Photochemical reduction repairing method for soil polluted by hexavalent chromium

A technology of polluted soil and remediation method, applied in the restoration of polluted soil, etc., to achieve the effect of reducing secondary pollution, low cost, and high degradation rate

Inactive Publication Date: 2013-09-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been a lot of reports on the conversion of chromium in the water phase by photochemical remediation methods, but there are few reports on the treatment of chromium pollution in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 0.2g K 2 Cr 2 o 7 Dissolve in 100mL of deionized water, adjust the pH to 7.0, then add 100g of kaolin, stir and sonicate for 30 minutes, put it in a 125°C thermostat for drying as simulated soil. Take 1g of soil, wash the soil with 10mL 0.02g / L [S,S]-EDDS, filter after ultrasonic vibration, then add ultrasonic vibration to the filtered solution and then filter, add Fe to the filtered solution 3+ , citric acid, making Fe in solution 3+ The concentrations of citric acid and citric acid were respectively 10 μmol / L and 60 μmol / L, the pH was adjusted to 3.0, and a simulation experiment was carried out using an ultraviolet lamp as a light source. After 10min and 20min, samples were taken to determine the content of Cr(IV). The soil washing efficiency was 98%, Cr(IV) decreased by 70% after 10 minutes of light, and 85% after 20 minutes of light.

[0030]

Embodiment 2

[0032] Take 0.2g K 2 Cr 2 o 7 Dissolve in 100mL of deionized water, adjust the pH to 7.0, then add 100g of kaolin, stir and sonicate for 30 minutes, put it in a 125°C incubator and dry it as simulated soil. Take 1g of soil, wash the soil with 8mL 0.02g / L [S,S]-EDDS, filter after ultrasonic vibration, then add ultrasonic vibration to the filtered solution and then filter, add Fe to the filtered solution 3+ , citric acid, making Fe in solution 3+ The concentrations of citric acid and citric acid were respectively 20 μmol / L and 60 μmol / L, the pH was adjusted to 3.0, and a simulation experiment was carried out using an ultraviolet lamp as a light source. After 10min and 20min, samples were taken to determine the content of Cr(IV). The soil washing efficiency was 98%, Cr(IV) decreased by 85% after 10 minutes of light, and 95% after 20 minutes of light.

[0033]

Embodiment 3

[0035] Take 0.2g K 2 Cr 2 o 7 Dissolve in 100mL of deionized water, adjust the pH to 7.0, then add 100g of kaolin, stir and sonicate for 30 minutes, put it in a 125°C incubator and dry it as simulated soil. Take 1g of soil, wash the soil with 10mL 0.02g / L [S,S]-EDDS, filter after ultrasonic vibration, then add ultrasonic vibration to the filtered solution and then add Fe 3+ , sodium oxalate, so that Fe in the solution 3+ The concentrations of sodium oxalate and sodium oxalate were 40 μmol / L and 40 μmol / L respectively, the pH was adjusted to 3.0, and a simulation experiment was carried out using an ultraviolet lamp as a light source. After 10min and 20min, samples were taken to determine the content of Cr(IV). The soil washing efficiency was 98%, the Cr(IV) decreased by 95% after 10 minutes of light, and the Cr(IV) decreased by 95% after 20 minutes of light.

[0036]

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Abstract

The invention provides a photochemistry reduction repairing method for soil polluted by hexavalent chromium. The method has the advantages that operation is simple, chromium can be directly removed from polluted soil, and secondary pollution is avoided. The technology scheme of the method comprises following steps: (1) soil polluted by hexavalent chromium is dip rinsed by a [S,S]-EDDS eluent; (2) the soil processed by the step (1) is filtered, and after solid-liquid separation, iron salt and multi-carboxylate are added into the eluent; (3) hexavalent chromium is subjected to a photochemical reduction reaction in the presence of light. The photochemical reduction repairing method for soil polluted by hexavalent chromium has the advantages that operation is simple, cost is low, hexavalent chromium in polluted soil can be high-effectively separated and degraded, and secondary pollution is avoided.

Description

[0001] technical field [0002] The invention belongs to the technical field of remediation and treatment of contaminated soil, and in particular relates to a method for photochemical reduction and remediation of hexavalent chromium-contaminated soil. Background technique [0003] At present, my country's soil heavy metal pollution is becoming more and more serious, seriously endangering food security and people's lives. After the soil is polluted by heavy metals, it not only destroys its original functions, but also accumulates heavy metals along the biological chain. And produce greater harm along with biological earth cycle. [0004] Different from other environmental media, soil has its unique physical and chemical properties and biological characteristics, especially the typical multiphase interface (including soil surface gas phase, surface water phase or interstitial water phase, and soil particle solid phase, and may also involve biological phases). ), so the soil ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 吴峰吉冰冰焦黎白利杰
Owner WUHAN UNIV
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