On the other hand, if the experiment was performed without a catalyst (EO-H2O2), the COD decay reached 67% after 180 min under an applied current density of 50 mA cm2, due to the action of hydroxyl radicals generated on the BDD surface and the oxidative capacity of the electro-generated hydrogen peroxide. Through EF, a COD abatement of 80% occurred under an applied current density of 30 mA cm2 because in EF, hydroxyl radicals are formed at the BDD anode and in the bulk of the solution.