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The Effect of Different Particle Size from PAHs Contaminated Sediment by Ultrasonic Irradiation
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 Title & Authors
The Effect of Different Particle Size from PAHs Contaminated Sediment by Ultrasonic Irradiation
Na, Seung-Min; Khim, Jee-Hyeong; Cui, Ming-Can; Ahn, Yun-Gyong; Weavers, Linda K.;
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Sediments of Little Scioto (LS) River in Ohio was contaminated by poor disposal of creosote from Baker Wood Creosoting Facility. Among the primary compounds of creosote, Polycyclic Aromatic Hydrocarbons (PAHs) are the most common ingredient PAHs are known for toxic, carcinogenic and mutagenic compounds. There are many difficulties to remove the PAHs in nature environment because their characteristics are having a less water-solubility, volatile and low mobility properties as increasing the molecular weight. The generation of hydroxyl radicals () and hydrogen peroxide () forms as well as high temperature (5000 K) and pressure (1000 atm) by a physico-chemical effects of ultrasound during a cavitation collapse can promote the degradation and desorption of PAHs in sediment And it can also produces shock wave and microjets which are able to change the size and surface of particle in solid-liquid system as one of physical effects. Therefore, we explored to understand the role of particle size, the effect of elimination for PAHs concentration by ultrasound and optimize the conditions for ultrasonic treatment. The condition of various size of particles (> , < ) and solid-liquid ratio (12.5g/L, 25g/L) for the treatment was considered and ultrasonic power (430 W/L) with liquid - hexane extraction and microwave extraction method were applied after ultrasound treatment.
Ultrasound;PAHs;Sediment;Particle size;Liquid-hexane extraction;Microwave extraction;
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