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Extraction and destruction of organics in wastewater using ozone-loaded solvent

By Chedly Tizaoui, M.J. Slater and D.B. Ward


NoOriginally developed as a heat exchange fluid, Volasil 245 (decamethylcyclopentasiloxane) has been found to dissolve 10 times more ozone than water does. This article proposes and investigates the extraction of wastewater contaminants to ozone-loaded Volasil 245 as a means of providing rapid treatment. In a series of bench-scale tests, the effectiveness of ozone-loaded Volasil 245 contact was compared with that of conventional gas contact. Tests were conducted with respect to a range of organic compounds: namely, phenol, 2-chlorophenol, 2,3-dichlorophenol, 1,3-dichlorobenzene, o-nitrotoluene, and nitrobenzene. Contact with the ozone-loaded solvent was suggested to be the more rapid technique, reducing aqueous concentrations by at least 85% within 30 s. In the case of 2-chlorophenol, Volasil 245 contact was shown to require just ~0.5 min to achieve a residual aqueous fraction of 5%, as opposed to ~4.5 min of gas contact. However, water/solvent interfacial mass transfer resistance was suggested to limit the degree of aqueous decontamination ultimately achieved

Topics: Ozone, Wastewater treatment, Solvent extraction, Volasil 245, Polydimethylsiloxane, Ozone-loaded solvent, Chlorinated organics, Nitroaromatics
Year: 2004
DOI identifier: 10.1080/01919510490507801
OAI identifier:
Provided by: Bradford Scholars
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