Heavy metal soil remediation method

Abstract

The invention discloses a remediation method for heavy metal soil. The method comprises the following steps: 1, mixing magnetotactic bacteria with soil with the soil surface thickness of 10-15 cm, forming a magnetic field is arranged on the soil surface, culturing that magnetotactic bacteria for 20-30 days, modifying straw ropes, burying the modified straw ropes under the ground by 40-50 cm; after15-45 days, moving out the straw ropes, adding a soil conditioner to the treated soil to remediate the soil, planting hyperaccumulator plants in the improved soil, and removing the plants two years later. According to the remediation method for the heavy metal soil, magnetotactic bacteria and modified straw ropes are used for conducting surface layer remediation and deep layer remediation on thesoil respectively, hyper-accumulation plants are used for absorbing the balance heavy metal in the soil, and the effect of deep remediation of the heavy metal soil is achieved.

Description

technical field [0001] The invention relates to the technical field of soil remediation, and more specifically relates to a method for remediating heavy metal soil. Background technique [0002] Soil pollution is caused by too many 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 and are indirectly absorbed by the human body through the soil-plant-human body. The most common soil pollution is heavy metal pollution, which mainly includes elements with significant biological toxicity such as mercury, cadmium, lead, chromium and metalloid arsenic, as well as certain toxic zinc, copper, nickel, etc. element. [0003] At present, the methods of removing heavy metals in soil are mainly through plant adsorption, microbial degradation, chemical reagent decomposition, etc. Although plant adsorption can achieve...

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Problems solved by technology

[0003] At present, the methods of removing heavy metals in soil are mainly through plant adsorption, microbial degradation, chemical reagent decomposition, etc. Although plant adsorption can achieve the purpose of green adsorption of heavy metals, the ability of plants to absorb heavy metals is limited, and the metabolism of plants themselves The heavy metal content in the soil cannot be controlled within a reasonable range; the decomposition of chemical reagents can effectively remove heavy metals in the soil, but the chemistry itself will also reduce the quality of the soil and cause soil pollution again