Remediation method for soil contaminated by polycyclic aromatic hydrocarbons (PAHs) by using gramineous plant Festuca arundinacea

Abstract

The invention relates to the field of plant remediation technology for soil contaminated by PAHs, specifically to a remediation method for soil contaminated by PAHs by using the gramineous plant Festuca arundinacea. The gramineous plant Festuca arundinacea is planted in soil contaminated by PAHs; in the process of germination, growth and maturation of the plant, PAHs in the soil are degraded, removed or substantially reduced through combined action of the growth process and root exudates of the plant. According to the method, the ornamental plant Festuca arundinacea is planted in the soil contaminated by PAHs for remediation of the soil contaminated by PAHs; compared with a traditional contaminated soil treatment method, the method provided by the invention has the advantages of small investment, small work amount, low technical requirements, etc. Moreover, as Festuca arundinacea is an ornamental and economic plant, planting of Festuca arundinacea enables PAHs contamination in environmental soil to be effectively degraded and contaminated plants not to enter into a food chain, thereby utmostly reducing ecological risks caused by treatment of the contaminated soil.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of polycyclic aromatic hydrocarbons (PAHs) polluted soil, in particular to a method for remediating polycyclic aromatic hydrocarbons polluted soil by using the grass phoenix. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of typical persistent organic pollutants with bioaccumulative, toxic, carcinogenic and mutagenic properties. As early as the 1970s, the U.S. Environmental Protection Agency had listed 16 PAHs for priority control, 7 of which were identified as animal carcinogens by the International Center for Cancer Research. PAHs are mainly produced in the incomplete combustion process of fossil fuels and organic substances. Studies have shown that 94% of PAHs entering the environment are accumulated in the soil environment, making soil the most important reservoir of PAHs. The rich organic matter in the soil can effectively adsorb such fat-soluble ...

AI Technical Summary

Problems solved by technology

At present, phytoremediation has been widely used in the treatment of PAHs-contaminated soil in the world. Until now, it has been reported that there are more than 40 kinds of plants that can promote the removal of PAHs, such as poplar, willow, parrot hair, etc., but the use of ornamental plants in phytoremediation There are few reports on soil remediation by natural phytoremediation, because ornamental phytoremediation has its unique advantages: for example, it can beautify the environment while performing soil remediation; ornamental plants will not enter the food chain, which can reduce the harm to the human body; The long-term production practice has accumulated a wealth of variety breeding, ornamental plant cultivation, and pest control, so the current ornamental plant restoration of polluted soil is in the ascendant

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