholyte enter the soil remediation area to form an alkaline zone, which causes the precipitation of heavy metal ions and inhibits electrokinetic remediation. Some pH control technologies have high operating costs and complex practical applications. Problem, the present invention provides an iron-salt-enhanced electrokinetic remediation device for heavy metal pollution from electronic waste dismantling, which can control the pH value of contaminated soil in the remediation system at a lower operating cost

Method used

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  • Ferric salt strengthened electrokinetic remediation device for heavy metal pollution in e-waste dismantling place

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Experimental program
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Effect test

Embodiment 1

[0035] Take 3000.0 g of contaminated soil from the electronic waste dismantling site with pH value of 7.45, lead, cadmium, and zinc concentrations of 150, 15, and 750 mg / kg respectively, adjust the moisture content of the soil to 45%, and place it in the electrolytic cell. The catholyte uses 1 mol / L FeCl 3 solution, the anode is 0.5 g / L citric acid solution, and the iron salt solution is added through a constant flow pump to maintain the concentration of the electrolyte during the repair process. After repairing for 400 h, the removal rates of Pb, Cd, and Zn were 76.2%, 70.41%, and 71.23%, respectively.

Embodiment 2

[0037] Take 3000.0 g of contaminated soil from the electronic waste dismantling site with pH value of 7.45, lead, cadmium, and zinc concentrations of 150, 15, and 750 mg / kg respectively, adjust the moisture content of the soil to 45%, and place it in the electrolytic cell. The catholyte uses 3 mol / L FeCl 3 solution, the anode is 0.5 g / L citric acid solution, and the iron salt solution is added through a constant flow pump to maintain the concentration of the electrolyte during the repair process. After repairing for 400 h, the removal rates of Pb, Cd, and Zn were 79.76 %, 73.64 %, and 74.16 %, respectively.

Embodiment 3

[0039] Take 3000.0 g of contaminated soil from the electronic waste dismantling site with pH value of 7.45, lead, cadmium, and zinc concentrations of 150, 15, and 750 mg / kg respectively, adjust the moisture content of the soil to 45%, and place it in the electrolytic cell. The catholyte uses 5 mol / L FeCl 3 solution, the anode is 0.5 g / L citric acid solution, and the iron salt solution is added through a constant flow pump to maintain the concentration of the electrolyte during the repair process. After repairing for 400 h, the removal rates of Pb, Cd, and Zn were 82.46 %, 74.12 %, and 74.84 %, respectively.

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Abstract

A ferric salt strengthened electrokinetic remediation device for heavy metal pollution in an e-waste dismantling place is characterized in that a cathode chamber and a ferric salt electrolyte thereof and an anode chamber and a citric acid electrolyte thereof are arranged at two sides of a soil chamber and are separated from the soil chamber through porous partitions wrapped by filter paper, a cation exchange membrane is arranged on a partition between a carbon fiber chamber and the cathode chamber, a cathode pH induction pin and an anode pH induction pin control a cathode pump and an anode pump to add required solutions into the cathode chamber and the anode chamber, a cathode pH control chamber and an anode pH control chamber are arranged to control the pH values of the electrolytes, and an aeration device is arranged on the bottom end surface of the anode chamber to adjust the electrolytes. According to the ferric salt strengthened electrokinetic remediation device, an electrolysis device and an electric control device are combined, the traditional electrodynamics and the cation exchange membrane technology are combined, the frequency of collision between heavy metal pollutants and activated carbon fibers is effectively improved under the action of the electric field, and the remediation efficiency is improved.

Description

technical field [0001] The invention relates to a repairing device for heavy metal-contaminated soil from dismantling electronic waste, in particular to an electrodynamic repairing device for iron-salt-strengthened heavy metal-contaminated soil from dismantling electronic waste. Background technique [0002] With the rapid development of science and technology, electronic waste, a new environmental killer, has become a wide variety of solid electronic waste with rapid growth. Solid electronic waste is generally divided into two categories: one is waste electronic products that contain relatively simple materials and are less harmful to the environment when disassembled, such as household appliances such as refrigerators, washing machines, air conditioners, and scientific research and medical appliances; The first category is waste electronic products that contain relatively complex materials and are extremely harmful to the environment when dismantled, such as lead in comput...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B01D53/04C02F1/28C02F101/20
CPCB01D53/04C02F1/283B09C1/085C02F2101/20B01D2253/102Y02W30/82
Inventor 祝方刘文庆任文涛
Owner TAIYUAN UNIV OF TECH
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