INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
New kinetic modeling for water disinfection using commercial peracetic acid (PAA).
Autor/es:
FLORES MARINA; BRANDI RODOLFO; CASSANO ALBERTO; LABAS MARISOL
Lugar:
San Diego-California
Reunión:
Congreso; Advanced Oxidation Technologies for Treatment of Water, Air and Soil; 2014
Resumen:
Water disinfection is carried out to prevent the spread of human pathogens that may be present in wastewater effluents. The efficient removal of pathogenic bacteria, viruses and protozoan parasites from water and wastewaters is critical, since sewage discharges may increase the risks of waterborne infections. An ideal disinfection system should efficiently and reliably destroy infectious agents under normal operating conditions, without producing toxic disinfection by products. Peracetic acid commercial mixture finds increasing use, for disinfection proposal, in the recent years because of its relatively low cost and the confirmation beyond any doubt that after being used, it produces results that are never harmful to the environment. The equilibrium state of commercial peracetic acid is a mixture of peracetic (PAA) and acetic acids, as well as water and hydrogen peroxide (HP). The action of PAA and HP in the mixture can be attributed to oxido-reduction reactions and to the production of highly reactive radicals, above all the hydroxyl radical OH˙ originated by the cleavage of the peroxidic bond. Hydrogen peroxide plays different roles, being implied in the restoration of the equilibrium between the different species after consumption of PAA but also acting as an oxidizing biocide and catalyst itself. To study the synergism between de HP and PAA present in the commercial mixture, experiments were carried out using dilutions of the unmodified mixture, and the same composite but HP inhibited. Also, experimental tests were performed using only HP as disinfectant agent.