Method for repairing heavy metal polluted soil by using cadmium hyper-accumulation plant lantana camara

Abstract

The invention relates to a heavy metal polluted soil plant repair technology, in particular to a method for repairing heavy metal polluted soil by using cadmium hyper-accumulation plant lantana camara. The lantana camara serving as an ornamental plant has strong tolerance and accumulation capacity on cadmium; the plant is planted in the cadmium polluted soil; when the concentration of the cadmium reaches 50mg / kg, the biomass of the ground part of the plant is not remarkably inhibited; and meanwhile, the roots absorb a large amount of cadmium from the soil, the cadmium is transferred to the ground part of the plant through the xylem and accumulated, and then the cadmium content of the ground part exceeds the critical content standard 100mg / kg of the cadmium hyper-accumulation plant. When the plant is mature, the plant is removed and centralized for proper treatment so as to fulfill the purpose of removing the excessive cadmium in the soil. By continuously planting the plant and repeating the steps, the plant continually extracts and absorbs the cadmium in the polluted soil till the cadmium content of the soil reaches the environmental safety standard. The polluted soil treatment method for repairing the polluted soil and beautifying the environment is green and safe.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of heavy metal-contaminated soil, in particular to a method for treating and remediating cadmium-contaminated soil by utilizing the cadmium super-accumulated flower plant - five-color plum. Background technique [0002] Soil is one of the most basic material foundations for human survival, but with the "three wastes" produced by industrial production, the use of various pesticides and chemical fertilizers in agriculture, and the massive emissions of vehicle exhaust, the content of heavy metals in soil has increased sharply . According to incomplete statistics, the land polluted by heavy metals in the country has reached 2.0×10 7 hectares, accounting for 1 / 5 of the total arable land; among them, 10 million hectares of arable land are polluted by industrial "three wastes", and the production of grain is reduced by more than 10 million tons every year due to heavy metal pollution. Loss of ...

AI Technical Summary

Problems solved by technology

Due to the characteristics of concealment, irreversibility and serious consequences of heavy metal pollution, it is difficult and expensive to control [Document 2: Zhou Qixing, Song Yufang. Principles and methods of remediation of polluted soil [M]. Beijing: Science Press, 2004; 3: Sun Tieheng, Li Peijun, Zhou Qixing. Soil pollution formation mechanism and remediation technology [M]. Beijing: Science Press, 2005.]

Images