A method of using stevia to remediate heavy metal polluted soil

Abstract

The invention discloses a method for repairing heavy metal polluted soil by using stevia. The method comprises the following steps: planting stevia in the heavy metal polluted soil for cultivation, and completing the repair of the heavy metal polluted soil. The method for repairing heavy metal-contaminated soil by using stevia in the present invention has the advantages of simple operation, low cost, high economic benefit, and good repairing effect, and solves the problems of low plant biomass and total absorption and accumulation of heavy metals in the existing heavy metal-contaminated soil repair technology. There are many problems such as small amount, tolerance and enrichment ability only for a single heavy metal, poor economic benefit, complicated plant field management, high management cost, and little comprehensive effect of practical application. No matter from the perspective of ecology or economics, the method of the invention has important practical significance.

Description

technical field [0001] The invention belongs to the technical field of phytoremediation of polluted environment, and relates to a method for remediating heavy metal polluted soil by using stevia. Background technique [0002] With the development of industry, urban pollution has intensified, and with the continuous progress of agricultural production, heavy metals accompanied by foreign organic compounds have become increasingly serious soil pollution. At present, there are different degrees of heavy metal pollution in the soil of various countries in the world. The average annual global emission of Hg is about 15,000 tons, Cu is 3.4 million tons, Pb is 5 million tons, Mn is 15 million tons, and Ni is 1 million tons. Heavy metal pollution will lead to soil degradation, while reducing the yield and quality of crops, and heavy metals will enter surface water and groundwater through runoff and leaching with rainwater and sediment, causing heavy metal pollution in water. [000...

AI Technical Summary

Problems solved by technology

However, the hyperaccumulator plants used in existing phytoremediation techniques have the following problems: limited by seasons, poor growth; low biomass in the aboveground parts; less total amount of heavy metals absorbed and accumulated; only resistant to and enriched for a single heavy metal; remediation The obtained plants can only be incinerated, have no reuse value, and have poor economic benefits; the overall effect of practical application is poor, etc. These problems seriously limit the wide application of phytoremediation technology in remediation of heavy metal contaminated soil

In addition, stevia is a natural sugar plant, and the inulin extracted from its plant is recognized as a low-calorie, high-sweet natural sweetener in the world, and is one of the raw materials for the food and pharmaceutical industries. But so far, there are no reports on the resistance and accumulation of stevia to heavy metals, and there is no report on the use of stevia to remediate heavy metal-contaminated soil

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