Removal of perfluorooctanoic acid and perfluorooctane sulfonate via ozonation under alkaline condition

► PFOA and PFOS are degraded by O3 or O3/H2O2 treatment at pH 11. ► Degradation of PFOA and PFOS by O3 or O3/H2O2 under alkaline condition is enhanced when the compounds are pretreated by 15 min of ozonation at ambient pH (4-5). ► PFOA and PFOS removal by O3 or O3/H2O2 at pH 11 was efficient relative to existing methods in terms of energy and contact time.