Efficient method for repairing uranium contaminated soil by plant extraction

Abstract

The invention provides an efficient method for repairing uranium contaminated soil by plant extraction. The method comprises the following steps: (1) preparing uranium contaminated soil, and applyingbase fertilizer; (2) sowing ramie seeds which are XiangZhu No.7; (3) applying growing fertilizer after the seeds sprouts and grows out new leaves; and (4) cutting the grown ramies. The method can be used for efficiently repairing uranium contaminated soil, and is an economical and convenient uranium contaminated soil repairing method with high efficiency and good ecological efficiency since the ramie does not enter the food chain, has quick growth, large biomass, developed culture technology, complete plant protection measure, strong resistance and small rhizome size, is convenient for cuttingand concentrated treatment, and does not have the problem of biological invasion.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and in particular relates to a high-efficiency plant extraction and remediation method for uranium-contaminated soil. Background technique [0002] Uranium (U) is both a heavy metal and a nuclide with strong toxicity. my country is a big mining country, and has successively established a large number of uranium mining areas and uranium tailings pools. The average concentration of uranium in the surface soil (0-20cm) in my country is 3.03mg.kg -1 , while the U concentration in uranium tailings slag and contaminated soil can reach 26.11-122.1mg.kg -1 . The slag and waste rock produced by uranium mining and smelting pollute the surrounding soil, farmland and water bodies for a long time and are very harmful, posing a serious threat to the environment around the mine and the health and safety of the people. Therefore, the remediation of uranium-contaminated soil is an urgent...

AI Technical Summary

Problems solved by technology

[0006] (1) If the restoration plants belong to edible plants such as vegetables or fruits (such as Indian mustard greens, sunflowers, mustard mustard, four-season sesame oil lettuce, water spinach, chicory, green beans, sorghum, okra, yacon), there are problems of entering the food chain, being caught Significant risk of serious impact on human health due to accidental ingestion

[0007] (2) Pokeweed, mugwort, yellow herb osmanthus, saponins, five-jointed awns, imperata, boluohui, water centipede, spider plant, commelina, amaranthus, sorrel, willow leaf amaranth, hollow lotus, Herbaceous plants such as ghost needle grass, cocklebur, broken rice sedge, bamboo plum, mustard mustard, four-season sesame oil lettuce, water spinach, and chicory have small biomass, resulting in low restoration efficiency

[0008] (3) Pokeweed, mugwort, yellow herb osmanthus, mountain jute, saponin, five-jointed grass, imperatum, boluohui, water centipede, commelina, amaranthus, sorrel, amaranthus, and lotus seedlings The plant protection measures for wild plants such as , ghost needle grass, cocklebur, and broken rice sedge are not perfect, and there is a lack of mature technology for large-scale planting

[0009] (4) Some methods did not clearly and quantitatively study the tolerance indicators of uranium-enriched plants, such as mustard mustard (B.junceavar.tumida Tsen et Lee), mugwort (Artemisia argyi), yellow herb sweetheart (Melilotus officinalis), mountain jute ( Trema orientalis), Aeschynomene indica, Miscanthus floridulus, Imperata cylindrica; or studies have shown to be less tolerant, such as okra, amaranth

The tolerance of uranium-enriched plants is unclear or relatively poor, which will directly affect the restoration effect

[0010] (5) Uranium-contaminated soil is often accompanied by other heavy metal pollution, and some uranium-enriched plants lack the ability to repair various heavy metals

[0011] (6) The vast majority of uranium-enriching plants are root-enriching plants. Many scholars have not studied whether the activity of uranium or the toxicity of uranium is reduced after the root exudates and the soil environment around the rhizosphere are enriched by the rhizosphere. It is used for phytofixation and restoration

If the activity of uranium is not reduced or the toxicity is not weakened after being fixed by plants, if the roots rot, the toxic heavy metals will return to the soil, failing to achieve the purpose of remediating pollution

[0012] (7) If invasive plants, such as Pokeweed, are used for pollution remediation, large-scale planting may cause biological invasion problems

[0019] However, there are few studies on how to remediate uranium-contaminated soil by means of phytoextraction and remediation, and the results obtained are not satisfactory.

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