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Repairing method of heavy metal contaminated soil

A technology of polluted soil and remediation method, applied in the restoration of polluted soil and other directions, can solve the problems of easy re-release of heavy metals, high remediation cost, long remediation cycle, etc., and achieves improved remediation effect, low remediation cost, and difficulty in remediation. The effect of re-release

Inactive Publication Date: 2019-03-01
CHENGDU TECHCAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a soil remediation method for metal pollution in the treatment process, which is effective and solves the problems of low fixation efficiency, easy re-release of heavy metals and long remediation period in existing remediation methods and costly fixes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for repairing heavy metal contaminated soil, comprising the following steps:

[0031] (1) Excavating and crushing the heavy metal-contaminated soil that needs to be repaired to obtain fine-grained soil;

[0032] (2) Sprinkle the mixed repair agent into the fine-grained soil of step (1), add the mixed repair agent and soil according to the weight ratio of 1:30, stir evenly, then spray 0.5% phosphoric acid aqueous solution in the fine-grained soil, make the soil Keep the moisture at 30%, and finally cover the fine-grained soil with a film for 10 days of restoration;

[0033] (3) Add manure to the soil repaired in step (2), plow evenly, then put earthworms in at a density of 10 pieces / square meter, and simultaneously use 3.5×10 10 Magnetotactic bacteria were inoculated into the soil at a ratio of one / square meter, and cultivated for 20 days;

[0034] (4) Step (3) After the operation, water the soil to keep the soil flooded, then put a magnet on the soil surface,...

Embodiment 2

[0039] A method for repairing heavy metal contaminated soil, comprising the following steps:

[0040] (1) Excavating and crushing the heavy metal-contaminated soil that needs to be repaired to obtain fine-grained soil;

[0041] (2) Sprinkle the mixed repair agent into the fine-grained soil of step (1), add the mixed repair agent and soil according to the weight ratio of 1:50, stir evenly, then spray 0.5% phosphoric acid aqueous solution in the fine-grained soil, make the soil Keep the moisture at 60%, and finally cover the fine-grained soil with a film for 30 days of restoration;

[0042](3) Add manure to the soil after step (2), plow evenly, then put in earthworms at a density of 30 / square meter, and simultaneously use 6.0×10 10 Magnetotactic bacteria were inoculated into the soil at the ratio of one / square meter, and cultivated for 40 days;

[0043] (4) Step (3) After the operation, water the soil to keep the soil flooded, then put a magnet on the soil surface, and then re...

Embodiment 3

[0048] A method for repairing heavy metal contaminated soil, comprising the following steps:

[0049] (1) Excavating and crushing the heavy metal-contaminated soil that needs to be repaired to obtain fine-grained soil;

[0050] (2) Sprinkle mixed restoration agent into the fine-grained soil of step (1), add mixed restoration agent and soil according to the weight ratio of 1:38, stir evenly, then spray 0.5% phosphoric acid aqueous solution in fine-grained soil, make soil Keep the moisture at 45%, and finally cover the fine-grained soil with a film for 25 days of restoration;

[0051] (3) Add feces to the soil after step (2), plow evenly, then put earthworms in according to the density of 25 / per square meter, simultaneously according to 4.4×10 10 Magnetotactic bacteria were inoculated into the soil at a ratio of one / square meter, and cultivated for 30 days;

[0052] (4) Step (3) After the operation, water the soil to keep the soil flooded, then put a magnet on the soil surface...

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PUM

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Abstract

The invention discloses a repairing method of heavy metal contaminated soil. The repairing method includes the steps of (1), breaking heavy metal contaminated soil to obtain fine soil; (2), spreadingmixed repairing additives to the fine soil, spraying phosphoric acid solution to the fine soil to keep soil moisture at 45%, covering the fine soil with thin film, and repairing for 25 days; (3), adding excrement to repaired soil, adding in earthworms, inoculating magnetotactic bacteria to the fine soil, and culturing for 30 days; (4), keeping the soil submerged, placing magnets on the surface ofsoil, removing earthworms crawling out the soil, and cleaning the surface soil after 12 days; (5), planting grass in the soil. The repairing method can effectively solve the problems that fixing efficiency is low, heavy metal is easy to release again, repairing cycle is long, and repairing cost is high of the conventional repairing method.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating heavy metal polluted soil. Background technique [0002] With the sustained and rapid development of industry and agriculture in our country, soil heavy metal pollution is becoming more and more serious, threatening food production and human health, and has become one of the most attention-grabbing environmental problems. The high concentration of heavy metals in polluted soil will harm the growth and development of plants, resulting in reduced food production and quality; it will also change the biological population in the soil, affect the structure and function of its ecosystem, and lead to the degradation of soil productivity. [0003] Soil remediation is a technical measure to restore the normal function of polluted soil. In the soil remediation industry, there are more than one hundred existing soil remediation technologies, and there are ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08B09C1/10
CPCB09C1/00B09C1/08B09C1/10B09C1/105B09C2101/00
Inventor 高进长肖秀婵李强林陆一新吴菊珍赵立
Owner CHENGDU TECHCAL UNIV
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