Method of repairing heavy metal contaminated soil by utilizing turmeric

Abstract

The invention relates to a plant repairing technology of heavy metal contaminated soil, in particular to a method of repairing the heavy metal contaminated soil by utilizing turmeric, solving the problems of short plants, slow growth, low biomass, less total amount of absorbed and accumulated heavy metals, resistance and enrichment capacity to single heavy metal, poor economic benefit, poor actual application comprehensive effect and the like existing in the conventional heavy metal contaminated soil repairing technology. The method comprises the following steps of: directly planting the turmeric in the heavy metal compositely contaminated soil and performing conventional cultivation. The turmeric can normally grow in the contaminated soil, has no obvious poisoning symptoms and dose not affect the root tuber saponin content in the turmeric; the root system of the turmeric is developed, the biomass is large, and a large amount of various heavy metals can be absorbed and accumulated; and particularly, the contents of heavy metals Zn and Cd in fibrous roots are obviously higher than a soil background value to achieve the level of super enrichment. The method has the advantages of simple cultivation, low management cost, capability of benefiting from one-time planting for many years, extremely high medicinal value and capabilities of preventing the heavy metals from reentering a food chain and gaining certain economic income during contamination treatment.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating soil polluted by copper, zinc and arsenic by using Dioscorea scutellaria. Background technique [0002] Soil is one of the natural resources that human beings cannot live without, and it is also an important part of the ecological environment. With the development of industry, the aggravation of urban pollution and the continuous progress of agricultural production, the pollution of soil by heavy metals accompanied by foreign organic compounds has become increasingly serious (Pambrun V, Marquot A, Racault.Characterization of the toxic effects of cadmium and3.5-dichlorophenol on nitrifying activity and mortality in biologically activated sludge systems-effect of low temperature[J].Environ Science Pollution Resource.2008,15:592–599.), soil heavy metal pollution has become a serious global environmental problem. Heavy metal pollution...

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