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A method for joint restoration of heavy metal-contaminated soil by microorganisms and curing agents

A technology of combined restoration of contaminated soil, applied in the field of contaminated soil treatment, can solve the problems of unstable long-term curing effect of curing agent, narrow application area, secondary pollution, etc., to achieve no damage to soil fertility, avoid secondary pollution, and facilitate recycling Effect

Active Publication Date: 2018-07-20
张智平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the convenient operation and quick effect, it plays an irreplaceable role in the process of polluted soil treatment; at present, the main curing agents are cement, lime, fly ash, etc., and their application range is narrow, the cost is high, and some curing agents themselves There are secondary pollution, such as fly ash, the long-term curing effect of the curing agent is unstable, etc.

Method used

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  • A method for joint restoration of heavy metal-contaminated soil by microorganisms and curing agents

Examples

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Effect test

Embodiment 1

[0036] A method for jointly repairing heavy metal-contaminated soil by microorganisms and curing agents, comprising the following steps:

[0037] 1) Mix the above-mentioned cultivated magnetotactic bacteria with 15 cm thick soil on the surface of heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 7.0×10 per square meter of heavy metal-contaminated soil 9 A magnetotactic bacterium was cultivated for 30 days;

[0038] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil in a flooded state, and place 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;

[0039] 3) Change the direction of the magnetic field so that the direction of the magnetic field is parallel to the ground, and keep the magnetic field strength unchanged for 45 days;

[0040] 4) Collect the surface layer of h...

Embodiment 2

[0047] A method for jointly repairing heavy metal-contaminated soil by microorganisms and curing agents, comprising the following steps:

[0048] 1) Mix the above-mentioned cultured magnetotactic bacteria with the surface layer of heavy metal-contaminated soil evenly, the thickness of the surface layer is 15cm, 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 20 days;

[0049] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil in a flooded state, and place 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;

[0050] 3) Change the direction of the magnetic field so that the direction of the magnetic field is parallel to the ground, and the strength of the magnetic field remains unchanged for 47 day...

Embodiment 3

[0058] A method for jointly repairing heavy metal-contaminated soil by microorganisms and curing agents, comprising the following steps:

[0059] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the 15 cm thick soil on the surface of the heavy metal-contaminated soil, and the addition ratio of the magnetotactic bacteria is 8.0×10 per square meter of heavy metal-contaminated soil. 9 A magnetotactic bacterium was cultivated for 25 days;

[0060] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil in a flooded state, and place 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;

[0061] 3) Change the direction of the magnetic field so that the direction of the magnetic field is parallel to the ground, and the strength of the magnetic field remains unchanged for 50 days;

[0062] 4) Collect...

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Abstract

The invention provides a method for combining microorganisms with a curing agent to remediate heavy metal contaminated soil. The method comprises the following steps: mixing magnetotactic bacteria with heavy metal contaminated soil, irrigating the heavy metal contaminated soil which is mixed with the magnetotactic bacteria, setting magnetic fields on the heavy metal contaminated soil, collecting the heavy metal contaminated soil containing the magnetotactic bacteria, leaching the heavy metal contaminated soil, and re-filling the heavy metal contaminated soil; embedding a porous hard plastic capsule containing the curing agent into the heavy metal contaminated soil subjected to adsorption treatment by the magnetotactic bacteria, culturing the porous hard plastic capsule for 20-25 days, then, taking back the embedded porous hard plastic capsule; and repeating the steps in a circulating mode until content of the heavy metals in the soil reaches the safety standards. The method for combining microorganisms with a curing agent to remediate heavy metal contaminated soil disclosed by the invention belongs to in-situ remediation, is simple to operate, low in cost, good in remediation effect, capable of directly removing heavy metal ions without causing secondary pollution on the soil, and suitable for large-area contaminated soil governance.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment, in particular to a method for jointly repairing heavy metal-contaminated soil by microorganisms and curing agents. 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, can onl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
Inventor 马新攀
Owner 张智平
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