Treatment method of treating cadmium contaminated water

Abstract

The invention relates to a treatment method of treating cadmium contaminated water, and relates to a treatment method of contaminated water. The treatment method comprises the following steps of: planting one or two of a cadmium hyperaccumulator plant, namely nightshade, and leaf beta vulgarisvar.cicla into water to be treated; activating and absorbing cadmium contained in the contaminated water; continuously extracting the cadmium contained in the contaminated water by continuously and regularly collecting and replacing the plants till the cadmium content of the water achieves a safety standard; and culturing nightshade and leaf beta vulgarisvar.cicla plants: yielding the nightshade and leaf beta vulgarisvar.cicla plants through seed germination and greenhouse culture. One or two of the nightshade and the leaf beta vulgarisvar.cicla is or are planted in the water to be treated, and a planting method comprises the following steps of: planting the plants into a floating bed, wherein roots directly contact with the contaminated water through small holes drilled on the floating bed; and continuously and regularly collecting and replacing the plants, and collecting and replacing the plants for one time every 15-20 days till the cadmium content of a water body achieves the safety standard. According to the invention, the two plants have the advantages of hyperaccumulation capacity on the cadmium, root system upgrowth, vigorous growth, easiness for propagation and higher biomass, so that the cadmium contaminated water body is efficiently restored.

Description

technical field [0001] The invention relates to a treatment method for polluted water, in particular to a treatment method for cadmium-contaminated water. Background technique [0002] Cadmium has the "three causes" effect and is listed as one of the "five most dangerous environmental pollutants". After entering the human body, cadmium will produce irreversible toxic effects: first, when the kidneys try to excrete cadmium, the damage of cadmium to kidney function will continue to increase; second, cadmium enters the cells and irreversibly replaces calcium, resulting in calcium loss and bone pain all over the body , osteomalacia and fractures. In addition, it is also harmful to reproduction, tumor, cardiovascular, endocrine and other aspects. The "Itai-Itai disease" that occurred in Toyama Prefecture, Japan in the 1930s was caused by cadmium pollution that caused softening of the bones and bone pain throughout the body, which brought great pain to the local residents and h...

AI Technical Summary

Problems solved by technology

At present, the most researched and applied plants are mainly aquatic plants such as algae, water hyacinth, duckweed, and reeds. However, some of these plants have small biomass and some have poor absorption capacity for heavy metal cadmium, so it is difficult to obtain satisfactory restoration effects.