| Abstract
| - The broadband UV irradiation of 1.1 mM trichloroethene(TCE) aqueous solution in the presence of 10.4 mM H2O2resulted in formic, oxalic, dichloroacetic (DCA), andmonochloroacetic (MCA) acids, as organic byproducts.The organic chlorine was converted completely to chlorideion as a final product. TCE and its degradation productswere completely mineralized in 30 min, under a volume-averaged UV−C irradiant power of 35.7 W/L from a 1kW medium-pressure mercury vapor arc lamp. TCE degradedprimarily through hydroxyl radical-induced reactions andonly to a low extent through direct UV photolysis and chlorineatom-induced chain reactions. The experimental patternsof TCE, H2O2, and detected reaction products combined withthe literature information on radical reactions in theaqueous phase were used to postulate a degradationmechanism and to develop a kinetic model to predict theTCE decay, formation and degradation of byproducts,and pH and oxygen profiles. The agreement between themodel calculations and the experimental data is satisfactory.
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