Method for removing toxic organic pollutants from sediment by using plant

Abstract

The invention relates to a method for removing toxic organic pollutants from sediment by using a plant, which is characterized by selecting seedlings or mature seedlings of an emergent aquatic plant such as Scirpus validus Vahl with a strong absorption capacity to toxic organic pollutants in the sediment, wherein the seedlings with a height of 60 cm are preferably selected. The method provided by the invention has the advantages that: Scirpus validus Vahl has a good remediation effect on the pollution of pentachlorophenol and polybrominated diphenyl ethers and / or deca-brominated diphenyl ether in the sediment, can remove 99% of pentachlorophenol in the polluted sediment within 90 days, and can remove 37.44% of deca-brominated diphenyl ether within 180 days; meanwhile Scirpus validus Vahl has a strong absorption and enrichment capacity to pentachlorophenol and polybrominated diphenyl ethers and / or deca-brominated diphenyl ether in the polluted sediment, and the root of Scirpus validus Vahl has enrichment capability to pentachlorophenol and deca-brominated diphenyl ether up to 2090 mu g kg<-1>dw and 200 mu g kg<-1>dw or above respectively; and Scirpus validus Vahl is an excellent remediation plant for the toxic organic pollutants in water environment sediment and is also a wetland emergent aquatic plant with aesthetic value.

Description

technical field [0001] The invention relates to the phytoremediation technology of polluted environment, in particular to a method for removing toxic organic pollutants in sediments by using aquatic plant water onion. Background technique [0002] With the rapid development of modern industry, many toxic organic pollutants that are difficult to decompose, such as polycyclic aromatic hydrocarbons, synthetic detergents, organochlorine pesticides, and brominated flame retardants, have been produced. These toxic organic pollutants have high toxicity, stable chemical properties, long residual time, are easily soluble in fat, have strong accumulation and are enriched in aquatic organisms. Their concentration can reach hundreds of thousands of times that in water, which not only affects the reproduction of aquatic organisms , and will endanger human health through the food chain. [0003] Polybrominated diphenyl ethers (PBDEs) are currently one of the most important brominated fla...

AI Technical Summary

Problems solved by technology

Pentachlorophenol (Pentachlorophenol, PCP) has been widely used as a pesticide and wood preservative in the world. Because of its broad-spectrum toxicity and mutagenicity to organisms, it is considered to be the main persistent organic pollutant (POPs) in the environment. And one of the priority monitoring pollutants, although it has basically stopped using it, there is still serious PCP soil and sediment pollution, and the presence of PCP has also been detected in surface water and groundwater environments

For the treatment of large-scale pollution, physical and chemical methods such as activated carbon adsorption, gas cleaning method, and incineration method are difficult to implement, cause great damage to the site environment, easily produce secondary pollution, and the cost of treatment is too high, so they are rarely used.

And persistent organic compounds are difficult to biodegrade, so the implementation effect is not good

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