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Method for restoring copper-polluted soil by plants

A technology of phytoremediation and copper pollution, applied in the field of phytoremediation, to achieve the effect of protecting water and soil, widely distributed, and not damaging the ecological environment

Inactive Publication Date: 2012-06-27
DAQIAN ECOLOGY & LANDSCAPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the method of remediating copper-contaminated soil by using Commelina

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] (1) Cut off the stems of the commelina plants, and propagate them on the cutting bed at a plant and row spacing of 5×10 cm, and keep the soil moist after cutting.

[0025] (2) Level the plot in the copper-contaminated area and create planting holes with a depth of 5-10 cm, a plant-to-plant spacing of 5-10 cm, and a row spacing of 10-15 cm.

[0026] (3) Commelina is rooted on the cutting bed, and the seedlings are planted in copper-containing soil, and the fertilizer and water management is carried out, watering once every 2-3 days, fertilizing once every 10-15 days, and shading cultivation with sunshade nets in summer;

[0027] (4) After the commelina seedlings grow in copper-containing soil for 4 months, they are harvested once, and the 3-5 cm aboveground stems are reserved as stubble, and all the roots are uprooted after the stubble grows for 4 months;

[0028] (5) Dry and crush the harvested aerial parts or whole plants, and then recycle copper to prevent environment...

Embodiment 1

[0030] This embodiment is the application of Commelina chinensis in repairing copper pollution in mine soil, and the specific methods are as follows:

[0031] In the soil polluted by heavy metals in the copper mining area, the land is leveled, and the seedlings of Commelina officinalis cutting propagation are planted in the copper-containing soil according to the above-mentioned specific implementation method. After the seedlings grow in the copper-containing soil for 4 months, they are harvested once and measured. The copper content in the aboveground part is 812mg / kg; 3-5cm of the aboveground stems are reserved as the base stubble, and all the roots are uprooted after the stubble grows for 4 months. The measured copper content in the aboveground part is 1026mg / kg.

Embodiment 2

[0033] This embodiment is the application of commelina in repairing industrial copper-contaminated soil, and the specific methods are:

[0034] In the flat plot of the industrial copper-polluted area, the seedlings of Commelina officinalis cutting propagation were planted in the copper-containing soil according to the above-mentioned specific implementation method. After the seedlings grew in the copper-containing soil for 4 months, they were harvested once, and the copper content of the above-ground part was measured. The copper content is 731mg / kg; 3-5cm of the aboveground stems are reserved as the base stubble, and all the roots are uprooted after the stubble has grown for 4 months. The measured copper content in the aboveground part is 827mg / kg.

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Abstract

The invention discloses a method for restoring copper-polluted soil by plants. The method provided by the invention is characterized in that dayflower seedlings subjected to cutting propagation are planted in copper-containing soil, grow and are harvested or are pulled up during harvest time; and copper is recovered. Concretely, the method comprises the following steps of 1, cutting off stems of dayflower plants, carrying out cutting propagation of the stems by a cutting bed according to plant and row distances of 5cm*10cm, and keeping soil moist after cutting, 2, flattening a sample area in copper-polluted zone, and digging planting holes, 3, planting dayflower seedlings rooting in the cutting bed in copper-containing soil, 4, harvesting overground parts of the dayflower seedlings or pulling up the whole dayflower seedlings with roots, and 5, drying and crushing the harvested overground parts of the dayflower seedlings or the whole dayflower seedlings with roots, and carrying out copper recovery. The method provided by the invention has the advantages of low cost, high restoration efficiency and low environmental risk, and can be utilized for restoration of copper-polluted soil in industry and agriculture and for reconstruction of ecological vegetation in a mine tailing area.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of polluted soil, in particular to a copper-enriching plant—commelina ( Commelina communis L.) Method for removing soil copper pollution. Background technique [0002] In recent years, with the rapid development of industrial and agricultural production, heavy metal pollution in the environment has become increasingly serious. The mining of copper-containing minerals, the discharge of three wastes from smelters, the long-term and large-scale use of copper-containing fungicides and the composting of municipal sludge have made the copper content of the soil several times or even dozens of times that of the original soil, which is far beyond the soil environment. [0003] It will cause harm to plants, animals and soil microorganisms, and seriously threaten the stability of the ecosystem and human safety. Therefore, the pollution of copper in soil has gradually attracted people's attention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 李月刚陈俊华柯亮
Owner DAQIAN ECOLOGY & LANDSCAPE
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