Method for comprehensively treating contaminated soil by using multiple plants

Abstract

The invention relates to a method for comprehensively treating contaminated soil by using multiple plants. The method comprises the following steps that the ditching is performed; a greenhouse is arranged above soil to be repaired; seeds of sorrel grass are sowed in ditches at equal intervals; at least one blank ditch is formed between every two adjacent rows of the ditches sowed with the sorrel grass; wild amaranth seeds are sowed in the blank ditches at equal intervals; the temperature, the humidity, the illumination time, the radiation power (PRA watts) and the concentration of carbon dioxide in the greenhouse are controlled; N elements are used for assistance; after the growth period of wild amaranths is finished, and the cleaning is finished, seedlings of the sorrel grass are transplanted in the ditches at equal intervals; when the sorrel grass grows to 50-80 cm, the parts of the sorrel grass from the ground by 5-8 cm are cut; after the cut parts are dried and incinerated in an appointed place, heavy metal is extracted; when the wild amaranths grow to 30-50 cm, the parts from the ground by 3-6 cm are cut; after the cut parts are dried and incinerated in the appointed place, the heavy metal is extracted; and the process of extraction after cutting, drying and incineration is repeated.

Description

technical field [0001] The invention relates to the technical field of soil restoration in environmental protection, in particular to a method for comprehensively treating soil with plants. Background technique [0002] Since the 20th century, the rapid development of science and technology has promoted economic development and improved people's living standards. As well as the development of the mining industry, it has seriously polluted the soil, water quality and atmosphere. However, cadmium (Cd), one of the "five poisons" of heavy metals, has the characteristics of concealment, long-term and irreversible pollution in the environment. Great influence. The "cadmium rice" incident was caused by soil pollution by cadmium. Therefore, cadmium-contaminated soil urgently needs to be treated. This year, my country will start the comprehensive treatment of heavy metal-contaminated farmland restoration. The Ministry of Agriculture advocates scientifically and rationally determi...

AI Technical Summary

Problems solved by technology

[0002] Since the 20th century, the rapid development of science and technology has promoted economic development and improved people's living standards. As well as the development of the mining industry, it seriously pollutes the soil, water quality and atmosphere

Because the aboveground biomass of known hyperaccumulator plants is generally small and slow to grow, and many of them come from heavy metal mines (containing a variety of heavy metals), the growth range is narrow, which limits the popularization and application of phytoremediation technology.

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