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    Continuous extraction and destruction of chloro-organics in wastewater using ozone-loaded Volasil (TM) 245 solvent

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    Publication date
    2005
    Author
    Tizaoui, Chedly
    Slater, M.J.
    Ward, D.B.
    Keyword
    Indirect ozonation
    Chloro-organics
    Ozone
    Wastewater treatment
    Liquid¿liquid extraction
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Extracting waterborne contaminants to ozone-loaded Volasil¿245 (a siloxane solvent in which ozone is ten times more soluble than water) has been studied as a means of enhancing reaction kinetics and thus, providing more rapid wastewater decontamination. Investigation was carried out with respect to 2-chlorophenol and dichloromethane. Using a pilot scale continuous flow liquid¿liquid/ozone water treatment system, 2-chlorophenol was extracted to the ozone-loaded solvent phase and considerable extents of destruction were achieved. However, the approach was demonstrated to yield slightly less destruction than direct gas contact for the same utilization of ozone and enhanced reaction kinetics were not shown to occur. This was suggested to be due to increased interfacial mass transfer resistance and/or the promotion of less destructive reaction pathways. Modification of the existing pilot system, by conversion from co- to counter-current solvent-loading, enabled greater dissolved ozone concentrations to be achieved within the solvent. Increasing the counter-current exchange column height to not, vert, similar2.5 m was suggested for achieving a near optimum level of performance. The liquid¿liquid/ozone approach was demonstrated to be an effective means of indirectly exposing wastewater contaminants to concentrated ozone. As such the technology may be applicable as an alternative to direct gas contact in instances where the avoidance of contaminant sparging is desired (i.e. where contaminants are highly volatile, pungent and/or toxic) or foaming occurs
    URI
    http://hdl.handle.net/10454/3140
    Version
    No full-text available in the repository
    Citation
    Tizaoui, C., Slater, M.J. and Ward, D.B. (2005). Continuous extraction and destruction of chloro-organics in wastewater using ozone-loaded Volasil (TM) 245 solvent. Journal of Hazardous Materials. Vol. 125, Nos. 1-3, pp. 65-79.
    Link to publisher’s version
    http://dx.doi.org/10.1016/j.jhazmat.2005.01.002
    Type
    Article
    Collections
    Engineering and Informatics Publications

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