Method for repairing and treating soil with heavy metal pollution using daisy

Abstract

The invention relates to phytoremediation technology for treating polluted environment, in particular to a method for reparing cadmium-polluted earth by using a cadmium-enriched flower, namely Bellis perennis. The method utilizes root systems of the cadmium-enriched plant Bellis perennis to absorb cadmium enriched in the polluted earth in large amount, transfers the cadmium upward to the overground part, integrally removes the plant and properly treats the plant when the plant grows to the blossom time, thereby the plant absorbs and removes a large amount of the cadmium from the earth; and by repeatedly planting the plant and repeating the process, excessive cadmium in the earth can be continuously extracted until the content of the cadmium achieves the environment safety standards. The method has the advantages of small engineering quantity, no destruction to physicochemical property of the earth, no secondary pollution, beautifying the environment beautification while treating the polluted earth, and the like.

Description

technical field [0001] The invention relates to the phytoremediation technology of polluted environment, in particular to a method for remediating heavy metal polluted soil by using daisies. Background technique [0002] Due to the arbitrary discharge of industrial "three wastes" and unreasonable agricultural production activities, heavy metal pollution in my country's soil environment has become increasingly serious. According to statistics, the area of ​​cultivated land polluted by heavy metals such as cadmium, arsenic, and lead in my country is nearly 20 million ha, accounting for about 1 / 5 of the total cultivated land area; my country's annual reduction of grain production due to heavy metal pollution exceeds 10 million tons. It is also up to 12 million tons per year, resulting in a total economic loss of at least 20 billion yuan. 11:143-151.]. According to reports, the Dayu Mining Area in Jiangxi, the Zhangshi Irrigation Area in Shenyang City, and the Shachuan Irrigatio...

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Problems solved by technology

However, there are still relatively few cadmium-accumulating / hyperaccumulating plants that have been discovered, and even fewer have my country's independent intellectual property rights; most of the cadmium-enriching / hyperaccumulating plants that have been screened are wild species, with poor regional adaptability , coupled with incomplete research on agronomic traits, pest control, breeding potential, and physiology, seriously affects its application in actual restoration [Document 5: Ute K. Phytoremediation: novel approaches to cleaningup polluted soils. Current Opinion in Biotechnology, 2005 , 16:133-141.]

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