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Method for removing lead from heavy metal soil leacheate

A technology for eluent and heavy metals, which is applied in the restoration of polluted soil and other directions, can solve the problems of harsh conditions used by electrolysis, inability to treat eluent, and complicated chemical operation process, and achieve good treatment effect.

Inactive Publication Date: 2012-01-25
GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conditions of the electrolysis method are harsh and the operation cost is high. The photocatalytic oxidation method is suitable for treating a small amount of eluent with low concentration of heavy metals. repair eluent for processing

Method used

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  • Method for removing lead from heavy metal soil leacheate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The contaminated soil was collected from a lead mine in Inner Mongolia. Weigh 1.5g of the soil into a centrifuge tube, add 25ml of 0.1mM EDTA into the tube, shake for 4 hours and then centrifuge to get the supernatant. The lead content in the supernatant was 8.93 mg / L, adjusted the pH to 3.5 with nitric acid, added 50 mg of nano-iron powder and oscillated for 1 hour, then centrifuged to remove the supernatant, the measured lead content in the solution was reduced to 2.64 mg / L, and the removal rate reached 70.44%.

Embodiment 2

[0023] The contaminated soil was collected from a lead-polluted site in Henan. Weigh 1.5g of the soil into a centrifuge tube, add 25ml of 0.5mM EDTA into the tube, shake for 4 hours and then centrifuge to get the supernatant. The lead content in the supernatant was 17.65 mg / L, adjusted the pH to 2.0 with hydrochloric acid, added 100 mg of nano-iron powder and oscillated for 1 hour, then centrifuged to extract the supernatant, the measured lead content in the solution was reduced to 4.86 mg / L, and the removal rate reached 72.46 %.

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Abstract

The invention provides a method for removing lead from heavy metal polluted soil leacheate. The method comprises the following steps of: adjusting the pH of the heavy metal polluted soil leacheate to 2.0-3.5; adding nano iron powder; shaking; and removing lead from the heavy metal polluted soil leacheate. By applying the method provided by the invention, over 70 percent of lead can be removed from the heavy metal polluted soil leacheate.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a method for treating the eluate used for remediating polluted soil by chemical leaching. Background technique [0002] Heavy metal contaminated soil remediation technology can be divided into physical remediation technology, chemical remediation technology, phytoremediation technology and microbial remediation technology according to different remediation principles. [0003] Physical remediation techniques include soil improvement, electric remediation, heat treatment and cleaning methods. These methods are suitable for the treatment of small and lightly polluted soils. However, for soils with large polluted areas and heavily polluted soils, a lot of manpower and financial resources are required. And it is easy to lead to the destruction of soil structure, the decline of soil fertility and secondary pollution. Chemical remediation technolog...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 崔岩山付彧
Owner GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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