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Biological remediation method for soil polluted by heavy metals

A bioremediation and polluted soil technology, applied in the field of soil remediation, can solve the problems of plant variation, affecting soil quality, enzyme activity reduction, etc., and achieve the effect of high growth rate and large biomass

Active Publication Date: 2015-01-21
孙一铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hazards of heavy metals: 1. The higher the content of heavy metals in the soil, the lower the microbial biomass and enzyme activity, which will affect the soil quality
2. The heavy metal elements in the soil that have different effects on plants will not affect the normal growth of plants at a certain concentration, but when the concentration exceeds a certain limit, they will have toxic effects on plants, affect the yield and quality of plants, and even cause plant mutation or extinction
Although microorganisms cannot degrade and destroy heavy metals, they can affect the migration and transformation of heavy metals in the environment by changing their physical and chemical properties

Method used

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  • Biological remediation method for soil polluted by heavy metals

Examples

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Effect test

Embodiment 1

[0031] Example 1 The bioremediation method of heavy metal polluted soil, the steps are as follows:

[0032] Select the heavy metal-contaminated soil to be repaired, manually remove weeds and shrubs, apply fully decomposed organic agricultural miscellaneous fertilizers at an amount of 400-800 kg / mu in late autumn and early winter, and plow 35-55cm deep to weather the soil and freeze to death overwintering pests , the land is thoroughly plowed and shredded; when the average temperature reaches above 10°C after the soil is thawed in spring, the woody fast-growing tree bamboo and willow with the ability to enrich heavy metals is transplanted; the annual seedlings of bamboo and willow are transplanted by interlaced hole planting, with a row spacing of 2.5 meters , the distance between plants is 1.2 meters; digging holes for colonization, the hole diameter is 0.5-0.8 meters, and the hole depth is 0.4-0.6 meters. After the transplanting is completed, irrigate once to make the root s...

Embodiment 2

[0034] Example 2 The bioremediation method of heavy metal polluted soil, the steps are as follows:

[0035] Select the heavy metal-contaminated soil to be repaired, remove weeds and shrubs manually, apply fully decomposed organic agricultural miscellaneous fertilizers at an amount of 500-700 kg / mu in late autumn and early winter, and plow 40-50cm deep to weather the soil and freeze to death overwintering pests , the land was thoroughly plowed and shredded; when the average temperature reached above 10°C after the soil thawed in spring, the woody fast-growing tree bamboo and willow with the ability to enrich heavy metals was transplanted; the annual seedlings of bamboo and willow were transplanted by interlaced hole planting, with a row spacing of 3.5 meters , the distance between plants is 1.8 meters; digging holes for colonization, the hole diameter is 0.5-0.8 meters, and the hole depth is 0.4-0.6 meters. After the transplanting is completed, irrigate once to make the root ...

Embodiment 3

[0037] Example 3 The bioremediation method of heavy metal polluted soil, the steps are as follows:

[0038] Select the heavy metal-contaminated soil to be repaired, remove weeds and shrubs manually, apply fully decomposed organic agricultural miscellaneous fertilizers at an amount of 600 kg / mu in late autumn and early winter, and plow 45cm deep to weather the soil, freeze the overwintering pests, and plow the land thoroughly Rake and crush; when the average temperature reaches above 10°C after the soil is thawed in spring, transplant the woody fast-growing arbor bamboo and willow with the ability to enrich heavy metals; transplant the annual bamboo and willow seedlings in the way of interlaced hole planting, with a row spacing of 3 meters and a plant spacing of 1.5 meters ; Digging holes for planting, the hole diameter is 0.5-0.8 meters, and the hole depth is 0.4-0.6 meters. After the transplanting is completed, irrigate once to make the root system of the seedlings more tig...

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Abstract

The invention provides a biological remediation method for soil polluted by heavy metals. The biological remediation method comprises the following steps: selecting the soil, to be remediated, polluted by the heavy metals, manually removing weeds and shrubs, applying enough decomposed organic agricultural foreign fertilizers in the end of autumn and the beginning of winter, deeply ploughing to enable the soil to be weathered, freezing overwintering pests for death, ploughing a land thoroughly and crushing the soil by a rake; after the soil is unfrozen in the spring, when the average temperature reaches more than 10 DEG C, transplanting woody and fast-growing trees, namely bamboo willows with heavy-metal enriching capability; after the transplanting is finished, when the temperature reaches more than 15 DEG C, implementing the earthworm remediating process, and then collecting earthworms; and after the first-time collection of the earthworms in the earthworm remediating process, planting a herbaceous plant, namely elsholtzia splendens with hyperaccumulating action to Cu<2+> and high growth speed so as to enhance the enriching action to copper ions of the shallow soil, and then wholly removing the elsholtzia splendens plants with roots. The biological remediation method provided by the invention has the advantages that not only can the effect of removing the heavy-metal pollution of the soil maximally be achieved, but also the secondary pollution to the soil is avoided.

Description

technical field [0001] The invention relates to a soil remediation method, in particular to a biochemical remediation method for heavy metal polluted soil, and belongs to the field of soil remediation methods. Background technique [0002] Soil is an important part of the self-heating ecosphere in which human beings live. With the rapid development of agriculture, industry and commerce, heavy metal pollution has seriously threatened the safety of the soil environment. [0003] Hazards of heavy metals: 1. The higher the content of heavy metals in the soil, the lower the microbial biomass and enzyme activity, which will affect the soil quality. 2. The heavy metal elements in the soil that have different effects on plants will not affect the normal growth of plants at a certain concentration, but when the concentration exceeds a certain limit, they will have toxic effects on plants, affect the yield and quality of plants, and even cause plant mutation or extinction. 3. The h...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 赵连祺
Owner 孙一铭
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