The treatment of contaminants present in the oil-produced water must be carried out before the disposal according to the legislation. This paper presents the use of Advanced Oxidative Processes in the degradation of phenol in sea water, and in treatment of a real sample of oil-produced water (OPW). Two catalysts were used: TiO2 for photocatalysis-heterogeneous, and FeSO4.7H2O for the Photo-Fenton process. The pH variation of the effluent (in acid, neutral and alkaline) and the addition of traces of hydrogen peroxide, were evaluated. The results obtained show an efficiency in the removal of the phenolic compound in sea water in about 96%, under an hour of experiment, having the best behavior when the solution is in pH 3. Regarding to the real sample of OPW, it was observed that larger reductions of the absorption bands relative to organic matter, in both processes proposed in pH 3.