Plant repair method of cadmium contaminated soil

Abstract

The invention provides a plant repair method of cadmium contaminated soil. The method comprises plantation of calendula officinalis in the cadmium contaminated soil. As the calendula officinalis is planted in the heavy metal-cadmium contaminated soil, the method not only can repair the soil and beauty the environment, but also can obtain economic benefit through extracting petal pigment; for the heavy metal-cadmium pollution conditions, the calendula officinalis can be used for repairing the soil; and the repair method is relatively lower in cost, obvious in repair effect, high in operability, incapable of generating adverse effect on physical and chemical properties of the soil and free of causing secondary pollution.

Description

Technical field [0001] The invention relates to the field of environmental protection, and in particular to a phytoremediation method for soil contaminated by cadmium. Background technique [0002] The content of cadmium, which is the most important element in the "five poisons" of heavy metals, is about 0.11×10-6 mg / kg in the crust. After a large amount of cadmium enters the human body through the food chain, it will cause various diseases such as hypertension, bone pain, osteoporosis and pulmonary edema. [0003] Atmospheric deposition, sewage irrigation, mining and industrial solid waste, pesticides and fertilizers, etc. are the main sources of soil cadmium pollution. According to statistics, the area of ​​land contaminated by Cd in my country has exceeded 150,000 mu, and the annual loss of food due to heavy metal pollution has reached 12 million tons, and cadmium rice alone has reached more than 50,000 tons. Studies have found that sewage irrigation in the sewage irrigation a...

AI Technical Summary

Problems solved by technology

However, both repair methods have defects, such as: large investment, complex equipment, secondary pollution, etc., so large-area repair cannot be realized

[0005] Cannabis cerevisiae, Baoshan viola, conifers, honeysuckle, pokeweed, centipede grass, vetiver, scale grass, Indian mustard, etc. are all super-accumulator plants for heavy metal cadmium, but some of them cannot adapt to Arid and semi-arid areas cannot survive due to the special environment. Although some can survive, the biomass is too small and the amount of heavy metals accumulated is very small.

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