Method for repairing cadmium polluted soil by compositae plants

A technology for cadmium-contaminated soil and Compositae plants is applied in the field of remediation of cadmium-contaminated soil by using Compositae plants, which can solve the problems of soil structure damage, large amount of engineering, secondary pollution, etc., and achieves stable polluted soil, little environmental disturbance, and no environmental disturbance. The effect of secondary pollution

Inactive Publication Date: 2012-01-11
HUAINAN MINING IND GRP +1
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  • Application Information

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Problems solved by technology

[0003] However, the above-mentioned physical and chemical remediation techniques require a large amount of engineering, complex operati

Method used

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  • Method for repairing cadmium polluted soil by compositae plants
  • Method for repairing cadmium polluted soil by compositae plants
  • Method for repairing cadmium polluted soil by compositae plants

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0033] Experimental example 1: Remediation of single cadmium-contaminated soil by using annual canopy

[0034] A preliminary systematic study was carried out on the cadmium accumulation ability of the one-year canopy by using the method of pot plant simulation experiment.

[0035] The soil samples were collected from the cultivated layer (0-20cm) of normal farmland in Huainan City. The soil type is yellow brown soil, which is not polluted by heavy metals (Cd content is 0.085mg / kg). The soil used for the experiment was naturally air-dried, crushed, and impurities were removed, passed through a 2mm sieve, and put into a plastic pot (20cm (diameter)×15cm (height)). Analytical pure CdCl 2 2.5H 2 O was added to the soil in solid form, and the concentrations of cadmium were 0, 10, 25, 50, and 100 mg / kg (based on the weight of dried soil). Mix well after adding, and adjust the soil water content to keep it at about 70-80% of the field water holding capacity. After balancing for t...

experiment example 2

[0042] Experimental example 2: Remediation of complex cadmium-contaminated soil by using annual canopy

[0043] Soil samples were collected from the cultivated layer (0-20 cm) of normal farmland in Huainan City. The soil was yellow-brown soil and was not polluted by heavy metals such as cadmium, copper, zinc, lead, and nickel (the content of Cd was 0.085 mg / kg, and the content of Cu was 27.57mg / kg, Zn content is 89.15mg / kg, Pb content is 22.21mg / kg, Ni content is 26.67mg / kg). The soil used for the experiment was naturally air-dried, crushed, and impurities were removed, passed through a 2mm sieve, and put into a plastic pot (20cm (diameter)×15cm (height)). Analytical pure CdCl 2 2.5H 2 O, CuSO 4 ·5H 2 O, ZnSO 4 ·7H 2 O, NiSO 4 ·6H 2 O was added to the soil in solid form, and the concentrations of Cd, Cu, Zn, Pb, and Ni in the combined pollution treatment were 10, 400, 1000, 500, and 400 mg / kg (based on the weight of dried soil), equivalent to 10, 1, 2, 1, and 2 times ...

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Abstract

The invention provides a method for repairing cadmium polluted soil by compositae plants, which comprises the following steps of: planting erigeron annuus in the cadmium polluted soil so as to greatly adsorb cadmium in the cadmium polluted soil by root systems of the erigeron annuus and transfer the cadmium to the part of the erigeron annuus above the ground; and when the erigeron annuus grows to the mature period, integrally moving away the erigeron annuus from the cadmium polluted soil so as to remove cadmium pollution in the soil. In the method, the erigeron annuus is used to carry out plant repair on the cadmium polluted soil, the perturbation to the environment is low, the physicochemical property of the soil is not damaged, the polluted soil can be stabilized, the wind erosion and the water erosion of the heavy metal polluted soil are reduced and the secondary pollution is not caused. Moreover, the erigeron annuus has strong adaptability and low requirement on a field management technology, is convenient for the field management and can take the effect of beautifying the environment when the polluted soil is repaired. Therefore, the low cost and a good repair effect are realized and the cadmium polluted soil is repaired without secondary pollution.

Description

technical field [0001] The invention relates to the technical fields of agriculture and environmental protection, in particular to a method for repairing cadmium-contaminated soil by using Compositae plants. Background technique [0002] Soil heavy metal pollution comes from a wide range of sources, mainly including: atmospheric dustfall, sewage irrigation, improper disposal of industrial solid waste, mining activities, pesticides and fertilizers, etc. Existing technologies for remediating heavy metal-contaminated soil include physical remediation and chemical remediation. Physical restoration technology mainly repairs soil through soil improvement method, vitrification method, electrodynamic method and thermal desorption method. Chemical restoration technology mainly includes chemical curing method, chemical leaching method, in-situ permeable reactive barrier method (Permeable Reactive Barrier), etc., mainly by adding curing agents, organic matter, chemical reagents, natur...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 程功林江德开李守勤赵玲陈永春张治国陈萍姚多喜刘锦
Owner HUAINAN MINING IND GRP
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