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Method for restoring polluted soil through combination of microorganisms and plants

A technology of combined restoration of polluted soil, applied in the field of soil pollution control, can solve the problems that plants cannot grow biomass, limit the application and development of phytoremediation, and achieve the effect of simple and feasible method, pollution reduction and good repair effect

Inactive Publication Date: 2019-01-18
杭州滨江区市政园林工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in areas seriously polluted by heavy metals, plants usually cannot grow or the biomass is too small, which limits the application and development of phytoremediation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for joint restoration of contaminated soil by microorganisms and plants, comprising the following steps:

[0034] 1) Mix the magnetotactic bacteria with the soil with a thickness of 20cm on the surface of the polluted soil, and cultivate for 20-25 days. The polluted soil contains at least three heavy metal elements: Pb, Ni, and Cu; the inoculation ratio of the magnetotactic bacteria is per square meter Inoculate 6.5×10 in contaminated soil 10 ; 2) Irrigate the contaminated soil in step 1) to make it in a flooded state, and place a magnet on the contaminated soil to make the magnetotactic bacteria return to the soil surface from the depth of the soil; 3) Collect after 20 days in step 2) and The surface soil in contact with the magnet is rinsed with water, the eluent is collected, and the heavy metals in the soil are extracted. The soil after leaching is returned to the original place and dried until loose; the depth of the collected soil is 10cm; 4) Go to step 3...

Embodiment 2

[0036] A method for joint restoration of contaminated soil by microorganisms and plants, comprising the following steps:

[0037] 1) Mix the magnetotactic bacteria with the soil with a thickness of 20cm on the surface of the polluted soil, and cultivate for 20-25 days. The polluted soil contains at least three heavy metal elements: Pb, Ni, and Cu; the inoculation ratio of the magnetotactic bacteria is per square meter Contaminated soil was inoculated with 7.0×10 10 ; 2) Irrigate the contaminated soil in step 1) to make it in a flooded state, and place a magnet on the contaminated soil to make the magnetotactic bacteria return to the soil surface from the depth of the soil; 3) Collect after 20 days in step 2) and The surface soil contacted by the magnet is rinsed with water, the eluent is collected, and the heavy metals in the soil are extracted. The soil after the rinse is returned to the original place and dried until loose; the depth of the collected soil is 13cm; 4) Go to s...

Embodiment 3

[0039] A method for joint restoration of contaminated soil by microorganisms and plants, comprising the following steps:

[0040] 1) Mix the magnetotactic bacteria with the soil with a thickness of 20cm on the surface of the polluted soil, and cultivate for 20-25 days. The polluted soil contains at least three heavy metal elements: Pb, Ni, and Cu; the inoculation ratio of the magnetotactic bacteria is per square meter Inoculate contaminated soil with 7.5×10 10 ; 2) Irrigate the contaminated soil in step 1) to make it in a flooded state, and place a magnet on the contaminated soil to make the magnetotactic bacteria return to the soil surface from the depth of the soil; 3) Collect after 20 days in step 2) and The surface soil contacted by the magnet is rinsed with water, the eluent is collected, and the heavy metals in the soil are extracted. The soil after the rinse is returned to the original place and dried until loose; the depth of the collected soil is 15cm; 4) Go to step 3...

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Abstract

The invention discloses a method for restoring the polluted soil through combination of microorganisms and plants. The method comprises the following steps that 1, magnetotactic bacteria is uniformlyblended with 20m-thick soil of a surface layer of polluted soil and cultured for 20-25 days; 2, the mixture is irrigated to be in a drowned state, and a magnet is placed on the polluted soil; 3, the surface soil in contact with the magnet is collected 20 days later and rinsed with water, rinsing liquid is collected, heavy metals in the soil are extracted, and the rinsed soil is placed to the original place to be aired till the soil is loose; 4, microbial bacteria is added into the soil; and 5, festuca arundinacea is planted, and integrally removed one year later. The oxygen content of the surface of the soil is reduced in the drowned state by selecting the magnetotactic bacteria, the magnet is placed on the surface of the soil to guarantee the magnetotactic bacteria to move towards the surface of the soil, the heavy metals in the soil can be adsorbed in the moving process of the magnetotactic bacteria, the accumulated amount of the heavy metals is reduced, the method is simple and workable, and the restoration effect is good.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a method for jointly repairing polluted soil by microorganisms and 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 elements with significant biological toxicity such as mercury, cadmium, lead, chromium, and metalloid arsenic, as well as elements with certain toxicity such as zinc, copper, and nickel. Morphological transformation and migration occur, and cannot be degraded by microorganisms. [...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/02
CPCB09C1/02B09C1/10B09C1/105
Inventor 徐大龙徐若平
Owner 杭州滨江区市政园林工程有限公司
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