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Microbe and solidifying agent combined in-situ remediation method of heavy metal contaminated soil

A technology of in-situ restoration of polluted soil, applied in the field of polluted soil treatment, can solve the problems of unstable long-term curing effect of curing agent, secondary pollution, narrow application area, etc., and achieve no damage to soil fertility, no secondary pollution, The effect of less investment

Active Publication Date: 2015-12-16
江苏环保产业技术研究院股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Microbe and solidifying agent combined in-situ remediation method of heavy metal contaminated soil

Examples

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Effect test

Embodiment 1

[0035] A combined in-situ restoration method of microorganisms and curing agents for heavy metal-contaminated soil, comprising the following steps:

[0036] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the surface layer of heavy metal-contaminated soil evenly, the thickness of the surface layer is 15cm, and the inoculation ratio of magnetotactic bacteria is 7.0×10 9 A magnetotactic bacterium was maintained for 20 days;

[0037] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil in a flooded state, and set an energized coil on the heavy-metal-contaminated soil to generate a magnetic field. The direction of the magnetic field is away from the ground. sky;

[0038] 3) Collect the heavy metal-contaminated soil in the direction of the magnetic field in step 3), and the thickness of the collected heavy-metal-contaminated soil is 11cm;

[0039] 4) Rinse the heavy metal-contaminated soil coll...

Embodiment 2

[0044] A combined in-situ restoration method of microorganisms and curing agents for heavy metal-contaminated soil, comprising the following steps:

[0045] 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 19cm, and the inoculation ratio of magnetotactic bacteria is 8.0×10 9 A magnetotactic bacterium was maintained for 30 days;

[0046] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil flooded, and set an electrified coil on the heavy-metal-contaminated soil to generate a magnetic field. The direction of the magnetic field is away from the ground. sky;

[0047] 3) Collect the heavy metal-contaminated soil in the direction of the magnetic field in step 3), and the thickness of the collected heavy-metal-contaminated soil is 15cm;

[0048] 4) Rinse the heavy metal-contaminated soil collected in st...

Embodiment 3

[0053] A combined in-situ restoration method of microorganisms and curing agents for heavy metal-contaminated soil, comprising the following steps:

[0054] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the surface layer of heavy metal-contaminated soil evenly, the thickness of the surface layer is 17cm, and the inoculation ratio of magnetotactic bacteria is 7.5×10 per square meter of heavy metal-contaminated soil. 9 A magnetotactic bacterium was maintained for 26 days;

[0055] 2) Irrigate the heavy metal-contaminated soil mixed with magnetotactic bacteria to keep the heavy-metal-contaminated soil flooded, and set an electrified coil on the heavy-metal-contaminated soil to generate a magnetic field. The direction of the magnetic field is away from the ground. sky;

[0056] 3) Collect the heavy metal-contaminated soil in the direction of the magnetic field in step 3), and the thickness of the collected heavy-metal-contaminated soil is 12cm;

[0057] 4) Ri...

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Abstract

The invention provides a microbe and solidifying agent combined in-situ remediation method of heavy metal contaminated soil. The microbe and solidifying agent combined in-situ remediation method comprises the following steps: mixing magnetotactic bacteria and heavy metal contaminated soil; irrigating heavy metal contaminated soil mixed with magnetotactic bacteria; arranging a magnetic field on heavy metal contaminated soil; collecting heavy metal contaminated soil containing magnetotactic bacteria; leaching the collected heavy metal contaminated soil and back-filling; adding a solidifying agent into heavy metal contaminated soil subjected to magnetotactic bacteria adsorption treatment, and curing for 30-45 days; and circularly repeating the steps till the content of heavy metals in soil reaches the safe standard, wherein the solidifying agent consists of SiO2, Fe2O3, Al2O3 and C3N3S3Na3. The microbe and solidifying agent combined in-situ remediation method belongs to in-situ remediation, is simple to operate, low in cost and good in remediation effect, avoids secondary contamination of soil, and is suitable for remediation of large-area contaminated soil.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment, and in particular relates to a combined in-situ restoration method of microorganisms and a curing agent for heavy metal-contaminated soil. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/02B09C1/08
Inventor 马新攀
Owner 江苏环保产业技术研究院股份公司
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