Method of remedying petroleum hydrocarbon contaminated soil by using ornamental plant Portulaca Grandiflora L.

Abstract

The invention relates to environmental remediation technology for organic contaminated soil, specifically to a phytoremediation method of remedying petroleum hydrocarbon contaminated soil by using the ornamental plant Portulaca Grandiflora L. According to the invention, degradation of target petroleum hydrocarbon (TPH) in contaminated soil is promoted by using the absorption action of the plant Portulaca Grandiflora L. itself and degradation effects of root exudates and rhizospheric microorganisms of Portulaca Grandiflora L. When the plants of Portulaca Grandiflora L. are mature, the plants can be integrally removed from soil and sold as goods; it is not necessarily to remove the plants. Through repeated plantation of Portulaca Grandiflora L. and repeated absorption action and degradationeffects of Portulaca Grandiflora L., petroleum hydrocarbon pollutants in contaminated soil can be continuously reduced until the content of the pollutants reaches national environment standard or ecological safety level. The method has the advantages of environmental beautification, no need of disposal of planted areas, physical and chemical properties not destroying soil, no secondary pollution,low cost, appropriateness to large scale operation, treatment of pollution, improvement of environment, etc.

Description

technical field [0001] The invention relates to an environmental restoration technology for organic polluted soil, in particular to a phytoremediation method for repairing petroleum hydrocarbon polluted soil by using an ornamental plant, Portulaca Grandiflora L. . Background technique [0002] Soil is one of the main environmental resources that human beings depend on for survival. In the past few decades, the types and quantities of toxic and harmful organic substances used by people have been increasing, and the organic pollutants entering the soil environment have been increasing. Soil organic pollutants not only directly lead to the decline of organisms living in it, but also endanger human health and even the safety of the entire ecological environment through the soil-plant system through the food chain, and cause surface water and groundwater pollution through the migration of pollutants. It poses a threat to the living environment of human beings on the level, expos...

AI Technical Summary

Problems solved by technology

However, so far, there are relatively few studies on plants capable of degrading excess petroleum hydrocarbons in soil at home and abroad; research in this area in my country is still in its infancy, and plants with independent intellectual property rights in my country for repairing petroleum hydrocarbon pollutants are just Fewer, coupled with incomplete research on agronomic traits, pest control, breeding potential and physiology, seriously affect its application in actual restoration [Document 16: S.E.Gaskin, R.H.Bentham, Rhizoremediation of hydrocarbon contaminated soi l using Australian native grasses .Science of The Total Environment, 2010, 408, 3683-3688.]

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