Farmland soil heavy metal pollution restoration method through coupling activating and passivating

Abstract

The invention provides a farmland soil heavy metal pollution restoration method through coupling activating and passivating, belonging to the technical field of environmental technology. According to a technical scheme adopted by the invention, the farmland soil heavy metal pollution restoration method comprises the following steps: a step I, planting heavy metal hyper-accumulation plant, applying a heavy metal activator into the soil, collecting plant which is enriched with heavy metals; a step II, applying a heavy metal passivator into the soil, planting and harvesting crops with heavy metal content reaching the safety standard. By two different coupling technologies in the two government stages, on one hand, the concentration of heavy metals in the farmland soil is lowered with high efficiency, on the other hand, the farmland can be put into safety production as early as possible, so that the heavy metal pollution farmland soil restoration efficiency is improved generally, and the method can be applied to farmland soil with large-area heavy metal pollution.

Description

technical field [0001] The invention belongs to the field of environmental technology protection. Background technique [0002] In recent years, the problem of soil pollution in my country has been continuously exposed and is becoming more and more serious. Among them, heavy metal pollution in farmland soil is one of the main problems, which involves crop food safety. Therefore, there is an urgent need for the treatment of heavy metal pollution in farmland soil. Compared with air and water pollution control, soil remediation technology is difficult and costly; although there are many existing heavy metal pollution control methods, typical methods include physical remediation, chemical remediation, and biological remediation, but they are suitable for farmland There are fewer low-cost methods for large areas. [0003] In terms of remediation of heavy metal pollution in farmland soil, compared with physical and chemical methods, bioremediation methods generally have low cost,...

AI Technical Summary

Problems solved by technology

However, because these phytoremediation methods are used alone, or simply combined with chemical remediation methods, the remediation period is long, and the heavy metal-contaminated farmland cannot be effectively used for a long time. The weakness of this phytoremediation method is very prominent, and the food safety of crops cannot be ensured as soon as possible.