A combined method of microbial and plant remediation of heavy metal-contaminated soil

Abstract

The invention provides a method for remediating heavy metal contaminated soil through combination of a microorganism and a plant. The method comprises the following steps: mixing a magnetotactic bacterium with the heavy metal contaminated soil, irrigating the heavy metal contaminated soil mixed with the magnetotactic bacterium, arranging a magnetic field on the heavy metal contaminated soil, collecting the heavy metal contaminated soil containing the magnetotactic bacterium, washing out the heavy metal contaminated soil, and conducting backfilling on the heavy metal contaminated soil; planting copper weeds in the heavy metal contaminated soil preliminarily remediated by the magnetotactic bacterium, and removing all the copper weeds after 10-12 months; and circularly repeating the steps till the content of heavy metal in soil is up to the safety standard. The method has the advantages that the treatment effect on the heavy metal contaminated soil is good, the operation is simple, the cost is low, heavy metal ions are directly removed, secondary contamination of soil is avoided, and the practicability is strong; moreover, the method is suitable for treating large-area contaminated soil.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a method for jointly repairing heavy metal-contaminated soil by microorganisms and plants. Background technique [0002] Soil is not only an important part of the earth's ecological circle, but also one of the important natural resources that human beings rely on for survival. With the development of industrial activities such as mineral mining and smelting, and agricultural activities such as sewage irrigation, application of sludge and low-quality chemical fertilizers, harmful heavy metals such as Cd and Pb continue to enter the soil environment, causing pollution to normal production and life. Therefore, the control of soil heavy metal pollution is of great significance to the ecological civilization and the healthy life of human beings. [0003] The traditional remediation methods for soil heavy metal pollution are usually physical and chemical methods, such as dil...

AI Technical Summary

Problems solved by technology

In order to avoid the risk of exposure to the human body, in recent years, more and more attention has been paid to the research on non-edible economic crops for phytoremediation. Coupled with the limitation of climate and soil environment, the accumulation of heavy metals in these plants is limited, which limits their application

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