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Non-destructive repairing method for heavy metal contaminated soil

A technology of polluted soil and remediation method, which is applied in the field of non-destructive remediation of heavy metal-contaminated soil, which can solve the problems of large amount of adsorbent, increased soil remediation cost, and small adsorption capacity, and achieves low processing cost, fast adsorption rate, and high absorption capacity. big effect

Inactive Publication Date: 2016-09-21
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent (201110360190.4) discloses a nano-zero-valent iron-electromagnetic rake repair process for heavy metal-contaminated soil / sludge, which uses zero-valent iron as an adsorbent and combines electromagnetic rake technology to effectively remove heavy metals in the soil, although this method can effectively Remove heavy metals in the soil, but its adsorption amount is small, and the amount of adsorbent added when repairing the soil is large, which greatly increases the cost of soil repair

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] A non-destructive restoration method for heavy metal contaminated soil, comprising the following steps:

[0025] (1) Preparation of adsorbent:

[0026] (a) Dissolve 1 mol of 1,4,7-triazacyclononane-1,4,7-triacetic acid in a biological buffer with a pH of 5.3-5.5, and add 10 mol of catalyst EDC·HCl and 5molNHS, stirred at room temperature for 1.5h to obtain the activated intermediate of the azamacrocyclic carboxylic acid derivative;

[0027] (b) adding Fe to the activation intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains nanoparticles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 8 hours. After the reaction, use a magnet to separate the product and wash it alternately with 0.1mol / L HCl solution, ethanol and water The product was dried several times in vacuum for 10 hours to obtain the adsorbe...

Embodiment 2

[0031] (1) Preparation of adsorbent:

[0032] (a) Dissolve 1 mol of 1,4,7,10,13,16-hexaazacyclooctadecane-1,4,7,10,13,16-hexaacetic acid in a biological buffer with a pH of 5.3-5.5 , under the protection of nitrogen, add 40mol catalyst EDC·HCl and 15molNHS, stir at room temperature for 3h, and obtain the activated intermediate of the azamacrocyclic carboxylic acid derivative;

[0033] (b) adding Fe to the activation intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains nanoparticles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 10 hours. After the reaction, the product is separated with a magnet and washed alternately with 0.1mol / L HCl solution, ethanol and water The product was dried several times in vacuum for 20 hours to obtain the adsorbent;

[0034] (2) Use a rotary tiller to crush a piece of dry s...

Embodiment 3

[0037] (1) Preparation of adsorbent:

[0038] (a) Dissolve 1 mol of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid in a biological buffer solution with a pH of 5.3-5.5, and add 20 mol of Catalyst EDC·HCl and 7mol NHS, stirred at room temperature for 1.8h to obtain the activated intermediate of the azamacrocyclic carboxylic acid derivative;

[0039] (b) adding Fe to the activation intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2In order to protect the shell layer, the shell layer contains nanoparticles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 8.5h. After the reaction, use a magnet to separate the product, and wash it alternately with 0.1mol / L HCl solution, ethanol and water The product was dried several times in vacuum for 12 hours to obtain the adsorbent;

[0040] (2) Use a rotary tiller to crush a piece of dry soil polluted by heavy metals. Th...

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Abstract

The invention discloses a non-destructive repairing method for heavy metal contaminated soil. The method comprises the steps that to-be-treated soil is broken through a rotary cultivator; then, irrigation is conducted, and part of heavy metal fixed in soil is dissolved out; nanometer particles with Fe3O4 as a core and SiO2 as a shell are added into the soil to serve as adsorbent, and nitrogen containing macro-ring carboxylic acid derivate is modified on the edge of the shell of the particles of a core and shell structure; after adsorption treatment, the adsorbent adsorbing the heavy metal is separated out through an electromagnetic harrow device, a buffer solution and carbon microspheres are added in the separated-out soil, stirring and standing are conducted, and supernate is removed; and then, the soil is washed by purified water several times, and the treated soil is obtained. The soil treated through the method is free of secondary contamination, the heavy metal removing rate is high, efficiency is high, and cost is low.

Description

Technical field: [0001] The invention relates to the field of contaminated soil treatment, in particular to a non-destructive restoration method for heavy metal contaminated soil. Background technique: [0002] With the continuous acceleration of my country's industrialization, urbanization, and rural intensification, the problem of soil heavy metal pollution has become increasingly prominent. In the urban environment, industrial and human activities bring a large amount of heavy metals into the urban soil, resulting in the accumulation of these elements in the soil, and directly or indirectly threaten human health through the atmosphere, water body or food chain. Therefore, soil pollution remediation has become an important task in the field of environmental protection. [0003] Chinese patent (201110360190.4) discloses a nano-zero-valent iron-electromagnetic rake repair process for heavy metal-contaminated soil / sludge, which uses zero-valent iron as an adsorbent and combi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
CPCB09C1/02
Inventor 王文庆
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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