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Use of Fenton-based oxidation processes for water and wastewater treatment supports the development of kinetic models capable of accurately simulating key species concentrations over time. A reaction sequence describing the oxidation of a simple organic, formic acid, is shown to accurately predict temporal changes in key species concentrations over a wide range of initial and operating conditions. Simulations of formic acid oxidation using a range of different initial concentrations of the Fenton reagents, FeII and H2O2, dosing regimes, and operating conditions, are helpful to determination of optimal parameters and operating conditions for contaminant decomposition. Investigators are cautioned, however, that use of the kinetic model to determine such parameters first requires a clear understanding of the oxidation pathway and byproducts of the organic compound being targeted.