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    Laboratory batch experiments of the combined effects of ultrasound and air stripping in removing CCl4 and 1,1,1-TCA from water
    (Elsevier Science Bv, 2005) Ayyildiz, O; Anderson, PR; Peters, RW
    Ultrasonic and air-stripping techniques for removal of carbon tetrachloride (CCl4) and 1,1,1-trichloroethane (1,1,1-TCA) from water were studied in batch experiments. Ultrasound (US) is effective for destroying organic compounds in aqueous solutions whereas air stripping (AS) efficiently transfers volatile compounds from the liquid to the gas phase. In simultaneous US and AS experiments, synergistic effects were observed and attributed to the effect of US on the mass transfer process. Using a photographic method, ultrasonic break up of gas bubbles and changes in gas holdup ratios were examined. In the two different gas-sparging systems studied, ultrasonic waves did not break up gas bubbles. In contrast, bubbles from the smaller porous size diffuser were coalesced due to sonication. In addition, both photographic and gas holdup experiments demonstrated that ultrasonic irradiation increased the gas holdup ratio. The enhancement observed in the removal of the compounds appeared to be due to this greater ultrasonic gas holdup ratio. (c) 2005 Elsevier B.V. All rights reserved.
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    Synergy of combined sonication and vapor stripping treatment in the removal of PCE from water
    (Parlar Scientific Publications (P S P), 2004) Ayyildiz, O; Peters, RW
    Sonolytic-vapor stripping removal of perchloroethylene (PCE) from water was investigated in bench-scale batch experiments. Sonication is an advanced oxidation process, and its application in water treatment concerns the degradation of recalcitrant organic contaminants in aqueous solutions. Vapor stripping is a mass transfer process involving the removal of volatile organic compounds from liquid phase to gas phase. Experimental results in this study demonstrated that combining ultrasound (US) and vapor stripping (VS) simultaneously, the removal of PCE increased beyond the additive effect of US and VS treatments.