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Cadmium-polluted soil restoration method

A technology of cadmium-contaminated soil and restoration method, which is applied in the restoration of polluted soil and other directions, can solve the problems of limited cadmium enrichment capacity, etc., and achieves the effects of short restoration time, high restoration efficiency, and enhanced absorption and transfer.

Inactive Publication Date: 2016-09-28
SICHUAN AGRI UNIV
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  • Abstract
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Problems solved by technology

Although this method can reduce the content of cadmium in soil, its ability to enrich cadmium is limited and needs to be further improved.

Method used

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  • Cadmium-polluted soil restoration method
  • Cadmium-polluted soil restoration method
  • Cadmium-polluted soil restoration method

Examples

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Embodiment

[0019] Use potted plants to simulate heavy metal pollution in soil. Beginning in autumn (early September), air-dry, crush and sieve the soil from surrounding farmlands that are not polluted by heavy metals, and put them in pots. The pot size is 14×23cm (height×diameter), and each pot is filled with 3kg of soil , applying CdCl as a solution according to the treatment design with cadmium content of 5, 25 and 50 mg / kg 2 ﹒ 2.5H 2 O (cadmium chloride, analytically pure) was used to prepare cadmium-contaminated soil. After balancing for 4 weeks, transplant the Achyranthes genus Achyranthes (Latin name Galinsogaparviflora Cav.) seedlings (two pairs of true leaves) growing in autumn and winter. The chrysanthemum seeds of the farmland (unpolluted area) were cultivated in a laboratory light-temperature incubator. The test set 5, 25 and 50mg / kg total of 3 cadmium concentration levels, and 3 treatments were set in each cadmium concentration, which were respectively no application (CK),...

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Abstract

The invention provides a method for repairing cadmium-contaminated soil, comprising: planting Achyranthes chrysanthemum in the cadmium-contaminated soil, and spraying 1-2 mmol / kg EDDS into the soil after the chrysanthemum is grown to the initial flowering stage, and the chrysanthemum continues to grow After the full flowering period, harvest the aerial part of Achyranthes chrysanthemum. The present invention applies EDDS to the soil after the initial flowering stage of Achyranthes chrysanthemum, which can enhance the absorption and transfer of cadmium in the soil by Achyranthes chrysanthemum, thereby effectively removing the heavy metal cadmium in the soil and realizing the restoration of the soil, and the restoration efficiency is higher than that of cattle. Chrysanthemum chrysanthemum alone and chrysanthemum combined with EDTA will not cause toxicity to chrysanthemum. At the same time, the method provided by the invention has a shorter restoration time and can remove the heavy metal cadmium in the soil in a short time. In addition, the method provided by the invention will not cause EDDS to remain in the soil, and will not form secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating cadmium-contaminated soil. Background technique [0002] At present, mining, smelting, electroplating, pesticide abuse and sewage irrigation will cause a large amount of heavy metals to enter the ecosystem, especially the soil, seriously threatening the ecological environment and human health. Therefore, it is extremely necessary to remediate heavy metal-contaminated soil and reduce the impact of heavy metals on ecosystems. Traditional remediation methods include in-situ vitrification, guest soil method, soil leaching method, etc., which have problems such as high cost, irreversible change of soil physical and chemical properties, and secondary pollution. Phytoextraction remediation is a novel, green and environment-friendly method for remediation of heavy metal-contaminated soil. [0003] Phytoremediation is the main and most effec...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/105B09C1/08B09C2101/00
Inventor 朱雪梅邵继荣廖爽杨远祥杨占彪王应军程章徐小逊孙岗
Owner SICHUAN AGRI UNIV
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