Bioremediation of Heavy Metal Contaminated Soil

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...

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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

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