A method for repairing heavy metal polluted soil

A technology for contaminated soil and heavy metals, applied in the restoration of contaminated soil, etc., can solve the problems of difficult to guarantee the quality of restoration, limited by environmental conditions, high energy consumption of physical restoration, etc., and achieve environmental protection, high selectivity and unique properties in the preparation process Effect

Inactive Publication Date: 2016-06-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the remediation technologies for heavy metals in soil mainly focus on physical remediation, biotechnology, chemical remediation, etc., while physical remediation consumes a lot of energy and the processing process is complicated; the limitation of biological remediation is that the remediation speed is slow, limited by environmental conditions, and the remediation quality is difficult to guarantee; Traditional chemical stabilizer precipitation repair technology will cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the farmland soil near an industrial area in Foshan City, the samples were mainly polluted by Pb, Cr, Cu and other heavy metals with high content. Take 3.00g of soil, put it into 100ml of 0.5%wt acrylic acid modified chitosan restoration agent aqueous solution, stir continuously for 8h, let stand, and filter. Measure the contents of three heavy metals Pb, Cr, and Cu before and after the soil treatment with the total decomposition method. Before the treatment, the contents of Pb, Cr, and Cu are respectively 504, 213, and 80.1mg / kg, and the contents after the treatment are respectively 34.1, 78.1, 33.5mg / kg, which are all lower than the upper limit of the first-level standard for Pb, Cr, and Cu content in farmland soil (GB15618-1995) 35, 90, and 35mg / kg.

Embodiment 2

[0027] The farmland soil near a tannery in Guangzhou City, the samples were mainly polluted by Pb, Cr, Cu and other heavy metals with high content. Take 10.00g of soil, put it into 200ml 1%wt acrylic acid modified chitosan restoration agent aqueous solution, stir continuously for 0.5h, let stand, and filter. Measure the contents of three heavy metals Pb, Cr, and Cu before and after soil treatment by the total decomposition method. 31.5mg / kg, which are all lower than the upper limit of the first-level standard for Pb, Cr, and Cu content in farmland soil (GB15618-1995) 35, 90, and 35mg / kg.

Embodiment 3

[0029] In the farmland soil near an electroplating factory in Dongguan City, the samples were mainly polluted by Pb, Cr, Cu and other heavy metals with high content. Take 6.00g of soil, put it into 150ml of 0.2%wt acrylic acid modified chitosan restoration agent aqueous solution, stir continuously for 3h, let stand, and filter. The content of the three heavy metals Pb, Cr, and Cu before and after the soil treatment was measured by the total decomposition method. The contents of Pb, Cr, and Cu before the treatment were 257, 433, and 108 mg / kg respectively, and the contents after the treatment were 31.8, 88.7, and 34.9 mg / kg respectively. mg / kg, all of which are lower than the upper limits of the primary standard for Pb, Cr, and Cu content in farmland soil (GB15618-1995) 35, 90, and 35 mg / kg.

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Abstract

The invention discloses a method for repairing heavy metal-contaminated soil. The method comprises: using acrylic acid modified chitosan as a repairing agent, placing the polluted soil in an aqueous repairing agent solution for stirring and eluting, or applying the aqueous repairing agent to Plow and harrow the paddy fields to be plowed to transfer the heavy metals from the contaminated soil to the eluate, so as to realize the remediation of heavy metal (Pb, Cr, Cu) contaminated soil. Acrylic acid-modified chitosan, a repairing agent, is prepared by Michael reaction between chitosan and acrylic acid. It has the advantages of environmental protection, non-toxic, harmless, biodegradable, no secondary pollution, and rich sources of raw materials. The remediation agent has a good remediation effect on soil polluted by heavy metals, and the heavy metal content of the remediation soil reaches the first-class standard of farmland land. The chitosan derivative restoration agent adopted in the method is environmentally friendly, has good water solubility, and has a strong ability to chelate heavy metals.

Description

technical field [0001] The invention relates to an environmentally friendly and low-cost method for remediating heavy metal-contaminated soil, in particular to a method for remediating heavy metal-contaminated soil. Background technique [0002] After farmland soil is polluted by heavy metals, it will affect the growth of plants. The overall growth of plants will become poor, the root system will be stunted, the growth of aboveground parts will be short, the leaves will be discolored and deformed, and the fruits will be deformed. Finally, the yield and quality of agricultural products will decline. Moreover, heavy metals such as lead, manganese, copper, mercury, and cadmium enter the human body through the food chain and are also difficult to remove. They have a long metabolic cycle in the human body and cause great damage to human health. They mainly accumulate in major organs of the human body and disrupt normal physiological metabolism. Low doses of these pollutants can d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 葛华才武娜娜叶铭添郑敏姗周焯斌黎晓阳
Owner SOUTH CHINA UNIV OF TECH
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