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Mechanochemical reduction remediation method for hexavalent chromium polluted soil

A technology of mechanochemistry and remediation methods, which is applied in the restoration of polluted soil and other directions to achieve the effect of enhancing stability

Active Publication Date: 2017-10-27
SHANGHAI SECOND POLYTECHNIC UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to make up for and solve the deficiencies of the existing technology for treating hexavalent chromium-contaminated soil, the object of the present invention is to provide a method for mechanochemical reduction treatment of hexavalent chromium-contaminated soil

Method used

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  • Mechanochemical reduction remediation method for hexavalent chromium polluted soil

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Experimental program
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Effect test

Embodiment 1

[0020] After mixing 10g of contaminated soil (the content of hexavalent chromium in the original soil sample is 2360 mg / kg, according to GB 5085.3-2007, the leaching concentration of hexavalent chromium is 22.58 mg / L) with 0.2g of ferrous sulfate and 0.1g of calcium polysulfide Add it into the planetary ball mill tank, and then add zirconia grinding balls to the ball mill tank, wherein the mass ratio of material to grinding balls is 1:9. The operating conditions of the ball mill are set as follows: the ball milling speed is 500 rpm, the ball milling time is 2 hours, the ball milling method is 15 minutes, and the interval is 15 minutes, and the cycle is carried out sequentially. After the mechanochemical reaction, samples were taken for toxicity leaching experiments, and the leaching concentration of hexavalent chromium in the leach solution was measured.

[0021] After analysis, the concentration of hexavalent chromium in the leachate was 0.92 mg / L, which was lower than the st...

Embodiment 2

[0023] Mix 10g of contaminated soil (the content of hexavalent chromium in the original soil sample is 2360 mg / kg, and the leaching concentration of hexavalent chromium is 22.58 mg / L according to GB 5085.3-2007) and 0.3 g of ferrous sulfate are added to the tank of the planetary ball mill , and then add zirconia grinding balls to the ball mill jar, wherein the mass ratio of the material to the grinding balls is 1:9. The operating conditions of the ball mill are set as follows: the ball milling speed is 600 rpm, the ball milling time is 2 hours, the ball milling method is 15 minutes, and the interval is 15 minutes, and the cycle is carried out sequentially. After the mechanochemical reaction, samples were taken for toxicity leaching experiments, and the leaching concentration of hexavalent chromium in the leaching solution was measured.

[0024] After analysis, the concentration of hexavalent chromium in the leachate was 0.38 mg / L, which was lower than the standard value for le...

Embodiment 3

[0026] Mix 10g of contaminated soil (the content of hexavalent chromium in the original soil sample is 2360 mg / kg, and the leaching concentration of hexavalent chromium is 22.58 mg / L according to GB 5085.3-2007) and 0.3 g of calcium polysulfide are added to the tank of the planetary ball mill , and then add zirconia grinding balls to the ball mill jar, wherein the mass ratio of the material to the grinding balls is 1:9. The operating conditions of the ball mill are set as follows: the ball milling speed is 500 rpm, the ball milling time is 2 hours, the ball milling method is 15 minutes, and the interval is 15 minutes, and the cycle is carried out sequentially. After the mechanochemical reaction, samples were taken for toxicity leaching experiments, and the leaching concentration of hexavalent chromium in the leach solution was measured.

[0027] After analysis, the concentration of hexavalent chromium in the leachate was 0.51 mg / L, which was lower than the identification stand...

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Abstract

The invention belongs to the technical field of heavy metal polluted soil treatment and in particular relates to a mechanochemical reduction remediation method for hexavalent chromium polluted soil. The method disclosed by the invention comprises the following steps: grinding naturally aired hexavalent chromium polluted soil in a mortar, sieving, carrying out a mechanochemical reaction on the sieved soil particles, reducing agents (such as ferrous sulfate, calcium polysulfides and the like) and zirconia in a ball mill tank according to a ratio, and transforming hexavalent chromium with high toxicity, easiness in migration and high bio-availability into trivalent chromium with low toxicity, easiness in precipitation and low bio-availability by virtue of mechanochemical reduction, thereby realizing harmless treatment of the hexavalent chromium polluted soil. The method disclosed by the invention has the characteristics of being high-efficiency, green and zero in secondary pollution and is a hexavalent chromium polluted soil remediation method with excellent application prospects.

Description

technical field [0001] The invention belongs to the technical field of heavy metal polluted soil treatment, in particular to a mechanochemical reduction repair method for hexavalent chromium polluted soil. Background technique [0002] With the rapid advancement of human industrialization, the chromium content in many industrial legacy sites has seriously exceeded the standard, and has seriously affected and threatened human health and the sustainable development of the environment. The two oxidation states of chromium in soil are trivalent chromium Cr(III) and hexavalent chromium Cr(VI), among which hexavalent chromium, which is highly toxic, easy to migrate and bioavailable, is the most harmful. Due to the easy migration of hexavalent chromium, hexavalent chromium will not only expand the scope of pollution, but also pollute surface water and groundwater; in addition, although under normal physiological conditions, hexavalent chromium will not react with DNA, but hexavalen...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 苑文仪许维通李培中王景伟张承龙白建峰朱学峰王晓岩王临才
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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