Biochemistry combined method for restoring soil cadmium ion pollution

Abstract

The invention discloses a biochemistry combined method for restoring soil cadmium ion pollution in the technical field of environmental protection. Mainly, mirabilis jalapa L and EDTA are adopted for reducing the content of cadmium ions in soil. According to the specific implementation way, firstly, the cadmium ion polluted soil is deep ploughed so that the soil can be loosened, and the ploughing depth ranges from 30 cm to 40 cm; the soil is leveled; then irrigation is performed, and a certain proportion of EDTA is applied along with irrigation water; after the soil is aired and sowing can be performed, direct seeding of the mirabilis jalapa L is performed at the line spacing width of 50 cm, and irrigation is performed; when seedlings of the mirabilis jalapa L emerge and grow to have 3-4 cotyledons, a certain proportion of EDTA is applied along with irrigation water; and conventional management is performed, the whole mirabilis jalapa L is harvested when the mirabilis jalapa L is withered and yellow at later autumn, and concentrated treatment of dangerous waste is performed. By means of the method, the content of the cadmium ions in the soil can be reduced by 45% to 52% in one growth period of the mirabilis jalapa L.

Description

technical field [0001] The invention relates to a biochemical combined restoration method for polluted soil, in particular to a biochemical combined restoration method for soil polluted by cadmium ions. Background technique [0002] Soil is the final "camp" of various pollutants. 90% of the world's pollutants end up in the soil, posing a potential threat to national health and becoming a major obstacle to my country's sustainable development. By the end of the 20th century, the area of ​​polluted cultivated land in my country had reached more than 20 million hectares, accounting for about 1 / 5 of the total cultivated land area. Every year, 10 million tons of grain production was reduced due to soil pollution, and another 12 million tons of grain were polluted. Direct economic losses amounted to more than 20 billion yuan. Soil pollution has become one of the major obstacles restricting the international trade of agricultural products and the sustainable development of social e...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved: the present invention aims at the problems found in the actual production, combines chemical remediation and biological remediation to remediate cadmium ion contaminated soil, and mainly uses EDTA to activate cadmium ions in the soil to increase the amount of cadmium ions in the soil. concentration, and then plant cadmium ion-tolerant plants, through the absorption of plants, the excessive cadmium ions in the soil will be taken out of the soil, fundamentally solving the problem of soil cadmium ion pollution