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A combined method of magnetotactic bacteria and Chlorophytum remediation of heavy metal-contaminated soil

A technology of contaminated soil and magnetotactic bacteria, applied in the field of contaminated soil treatment, can solve the problems of limited accumulation of heavy metals in plants, unstable repair effect, and insignificant effect, and achieve good soil treatment effect, strong practicability, and easy management Effect

Inactive Publication Date: 2018-06-26
贵州万通环保工程有限公司
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  • Summary
  • 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

Method used

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  • A combined method of magnetotactic bacteria and Chlorophytum remediation of heavy metal-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for jointly repairing heavy metal-contaminated soil by magnetotactic bacteria and spider plants, comprising the following steps:

[0039] 1) Evenly mix the magnetotactic bacteria cultivated above with the 18cm thick soil 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;

[0040] 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 form a magnetic field. The direction of the magnetic field is away from the ground and upward. sky;

[0041] 3) Collection step 3) Surface heavy metal polluted soil, the thickness of collected heavy metal polluted soil is 6cm;

[0042] 4) Rinse the heavy metal-contaminated soil collected in step 4) with tap wate...

Embodiment 2

[0049] A method for jointly repairing heavy metal-contaminated soil by magnetotactic bacteria and spider plants, comprising the following steps:

[0050] 1) Evenly mix the magnetotactic bacteria cultivated above with 15 cm thick soil on the surface of the heavy metal-contaminated soil, and the addition ratio of the magnetotactic bacteria is 9.0×10 per square meter of heavy metal-contaminated soil. 9 A magnetotactic bacterium was cultivated for 30 days;

[0051] 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 form a magnetic field. The direction of the magnetic field is away from the ground and upward. sky;

[0052] 3) Collection step 3) Heavy metal-contaminated soil on the surface, the thickness of the collected heavy metal-contaminated soil is 9cm;

[0053] 4) Rinse the heavy metal-contaminated soil collected in step ...

Embodiment 3

[0060] A method for jointly repairing heavy metal-contaminated soil by magnetotactic bacteria and spider plants, comprising the following steps:

[0061] 1) Evenly mix the magnetotactic bacteria cultivated above with the 17cm thick soil on the surface of the heavy metal-contaminated soil, and the addition ratio of the magnetotactic bacteria is 9.6×10 per square meter of heavy metal-contaminated soil 9 A magnetotactic bacterium was cultivated for 33 days;

[0062] 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 form a magnetic field. The direction of the magnetic field is away from the ground and upward. sky;

[0063] 3) Collection step 3) Heavy metal-contaminated soil on the surface, the thickness of the collected heavy metal-contaminated soil is 7cm;

[0064] 4) Rinse the heavy metal-contaminated soil collected in ste...

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Abstract

The invention provides a method for recovering heavy metal contaminated soil through magnetotactic bacteria and chlorophytum comosum together. The magnetotactic bacteria and the heavy metal contaminated soil are mixed. The heavy metal contaminated soil mixed with the magnetotactic bacteria is irrigated. A magnetic field is set on the heavy metal contaminated soil, and the heavy metal contaminated soil containing the magnetotactic bacteria is collected, washed and filled back. The chlorophytum comosum is planted in the heavy metal contaminated soil primarily recovered through the magnetotactic bacteria and is removed overall after 90-100 days. The above steps are repeated until the content of heavy metal in the soil meets the safety standard. Compared with the prior art, the magnetotactic bacteria are easy to collect, and the chlorophytum comosum has high economic value besides recovering the soil. By means of the method, many kinds of heavy metal contaminated soil can be recovered at the same time, secondary pollution is avoided, and the method is suitable for treatment of 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 magnetotactic bacteria and spider plants. Background technique [0002] Soil pollution is caused by excessive harmful substances contained in the soil, exceeding the self-purification capacity of the soil, which causes changes in the composition, structure and function of the soil. Harmful substances gradually accumulate in the soil, through "soil→plant→human body", Or it can be indirectly absorbed by the human body through "soil → water → human body", reaching the level of endangering human health. Soil heavy metal pollution mainly includes mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) with significant biological toxicity, as well as zinc (Zn), copper ( Cu), nickel (Ni) and other elements, heavy metal pollution elements have poor mobility in the soil, long residence time,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/10
CPCB09C1/02B09C1/105B09C2101/00
Inventor 马新攀
Owner 贵州万通环保工程有限公司
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