Abstract
Oxidation of organic micropollutants in water is significantly faster with ozone in combination with ultraviolet radiation than one would predict on the basis of the individual processes involved. A formalism for the analysis of O/sub 3//UV kinetics is presented in which substrate decay is represented as a linear combination of terms representing purging, ozonation, photolysis, and photolytic ozonation (O/sub 3//UV). For the substrate tetrachloroethylene (TCE) the process is overall first order in TCE. With a continuously sparged stirred tank reactor, times for the elimination of 63% of the substrate (T/sub 1/) have values of 100, 26, 20, and 7 min for purging, ozonation only, photolysis only, and photolytic ozonation, respectively. Significant retardation of O/sub 3//UV kinetics is observed in a lake-water matrix as opposed to purified water, possible due to a radical intermediate involved in the O/sub 3//UV process.
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