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(399e) Kinetics of Oxidation of Dyes In Effluents Using a Porous Electrode Ozonator



The generation of ozone involves the dissociation of molecular oxygen
into atomic oxygen radicals which in turn react with oxygen to form ozone
molecules. Depending on the voltage used, the corona discharge process may
generate in addition to ozone many short-lived species such as electrons,
negative ions such as O- and O2-, and hydroxyl
radicals. If an in situ ozone generator and reactor are used, it is possible to
utilize the ozone efficiently as it is formed along with the short-lived
species. This paper will present results from the study of a novel
porous electrode ozonator wherein the contaminated fluid flows through a porous
electrode tube around the periphery of which ozone is generated by corona
discharge.

Experimental studies
were conducted on ozone mass transfer and ozonation kinetics of a high molecular
weight organic compound (dye) in the porous electrode ozonator. The data
indicate that ozone mass transfer rate is an order of magnitude higher in the
porous electrode ozonator than conventional stirred tank ozonator. Ozonation
kinetics was analyzed using a model that takes into account simultaneous
absorption and reaction in the liquid film and reaction in the bulk fluid. This
paper will present experimental data and model simulations for the absorption and
reaction of ozone with contaminants in the flowing fluid.