Method for promoting symphytum officinale to enrich and absorb heavy metal from heavy metal contaminated soil

Abstract

The invention discloses a method for promoting symphytum officinale to enrich and absorb heavy metal from heavy metal contaminated soil. The method comprises the steps of planting the symphytum officinale in soil or a water body containing cadmium, lead and zinc contamination; adopting a field regulation measure during the period of plant growth; when the symphytum officinale grows to a mature stage, harvesting aboveground part of symphytum officinale plants or the whole symphytum officinale plants, and removing from the contaminated soil; repetitively planting, harvesting and removing in the cadmium, lead and zinc contaminated soil until the content of the cadmium, the lead and the zinc in the soil meet the environmental quality standard. According to the method for promoting the symphytum officinale to enrich and absorb the heavy metal from the heavy metal contaminated soil provided by the invention, the enrichment capacity of the symphytum officinale on the lead, the cadmium and the zinc during the natural growth process is adopted to achieve the aim of repairing lead contamination in the soil, and the method can be used for removing multiple contaminants at the same time, is low in cost, good in effect and high in operability, does not damage basic structures and functions of the water body or the soil, cannot cause secondary pollution, is beneficial to conserving water and soil and beautifying the environment, and can be popularized and applied in large area.

Description

technical field [0001] The invention belongs to the field of remediation of polluted soil, and in particular relates to a method for promoting the enrichment and absorption of heavy metals from heavy metal-polluted soil by asparagus. Background technique [0002] Heavy metal pollution in soil and water is one of the major environmental problems facing the world. As the largest developing country in the world, after more than 30 years of rapid development, my country has seriously polluted the soil and water environment. According to the "National Soil Pollution Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources on April 17, 2014, the total exceeding rate of cultivated land soil in my country is 16.1%, and the proportion of slightly, lightly, moderately and heavily polluted sites is 11.2% respectively. %, 2.3%, 1.5% and 1.1%. Inorganic pollutants are the main type of pollution, followed by organic pollutants, and compound poll...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for promoting the enrichment and absorption of heavy metals from heavy metal-contaminated soils by commemorative grass, aiming to solve the problems of high cost, poor effect, poor operability, and secondary The dangerous problem of sub-pollution

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