The purpose of this study is to investigate the treatability of electrocoagulated biodiesel wastewater (ECBD) by potassium permanganate (KMnO4) and potassium permanganate/ozone (KMnO4/O3) processes. The ECBD removal efficiencies of both combined method and KMnO4 methods were compared and the KMnO4/O3 process gave better results than the KMnO4 process. For the ECBD removal efficiencies, the experimental parameters including pH, potassium permanganate dose, ozone dose and reaction time parameters were optimized by changing the one parameter at a time. As a result of 6 h of KMnO4 oxidation, 91.74% of COD and 95.93% of MeOH removal was achieved under the optimum conditions (pH 2, 5 g/L KMnO4 dose). However, under optimum conditions (pH 13, 2 g/L KMnO4 dose, 3000 mg/L O3 dose, 6 h reaction time), the COD and MeOH removal efficiencies have been obtained for KMnO4/O3 as 97.79% and 98.30%, respectively. The second order kinetic model has been found to be the most suitable model for both processes and the regression coefficients (R2) has been found as 0.999 and 0.999 for KMnO4 and KMnO4/O3, respectively. The reaction rate constants (k) have been also calculated as 6x10-5 L/mg.min and 1.63x10-4 L/mg.min for COD and MeOH in KMnO4 oxidation, respectively. Furthermore, the reaction rate constants (k) have been also calculated as 6x10-5 L/mg.min and 1.6x10-4 L/mg.min for COD and MeOH in KMnO4/O3 oxidation, respectively.