| Title: | "Laboratory batch experiments of the combined effects of ultrasound and air stripping in removing CCl4 and 1,1,1-TCA from water" |
| Author(s): | Ayyildiz O; Anderson PR; Peters RW; |
| Address: | "Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA. ayyiond@iit.edu" |
| DOI: | 10.1016/j.jhazmat.2004.12.026 |
| ISSN/ISBN: | 0304-3894 (Print) 0304-3894 (Linking) |
| Abstract: | "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" |
| Keywords: | "Air Carbon Tetrachloride/chemistry/*isolation & purification Solvents Trichloroethanes/chemistry/*isolation & purification Ultrasonics Water Pollutants, Chemical/*isolation & purification Water Purification/*methods;" |
| Notes: | "MedlineAyyildiz, Onder Anderson, Paul R Peters, Robert W eng Research Support, U.S. Gov't, Non-P.H.S. Netherlands 2005/04/07 J Hazard Mater. 2005 Apr 11; 120(1-3):149-56. doi: 10.1016/j.jhazmat.2004.12.026" |
