Method for restoring soil polluted by heavy metal through combination of magnetotactic bacteria and plants

Abstract

The invention provides a method for restoring soil polluted by heavy metal through a combination of magnetotactic bacteria and plants. The magnetotactic bacteria and the soil polluted by the heavy metal are mixed and irrigated, and magnetic fields are arranged on the soil polluted by the heavy metal to collect heavy metal polluted soil containing the magnetotactic bacteria, drip washing of the soil polluted by the heave metal is conducted and backfill is conducted; bamboo willows and crimson leafbeet are planted on the soil polluted by the heavy metal at the same time, and the crimson leafbeet is removed after 50-60 days; then crimson leafbeet is planted again, and the crimson leafbeet is removed after 50-60 days; the steps of planting and removal of the crimson leafbeet are repeated; and the bamboo willows and the crimson leafbeet are removed at the same time 1.5-2.5 years later, and the steps are executed circularly and repeatedly until the content of the heavy metal in the soil is up to the safety standard. Compared with the prior art, the magnetotactic bacteria are easy to collect, the growth cycle of the bamboo willows is short and the absorption efficiency of the heavy metal is high. The crimson leafbeet is easy to grow and has a hyperaccumulation ability of cadmium. The method is capable of restoring the soil which is polluted by various heavy metals at the same time, and free of secondary pollution to the 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 magnetotactic bacteria 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, as well as 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 metho...

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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