ELENA MADALINA POPESCU, OCTAV PANTEA, DANIELA GOLOGAN, RAMI DOUKEH HYDROGEN PEROXIDE AND PERACETIC ACID OXIDIZING POTENTIAL IN THE TREATMENT OF WATER Mixture based on peracetic acid and hydrogen peroxide is a more powerful oxidant than chlorine and chlorine dioxide. The reactivity of this oxidizing mixture with the polluting substances in the water: ammonium compounds, nitrites, iron, manganese, organic proteins is evaluated in this study. The results obtained after tasting this mixture, using various natural groundwater matrices shows an oxidation efficiency of over 90% of ammonium and nitrite content, between 40-70% of iron and 25-50% for manganese forms. The advantage of this oxidation mixture compared to thechlorine substances is that they do not form threehalomethane byproducts that have carcinogenic effect. Keywords: drinking water, hydrogen peroxide, peracetic acid, ammonium removal, underground water oxidation process.