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Ultrasonic repair PAHs Contaminated Soil

Author: SongWeiKun
Tutor: LiJianBing
School: North China Electric Power University (Beijing)
Course: Environmental Engineering
Keywords: Ultrasonic wave Adsorption Soil Remediation PAHs
CLC: X53
Type: Master's thesis
Year: 2011
Downloads: 87
Quote: 1
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Abstract


Polycyclic aromatic hydrocarbons (PAHs) because of its potential toxicity and carcinogenicity Teratogenicity , the natural environment and human health caused great threat. The ultrasonic oxidation technology as an advanced oxidation technology , can effectively degradation and mineralization of refractory organic pollutants . In this thesis, using self-designed experimental apparatus ultrasonic treatment to phenanthrene, anthracene as representative polycyclic aromatic hydrocarbons, PAHs studied the ultrasonic treatment of contaminated soil factors. Soil adsorption experiments showed that adsorption of phenanthrene meet linear isotherm model and Freundlich isotherm model . Soil physical and chemical properties of soil particles on the phenanthrene adsorption has an important influence . Soil physical and chemical properties such as particle size and organic matter content of different soil types can cause differences between PAHs removal . Ultrasonic power increases you can increase the removal of PAHs in soil . Selected four factors , the initial concentration of PAHs , sonication time , the pH value and flow rate , the orthogonal experiments . Orthogonal analysis of variance showed that the initial concentration of PAHs , sonication time and the flow rate on the removal of PAHs in the soil have a significant effect . Ultrasonic treatment time and increase the flow rate can be increased to some extent the removal of PAHs . With respect to two different PAHs, soil removal than phenanthrene anthracene removal , which may be due to non-linear arrangement of benzene phenanthrene and anthracene result Phoebe to stabilize . According to the water storage tank solution sample spectrum analysis by GC showed that by ultrasonic cavitation effect induced mechanical , thermal and chemical effects , soil particles of phenanthrene , anthracene contaminants are desorbed into the solution, and place a further degradation . Kinetic analysis showed that ultrasound repair PAHs contaminated soil reaction meet a response. For different soil types and different types of organic pollutants , the reaction rate constants were significantly different .

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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