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Device of leaching and electrokinetically remediating chromium slag stacking place by nanometer zero-valent iron and nickel

A nano-zero-valent iron and electrodynamic technology is applied in the field of devices for remediating chromium slag-contaminated soil, which can solve the problems of great harm and high hexavalent chromium content, and achieve the effect of improving efficiency

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

The content of hexavalent chromium in chromium-contaminated sites is very high, and it is easy to spread, which is a great potential threat to the surrounding environment. If it is not handled properly, it will be very harmful

Method used

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  • Device of leaching and electrokinetically remediating chromium slag stacking place by nanometer zero-valent iron and nickel
  • Device of leaching and electrokinetically remediating chromium slag stacking place by nanometer zero-valent iron and nickel
  • Device of leaching and electrokinetically remediating chromium slag stacking place by nanometer zero-valent iron and nickel

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A device for electrokinetic repairing of chromium slag piles by nanometer zero-valent iron-nickel leaching. The cathode and anode are electrodes made of graphite plates, which are connected to the negative and positive electrodes of the power supply respectively; the volume ratio of the cathode and anode chambers to the soil chamber is Both are 1:3; the chromium concentration is 150 mg / kg taken from the soil of the chromium slag stacking site; the voltage is 30 V, the anolyte is citric acid-sodium citrate buffer solution with pH=3, and the cathode is 3 mol / L FeCl 3 solution, the concentration of the eluent was 3 g / L, and the experiment period was 144 h. The heavy metal content in the soil sample was determined by flame atomic absorption; the removal rate of chromium was 85.6%.

Embodiment 2

[0049] A device for electrokinetic repairing of chromium slag piles by nanometer zero-valent iron-nickel leaching. The cathode and anode are electrodes made of graphite plates, which are connected to the negative and positive electrodes of the power supply respectively; the volume ratio of the cathode and anode chambers to the soil chamber is Both are 1:3; the chromium concentration is 150 mg / kg taken from the soil of the chromium slag stacking site; the voltage is 30 V, the anolyte is citric acid-sodium citrate buffer solution with pH=3, and the cathode is 5 mol / L FeCl 3 solution, the concentration of the eluent was 3 g / L, and the experiment period was 144 hours. The heavy metal content in the soil sample was determined by flame atomic absorption; the removal rate of chromium was 86.7%.

Embodiment 3

[0051] A device for electrokinetic repairing of chromium slag piles by nanometer zero-valent iron-nickel leaching. The cathode and anode are electrodes made of graphite plates, which are connected to the negative and positive electrodes of the power supply respectively; the volume ratio of the cathode and anode chambers to the soil chamber is Both are 1:3; the chromium concentration is 150 mg / kg taken from the soil of the chromium slag stacking site; the voltage is 30 V, the anolyte is citric acid-sodium citrate buffer solution with pH=3, and the cathode is 3 mol / Fe of L 2 (SO 4 ) 3 solution, the concentration of the eluent was 3 g / L, and the experiment period was 144 hours. The heavy metal content in the soil sample was determined by flame atomic absorption method; the removal rate of chromium was 87.8%.

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Abstract

The invention discloses a device of leaching and electrokinetically remediating a chromium slag stacking place by nanometer zero-valent iron and nickel. The device comprises an electrokinetic remediation device and a leaching system; the electrokinetic remediation device is arranged on the upper end surface of a soil chamber between a cathode chamber and an anode chamber and is provided with eluent nozzles of the leaching system to carry out spraying on the soil chamber through the eluent nozzles, thus automatic continuous remediation of heavy metal contaminated soil is realized. According to the device, by utilizing the electrokinetics and a nanometer zero-valent iron-nickel double metal eluent to commonly remediate the soil, the remediation time of the soil is effectively shortened, and the remediation efficiency of the soil is improved.

Description

technical field [0001] The invention relates to a restoration device for polluted soil in chromium slag stacking places, specifically a kind of iron salt as catholyte, nanometer Fe / Ni bimetal as eluent, and electrodynamic technology and leaching technology together to restore chromium A device that pollutes soil with slag. Background technique [0002] my country is the world's largest producer of chromium salts, with an annual output of more than 160,000 tons. However, a large amount of chromium-containing waste residues are produced in the production process. About 600,000 tons of chromium slag are newly discharged every year in the country, and nearly 4 million tons of chromium slag have been piled up over the years. Chromium slag contains 0.3-1.5% soluble Cr(VI). After rainfall and surface water scouring, Cr(VI) enters the surrounding soil and groundwater, causing serious pollution to the environment. At present, the soil seriously polluted by Cr(VI) in my country reach...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/085Y02P10/20
Inventor 祝方任文涛刘涛
Owner TAIYUAN UNIV OF TECH
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