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Chemical leaching-electric repairing method for heavy metal contaminated soil

A technology for electric repair and polluted soil, applied in the restoration of polluted soil, etc., can solve the problems of insufficient separation effect of heavy metals, and achieve the effects of saving manpower and material resources, simple and convenient operation, and high removal rate of heavy metals

Inactive Publication Date: 2019-02-01
罗永山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operation is simple and easy, not limited by the site, but the heavy metal separation effect is not enough

Method used

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  • Chemical leaching-electric repairing method for heavy metal contaminated soil
  • Chemical leaching-electric repairing method for heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Close the switchable partition of the electric repair device, and mix xylitol fatty acid ester, 0.1mol / L citric acid, and hydrolyzed maleic anhydride at a mass ratio of 5:2:1 to prepare a rinse agent; The electrolytic tank in the restoration device is used to rinse the soil with a leaching agent, and the mass ratio of the leaching agent to the soil is 1:1;

[0024] (2) Add acetic acid-sodium acetate buffer solution with a pH of 2 to 5 in the anode chamber, add 0.15mol / L potassium nitrate solution in the cathode chamber, connect the direct current between the graphite anode and the graphite cathode, and recover heavy metal ions in the cathode chamber; turn on the electric repair The switchable partition of the device recovers the heavy metal filtrate in the collection tank. After electrolysis, the filtrate can be reused as a washing agent and recover heavy metals at the same time.

Embodiment 2

[0026] (1) Close the switchable partition of the electric repair device, and mix xylitol fatty acid ester, 0.3mol / L tartaric acid, and hydrolyzed maleic anhydride with a mass ratio of 4:2:1 to prepare a rinse agent; The soil is rinsed with a leaching agent in the electrolytic cell in the device, and the mass ratio of the leaching agent to the soil is 1.3:1;

[0027] (2) Add acetic acid-sodium acetate buffer solution with a pH of 2 to 5 in the anode chamber, add 1.3mol / L potassium nitrate solution in the cathode chamber, connect the direct current between the graphite anode and the graphite cathode, and recover heavy metal ions in the cathode chamber; turn on the electric repair The switchable partition of the device recovers the heavy metal filtrate in the collection tank. After electrolysis, the filtrate can be reused as a washing agent and recover heavy metals at the same time.

Embodiment 3

[0029] (1) Close the switchable partition of the electric repair device, and mix xylitol fatty acid ester, 0.4mol / L sodium gluconate, and hydrolyzed maleic anhydride at a mass ratio of 6:2:1 to prepare a leaching agent; In the electrolytic cell of the electric repair device, the soil is rinsed with a leaching agent, and the mass ratio of the leaching agent to the soil is 1.2:1;

[0030] (2) Add acetic acid-sodium acetate buffer solution with a pH of 2 to 5 in the anode chamber, add 0.08mol / L potassium nitrate solution in the cathode chamber, connect the direct current between the graphite anode and the graphite cathode, and recover heavy metal ions in the cathode chamber; turn on the electric repair The switchable partition of the device recovers the heavy metal filtrate in the collection tank. After electrolysis, the filtrate can be reused as a washing agent and recover heavy metals at the same time.

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Abstract

The invention discloses a chemical leaching-electric repairing method for heavy metal contaminated soil. The method includes the steps that xylitol aliphatic ester, natural organi acid and hydrolyzedmaleic anhydride with the mass ratio being (3-6):2:1 are mixed to prepare a leaching agent; the leaching agent is used for leaching soil in an electrolytic groove in an electric repairing device, wherein the mass ratio of the leaching agent and the soil is (1-1.3):1; an acetic acid-natrium aceticum buffering solution with the pH being 2-5 is added into an anode chamber, 0.05 mol / L-2 mol / L of a potassium nitrate solution is added into the anode chamber, direct currents of a graphite anode and a graphite cathode are connected, and heavy metal ions are recycled in the anode chamber; and heavy metal filter liquid is recycled in a collecting groove, after the heavy metal filter liquid is electrolyzed, a filtrate can be repeatedly used as a leaching agent, and meanwhile the heavy metal is recycled. By means of the method, the effect of repairing heavy metal contaminated soil is good, the repairing speed is high, consumed time is short, the method is simple and fast, reagents for use are safeand non-toxic, secondary pollution to the environment is avoided, the heavy metal can also be recycled, and the requirements for sustainable development, energy conservation and environment friendliness are met.

Description

technical field [0001] The invention relates to the technical field of heavy metal soil restoration, in particular to a chemical leaching-electric restoration method for heavy metal contaminated soil. Background technique [0002] The main sources of soil heavy metal pollution are the use of pesticides, industrial sewage, waste discharge, domestic garbage, and atmospheric deposition. The heavy metals that pollute the soil mainly include mercury, cadmium, lead, chromium and arsenic and other elements with significant biological toxicity. Excessive heavy metal content will cause great harm to the environment, animals and plants, such as affecting the development of plant roots and leaves, and damaging the human nervous system. , immune system, skeletal system, etc. [0003] Commonly used soil heavy metal remediation techniques include guest-soil method, biological remediation method, chemical remediation method, electrodynamic remediation method, etc. Several remediation met...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/085B09C1/02B09C1/08
Inventor 罗永山
Owner 罗永山
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