The kinetics of the decomposition of 2,4,6-trichlorophenol by ozonation, by Fenton's reagent reaction, and by a polychromatic UV radiation is investigated from experiments performed in a batch reactor. In each oxidation system, the degree of removal of the organic compound from water is evaluated and the influence of the operating variables is established. The ozonation process is conducted at pH = 2 and in the presence of radical scavengers: In these conditions the kinetic constants and reaction orders for the direct reaction between ozone and that organic compound are deduced by using a model based in the film theory. The oxidation by Fenton's reagent (Fe2+ ion and H2O2), a generating system of hydroxyl radicals, leads to the evaluation of pseudo-first-order rate constants for the global reaction and to the determination of the kinetic constant for the direct radical reaction. Finally, the quantum yields in the photodecomposition process are determined from the rate equation, with the radiation flow rates absorbed previously calculated by means of a radiation source emission model.