Method for repairing cadmium-polluted soil/bottom mud using beta vulgaris var.cicla l

Abstract

The invention relates to a method for repairing cadmium-polluted soil / bottom mud using beta vulgaris var.cicla l. According to the method, beta vulgaris var.cicla l is planted in cadminum-polluted soil / bottom mud, and the plant is entirely moved out from the polluted soil / bottom mud when growing to the mature period to achieve the purpose of removing heavy metal cadmium in the soil / bottom mud; the planted vulgaris var.cicla l adopts the beta vulgaris var.cicla l with 4-6 true leaves which is transplanted into the cadmium-polluted soil / bottom mud; and the beta vulgaris var.cicla l planted in the cadmium-polluted soil / bottom mud is planted in a green house, and regularly watered to enable the soil water content to be kept at 60-70 percent of the field water capacity. The method can keep permanent treatment effect, in-situ treatment process, low treatment cost, environmental aesthetics and simple post-treatment.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of heavy metal-contaminated soil / bottom mud, in particular to a method for repairing heavy metal cadmium-polluted soil / bottom mud by using red oyster for leaves. Background technique [0002] Soil heavy metal pollution not only leads to the reduction of food production, but also enters the food chain through plant absorption and endangers human life and health. At the same time, heavy metals in polluted soil, as a potential secondary pollution source, are likely to pollute surface water and groundwater through runoff and leaching . At present, the area of ​​cultivated land polluted by heavy metals such as cadmium, arsenic, chromium and lead in my country is nearly 20 million hectares, accounting for about 1 / 5 of the total cultivated land area. The country's annual output of more than 10 million tons of grain is reduced due to heavy metal pollution. There are also as many as 12 million ton...

AI Technical Summary

Problems solved by technology

This type of engineering measure is a relatively classic soil heavy metal pollution control measure. Although it has the characteristics of thoroughness and stability, it requires a large amount of engineering work, high investment costs, damage to the soil structure, and causes a decline in soil fertility. Therefore, it is not an ideal method for remediation of contaminated soil

There are also methods such as leaching and phytoremediation, which can fundamentally solve the problem of removing heavy metals. Among them, leaching is to use chemical solvents to clean the contaminated soil and wash away heavy metals. In addition to the huge and large amount of engineering, there is also the problem of secondary pollution. How to deal with the toxic solvents washed down is a difficult problem. In addition, the soil after leaching often becomes gravel, which loses the function of the soil itself and greatly reduces use value

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