Method for building ecological garden through heavy metal polluted site

Abstract

The invention discloses a method for building an ecological garden through a heavy metal polluted site. The method for building the ecological garden through the heavy metal polluted site comprises the following steps of preparing a curing agent, stabilizing an immobilization technology and cultivating plants; the method for building the ecological garden through the heavy metal polluted site hasthe advantages that the curing agent is formed by using hydrated calcium chloroaluminate and attapulgite, due to many micro pores of the hydrated calcium chloroaluminate and large specific surface area of the hydrated calcium chloroaluminate, the hydrated calcium chloroaluminate has a good effect on adsorbing heavy metal ions; and meanwhile, the attapulgite can adsorb, fix and passivate the heavymetals in the soil by utilizing the surface activity of the attapulgite, the adsorption property of the attapulgite, the catalytic property of the attapulgite, the filtration effect of the attapulgite, the ion exchange effect of the attapulgite, and the complexing effect of the attapulgite and the electrostatic effect of the attapulgite; thus the chemical morphology of the heavy metals in the soilis changed, the biological effectiveness of the heavy metals is improved, and the absorption of the plants on the heavy metals can be enhanced; and moreover, the heavy metals in the soil can be absorbed by the plants, and then the heavy metals are transferred into the nutrients required by the growth of the plants, thus the content of the heavy metals in the soil is reduced, the greening is further increased, and the ecological balance is facilitated.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal restoration, and in particular relates to a method for building an ecological garden on a heavy metal polluted site. Background technique [0002] Soil is one of the main natural resources that human beings rely on for survival, and it is also an important part of the human ecological environment. With the intensification of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, soil heavy metal pollution is becoming more and more serious. Soil heavy metal pollution refers to lead, mercury, chromium, cadmium, and metalloid arsenic with significant biological toxicity, and also includes toxic heavy metals such as copper, nickel, and zinc. With the development of industry, a large amount of untreated waste water, waste residue and waste gas containing heavy metals are discharged into the soil environment, causing the soil to be polluted to va...

AI Technical Summary

Problems solved by technology

Among them, the physical remediation method requires high costs and a large amount of engineering, and is usually used to deal with small-area garbage and severe pollution of waste, which is not suitable for large-scale soil remediation and treatment; the biological remediation method mainly uses biological absorption , degrade, and transform pollutants to achieve the purpose of treating polluted soil, but the bioremediation method, especially the phytoremediation method, has a long treatment cycle, slow effect, and the selection and adaptability of plants are small; the chemical remediation method is more commonly used in soil heavy metal pollution. The method of rapid control and remediation has obvious advantages in the simultaneous treatment of multiple heavy metal complex polluted soils