A method for synergistic remediation of soil heavy metal pollution by microorganisms, plants and biochar

A collaborative repair and heavy metal technology, applied in the field of contaminated soil treatment, can solve the problems of single heavy metal repair elements, low heavy metal absorption efficiency, long repair time, etc., and achieve high added value, improved physical and chemical properties, and low cost effects

Active Publication Date: 2017-12-26
HUNAN XISI ECOLOGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 2. To overcome the problems of low heavy metal absorption efficiency of resistant crops, single heavy metal repair elements, too long repair time, and low survival rate

Method used

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  • A method for synergistic remediation of soil heavy metal pollution by microorganisms, plants and biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Add the magnetotactic bacteria liquid culture medium to the soil polluted by heavy metals, the addition ratio of the magnetotactic bacteria liquid culture medium is to add 50mL of the magnetotactic bacteria liquid culture medium for every kilogram of heavy metal-contaminated soil, and add 50mL of the magnetotactic bacteria liquid culture medium in every square meter of heavy metal-polluted soil. Inoculate the soil with 7.0×10 8 A magnetotactic bacterium, plow the soil with a thickness of 10 cm on the surface of the heavy metal polluted soil, so that the magnetotactic bacterium liquid culture medium, the magnetotactic bacterium and the heavy metal polluted soil are fully mixed;

[0048] 2) Cultivate for 45 days; add magnetotactic bacteria liquid culture medium in the soil with a thickness of 3 cm on the heavy metal-contaminated soil surface layer, and the addition ratio is to add 30 mL of magnetotactic bacteria liquid culture medium per kilogram of heavy metal-contamin...

Embodiment 2

[0061] 1) Add the magnetotactic bacteria liquid culture medium to the heavy metal-contaminated soil, the addition ratio of the magnetotactic bacteria liquid culture medium is to add 80mL of the magnetotactic bacteria liquid culture medium for every gram of heavy metal-contaminated soil, and add 80mL of the magnetotactic bacteria liquid culture medium in every square meter of heavy metal-polluted soil. Inoculate 2.0×10 in the soil 9 A magnetotactic bacterium, plowing the soil with a thickness of 11 cm on the surface of the heavy metal polluted soil, so that the magnetotactic bacterium liquid culture medium, the magnetotactic bacterium and the heavy metal polluted soil are fully mixed;

[0062] 2) Cultivate for 47 days; add magnetotactic bacteria liquid culture medium in the soil with a thickness of 4 cm on the heavy metal-contaminated soil surface, and the addition ratio is to add 50 mL of magnetotactic bacteria liquid culture medium per kilogram of heavy metal-contaminated soil...

Embodiment 3

[0075] 1) Add the magnetotactic bacteria liquid culture medium to the heavy metal-contaminated soil, the addition ratio of the magnetotactic bacteria liquid culture medium is to add 60mL of the magnetotactic bacteria liquid culture medium in every gram of heavy metal-contaminated soil, and add 60mL of the magnetotactic bacteria liquid culture medium in every square meter of heavy metal-polluted soil. Inoculate 5.0×10 in the soil 9 A magnetotactic bacterium, plowing the soil with a thickness of 12 cm on the surface of the heavy metal polluted soil, so that the magnetotactic bacterium liquid culture medium, the magnetotactic bacterium and the heavy metal polluted soil are fully mixed;

[0076] 2) Cultivate for 50 days; add magnetotactic bacteria liquid culture medium in the soil with a thickness of 5 cm on the heavy metal-contaminated soil surface layer, and the addition ratio is to add 40 mL of magnetotactic bacteria liquid culture medium per kilogram of heavy metal-contaminated...

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Abstract

The invention provides a method collaboratively repairing soil heavy metal pollution by microorganisms, plants and biological carbon. The method specifically comprises: 1), adding a magnetotactic bacterium culture medium into heavy metal polluted soil, inoculating magnetotactic bacteria, and plowing; 2), irrigating the heavy metal polluted soil, and setting a magnetic field; 3), collecting the surface layer of the heavy metal polluted soil, and rinsing the collected heavy metal polluted soil with water; 4), planting grass family plants in the heavy metal polluted soil; 5), pulling out young ears; 6), removing the grass family plants; 7), after preparing a biological carbon mixture through processing the removed grass family plants, applying the biological carbon mixture into the heavy metal polluted soil in which the grass family plants are planted, uniformly mixing, and aging; and 8), cyclically repeating the above steps until the content of heavy metal in the soil reaches safety standards. The method is great in soil treatment effect, low in cost and high in practicability, and is safe and reliable.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a method for synergistically repairing soil heavy metal pollution by microorganisms, plants and biochar. 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): B09C1/10B09C1/02
CPCB09C1/02B09C1/105
Inventor 刘加力张卫赵轶侯晓丽肖琳
Owner HUNAN XISI ECOLOGY TECH
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