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Cathode acidifying electric power repairing process for heavy metal contaminated soil

A technology of polluted soil and remediation method, which is applied in the field of cathodic acidification electrodynamic remediation process, can solve the problems of long remediation time, high operation cost, low remediation efficiency, etc., and achieves the effect of increasing the concentration of heavy metal ions and improving the mobility.

Inactive Publication Date: 2007-08-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a cathodic acidification electrodynamic repair method for polluted soil in view of the problems existing in the prior art such as long repair time, high operating cost, and low repair efficiency, so as to achieve a shorter repair period and With lower operating costs, the removal rate of heavy metals in polluted soils can be improved. This method is especially suitable for the removal of heavy metals in dense and low hydraulic permeability soils.

Method used

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  • Cathode acidifying electric power repairing process for heavy metal contaminated soil
  • Cathode acidifying electric power repairing process for heavy metal contaminated soil
  • Cathode acidifying electric power repairing process for heavy metal contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1), the polluted soil containing cadmium 1490mg / kg is naturally air-dried, and after impurities are removed, particles larger than 2mm are removed by sieving, and the part with a particle size of less than 2mm is used for further use.

[0031] (2), according to soil: water (mass ratio) = 2: 1, deionized water is added in the soil, and mud will be mechanically stirred with electric mixer for 3 hours, then stand still for 7 days to reach the balanced distribution of pollutants.

[0032] (3), the soil chamber 10 (height is flush with overflow hole height, is 10cm) of the soil after the treatment is packed into restoration device, separates soil and electrolyte with filter paper 9, and filter paper is fixed with support 12. 600mL 0.0025mol / L H 2 SO 4 The anolyte 3 is injected into the anolyte chamber 5, and 900mL 0.25mol / L H 2 SO 4 The catholyte 4 was injected into the catholyte chamber 6 and then left to stand for 1 hour.

[0033] (4) Apply direct current to the repai...

Embodiment 2

[0037] (1), the polluted soil containing lead 1610mg / kg is naturally air-dried, and after impurities are removed, the particles larger than 2mm are removed by sieving, and the part with a particle size of less than 2mm is used for further use.

[0038] (2), according to soil: water (mass ratio) = 1.8: 1, deionized water is added in the soil, and mud will be mechanically stirred with electric mixer for 4 hours, then stand still for 8 days to reach the balanced distribution of pollutants.

[0039] (3), with (3) in embodiment 1.

[0040] (4) Apply direct current to the repair device with a current density of 0.4mA / cm 2, to promote the regeneration of the electrode reaction, the H generated in the positive electrolysis reaction + The adsorbed lead in the soil is continuously desorbed and migrates to the cathode under the action of the electric field.

[0041] (5), the electrolyte in the electrolyte storage chambers 7 and 8 of each pole is input into the electrolysis chambers 5 a...

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Abstract

The cathode acidifying and electrical power repairing process for heavy metal contaminated soil includes the main steps of: adding ion water into naturally dried and decontaminated soil, stirring and letting stand; filling the contaminated soil to be treated into soil chamber in the electrical power repairing apparatus; filling electrolyte to the electrolyzing rooms and letting stand; and applying constant DC current to desorb heavy metals from the soil, separate heavy metals electrically from the soil and decontaminate the soil. The present invention has the features of short repair time, high heavy metal eliminating rate, etc.

Description

technical field [0001] The invention relates to a restoration process of heavy metal polluted soil, in particular to a cathodic acidification electrodynamic restoration process of heavy metal polluted soil. Background technique [0002] Heavy metal compound pollution in soil caused by sewage irrigation and other human activities has greatly threatened the farmland ecosystem and human health. At present, the treatment methods adopted at home and abroad can be summarized into three categories: the first category is biological methods, such as phytoremediation and microbial remediation; the second category is physical methods, such as guest soil method, soil replacement method, etc.; The third category is chemical methods, such as chemical fixation, chemical leaching, etc. These existing repair methods have certain limitations: [0003] (1) Phytoremediation: The restoration process is slow and has certain requirements for natural and artificial conditions such as soil fertili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 刘云国李程峰曾光明李欣
Owner HUNAN UNIV