Method for remediating heavy metal contaminated soil through combination of microorganism and plant

A technology of polluted soil and joint restoration, applied in the field of polluted soil treatment, can solve the problems of slow effect, limited application, insignificant effect, etc., and achieve the effect of reducing accumulation, high added value and increasing income

Active Publication Date: 2015-12-16
YUNNAN JICHENG LANDSCAPE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid the risk of exposure to the human body, in recent years, more and more attention has been paid to the research on non-edible economic crops for phytoremediation. Coupled with the limitation of climate and soil environment, the accumulation of heavy metals in these plants is limited, which limits their application

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  • Method for remediating heavy metal contaminated soil through combination of microorganism and plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for jointly repairing heavy metal-contaminated soil by microorganisms and plants, comprising the following steps:

[0040] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the soil with a thickness of 15 cm on the surface of heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 9.0×10 per square meter of heavy metal-contaminated soil. 9 A magnetotactic bacterium was cultivated for 30 days;

[0041] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil in a flooded state, and set a energized coil on the heavy-metal-contaminated soil to generate a magnetic field. The direction of the magnetic field is away from the ground and upward. sky;

[0042] 3) Collect the soil with a thickness of 9 cm on the surface of the heavy metal-contaminated soil in step 3);

[0043] 4) Rinse the heavy metal-contaminated soil collected in step 4) with water, repeat 3 ti...

Embodiment 2

[0050] A method for jointly repairing heavy metal-contaminated soil by microorganisms and plants, comprising the following steps:

[0051] 1) Mix the magnetotactic bacteria cultivated above with the soil with a thickness of 17 cm on the surface of the heavy metal-contaminated soil, and the addition ratio of the magnetotactic bacteria is 9.5×10 per square meter of heavy metal-contaminated soil. 9 A magnetotactic bacterium was cultivated for 33 days;

[0052] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil in a flooded state, and set a energized coil on the heavy-metal-contaminated soil to generate a magnetic field. The direction of the magnetic field is away from the ground and upward. sky;

[0053] 3) Collect the soil with a surface layer thickness of 10cm of the heavy metal-contaminated soil in step 3);

[0054] 4) Rinse the heavy metal-contaminated soil collected in step 4) with water, repeat twice, ...

Embodiment 3

[0061] A method for jointly repairing heavy metal-contaminated soil by microorganisms and plants, comprising the following steps:

[0062] 1) Mix the magnetotactic bacteria cultivated above with the soil with a thickness of 18 cm on the surface of the heavy metal-contaminated soil, and the addition ratio of the magnetotactic bacteria is 1.0×10 per square meter of heavy metal-contaminated soil. 10 A magnetotactic bacterium was cultivated for 35 days;

[0063] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil in a flooded state, and set a energized coil on the heavy-metal-contaminated soil to generate a magnetic field. The direction of the magnetic field is away from the ground and upward. sky;

[0064] 3) Collect the heavy metal-contaminated soil surface layer with a thickness of 12cm in step 3);

[0065] 4) Rinse the heavy metal-contaminated soil collected in step 4) with water, repeat 4 times, then fill...

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Abstract

The invention provides a method for remediating heavy metal contaminated soil through combination of a microorganism and a plant. The method comprises the following steps: mixing a magnetotactic bacterium with the heavy metal contaminated soil, irrigating the heavy metal contaminated soil mixed with the magnetotactic bacterium, arranging a magnetic field on the heavy metal contaminated soil, collecting the heavy metal contaminated soil containing the magnetotactic bacterium, washing out the heavy metal contaminated soil, and conducting backfilling on the heavy metal contaminated soil; planting copper weeds in the heavy metal contaminated soil preliminarily remediated by the magnetotactic bacterium, and removing all the copper weeds after 10-12 months; and circularly repeating the steps till the content of heavy metal in soil is up to the safety standard. The method has the advantages that the treatment effect on the heavy metal contaminated soil is good, the operation is simple, the cost is low, heavy metal ions are directly removed, secondary contamination of soil is avoided, and the practicability is strong; moreover, the method is suitable for treating large-area contaminated soil.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a method for jointly repairing heavy metal-contaminated soil by microorganisms and plants. Background technique [0002] Soil is not only an important part of the earth's ecological circle, but also one of the important natural resources that human beings rely on for survival. With the development of industrial activities such as mineral mining and smelting, and agricultural activities such as sewage irrigation, application of sludge and low-quality chemical fertilizers, harmful heavy metals such as Cd and Pb continue to enter the soil environment, causing pollution to normal production and life. Therefore, the control of soil heavy metal pollution is of great significance to the ecological civilization and the healthy life of human beings. [0003] The traditional remediation methods for soil heavy metal pollution are usually physical and chemical methods, such as dil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 马新攀
Owner YUNNAN JICHENG LANDSCAPE TECH CO LTD
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