Advanced Oxidation Technologies for water disinfection: UV and PAA combined treatment

FLORES MARINA; CASSANO ALBERTO; LABAS MARISOL

Florida

Congreso; 18th The international Conference on Advanced Oxidation Technologies for treatment of Water, Air and Soil; 2012

Redox Technologies

Human society requires water for drinking, sanitation, cleaning, production of food and energy, and support of commercial and industrial activities. In the latest advances in water purification and disinfection, mainly in the oxidation of toxic organic compounds, persistent and cumulative, are used the new technologies of Advanced Oxidation Process (APOs), which are methods that involved chemical or photochemical generation and use of species transitional powerful as the hydroxyl radical (OH˙). A new alternative for water disinfection is commercial peracetic (PAA). PAA based product consist of equilibrium mixtures of peracetic acid (25%v/v), hydrogen peroxide(20%v/v),acetic acid (15%v/v) and water (40%v/v). PAA disinfection produce no or only a low amount of DBPs into effluents, witch is one of its maims benefits. The biocide action of PAA and H2O2 can be attributed to the production of highly reactive radicals, above all the hydroxyl radical OH originated by the cleavage of the peroxidic bond. Furthermore, intracellular PAA may also oxidize essential enzymes;thus vital biochemical pathways, active transport across membranes, and intracellular solute levels are impaired. In this study we investigated the disinfection efficiencies of peracetic acid and UVC against Escherichia coli in laboratory scale study.