Impact of Dissolved Organic Matter (DOM) on Parameter Sensitivity of a Kinetic Ozone Decomposition Model

Author： Audenaert W.T.M. Vandevelde M. Van Hulle S.W.H. Nopens I.

ISSN： 0191-9512

Source： Ozone: Science and Engineering, Vol.35, Iss.5, 2013-09, pp. : 338-349

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Abstract

Ozone decomposition in real water is often empirically modeled due to the system complexity. Mechanistic models, however, can be of great value in view of engineering applications. The high number of model parameters often restricts their applicability. In this study, sensitivity analyses were used to determine the most important elementary reactions from a kinetic model and to understand the reaction mechanism. Only seven of the 28 rate constants showed to impact ozone and hydroxyl radical concentrations. Mass-transfer related parameters were of major importance. Ozone decomposition was extremely sensitive to parameters involving dissolved organic matter (DOM) at very low scavenger levels implying that even in “ultrapure” water systems impurities should be considered. To increase the applicability of mechanistic ozonation models, simplification of the elementary radical scheme combined with a more detailed description of reactions involving DOM is needed.