Method for repairing soils polluted by heavy metal Cd

Abstract

The invention discloses a method for repairing soils polluted by heavy metal Cd, characterized in that a plant used for repairing the metal Cd is Cd-tolerant tobacco K326, a used soil chelation inducer is a hydrochloric acid solution of chitosan, microbes used for activating the heavy metal Cd in the soils are bacterial strain obtained by gathering, screening and separation in a laboratory, the three substances are combined to repair the soils polluted by the heavy metal Cd. The method comprises the following steps: cultivating a K326 seedling to the 3-leaf one-heart stage, then transplanting; before transplanting, adding chitosan; before transplanting, carrying out mass fermental cultivation of separated, screened and purified bacterial strain, adding the active bacterial strain of the heavy metal Cd at the logarithmic phase in the soils, and stirring for the subsequent use; and after transplanting the tobacco plant, regularly carrying out management. According to the invention, a plant-microorganism united repair method is adopted, and a certain amount of microbes of the active heavy metal are added in the soils to effect together, thus the repair efficiency is raised, and the efficiency of repairing the soils polluted by the heavy metal Cd is raised.

Description

technical field [0001] The invention relates to an environmental bioremediation technology method, in particular to a method for remediating soil polluted by heavy metal cadmium. Background technique [0002] Conventional methods for the treatment of heavy metal-contaminated soils, such as soil replacement, chemical oxidation, etc., phytoremediation is an emerging and efficient bioremediation approach. Phytoremediation has attracted increasing attention due to its advantages of good effect, low investment, low cost, easy management and operation, and no secondary pollution. It is recognized by the international academic community as an eco-friendly in-situ green restoration technology. However, currently the most valuable hyperaccumulator plants are often characterized by short plant size, low biomass, slow growth and long life cycle, so the restoration benefits are low. Moreover, usually a plant only enriches one or two heavy metals, and has poor tolerance to other metals ...

AI Technical Summary

Problems solved by technology

However, in practice, it is found that there are many deficiencies in single microbial remediation or phytoremediation

However, in the traditional research on the remediation of heavy metal pollution, there are many mechanisms of action. Some hyperaccumulator plants have small growth, and the growth of some microorganisms is limited by the root exudates produced by the enrichment plants, which makes the remediation effect poor.