Heavy-metal polluted soil united directional restoration method by using plant-microorganism

Abstract

The invention relates to a method for remediation of heavy metals contaminated soil by a plant-microorganism joint direction method. The detailed steps of the method of the invention are that: firstly, resistant bacteria of plant and microorganism is sifted, so as to obtain plant and microorganism bacteria strains with heavy metal resistance; and then the seeds of the resistant plant is soaked and coated in microorganism resistant bacteria solution; finally, the seeds are planted in the soil contaminated by heavy metal, therefore the soil can be remedied. The method has the advantages of good remediation effect, low cost, easy management and operation, no secondary pollution and broad application prospect, therefore, the method is the most important development direction of soil remediation technique.

Description

technical field [0001] The invention relates to a method for remediating heavy metal-contaminated soil, in particular to a method for remediating heavy metal-contaminated soil by using a "plant-microbe" combined directional method. Background technique [0002] As an important part of the ecological environment on which human beings depend, soil is increasingly polluted by heavy metals. It is estimated that in the past 50 years, the global emission of Cd to the environment reached 2.20×10 4 t, Zn is 1.35×10 6 t. my country's soil heavy metal pollution is also quite serious, with millions of tons of toxic heavy metals released into the environment every year. Sources of soil heavy metal pollution include natural and man-made factors, mainly from the waste discharged by human beings in production and life, such as: ①Industrial pollution sources. ②Life pollution source. ③ Traffic pollution sources. ④Agricultural pollution sources. The main sources of soil heavy metal pol...

AI Technical Summary

Problems solved by technology

[0005] However, the key to using plants for pollution remediation is to find suitable hyperaccumulative or heavy metal-tolerant plants. However, accumulating plants usually have low biomass, slow growth, and are selective to metals. They are not suitable for the treatment of multiple heavy metal complex pollution, which limits plant Application of remediation technology in the treatment of soil contaminated by various heavy metals

However, it has been reported that factors such as higher root / branch ratio and carbon release from roots are significantly related to the number of rhizosphere soil microorganisms and affect the effectiveness of contaminated soil remediation.