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Evaluating E. coli degradation using a rotatory disk photoreactor
Evaluación de la degradación de E. coli empleando un fotorreactor de discos rotatorios
DOI:
https://doi.org/10.15446/ing.investig.v27n3.14846Keywords:
photodegradation, E.coli, sol-gel, TiO2, photoreactor (en)fotodegradación, E.Coli, sol-gel, TiO2, fotorreactor (es)
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Degradation of the bacterium E. coli was studied using a rotatory disk photoreactor manufactured in stainless steel to ascertain this photoreaction system’s behavior in different operating conditions. The photoreactor was equipped with 6 black light bulbs (BLB) used as a source of UV light and fitted with 7 removable disks made of common frosted glass impregnated with TiO2 photocatalyzer which were coupled to a rotation system. TiO2 was impregnated on the disks using the sol-gel method varying molar precursor gel ratios. Abrasion resistance, disk adhesion and surface uniformity tests were carried out for selecting the film presenting the best characteristics. Bacterial photodegradation studies were carried out using the following variable parameters: the disks’ rotation speed, radiation intensity and the number of discs which were directly related to the concentration of photocatalyzer in the system. Up to 64.3% degradation was achieved in 4 hours using 7 disks, low intensity and low rotation speed.
Se realizó un estudio de la degradación de la bacteria E. Coli empleando un fotorreactor de discos rotatorios fabricado en acero inoxidable para conocer el comportamiento de este sistema fotorreaccionante bajo diferentes condiciones de operación. El fotorreactor está dotado de 6 lámparas de luz negra (BLB) utilizadas como fuente de luz UV y provisto de 7 discos desmontables de vidrio común esmerilado impregnados con el fotocatalizador TiO2 los cuales se encuentran acoplados a un sistema de rotación. La impregnación del TiO2 sobre los discos se realizó empleando el método sol-gel variando las relaciones molares de los precursores del gel, y se les realizaron pruebas de resistencia a la abrasión, adherencia a los discos y uniformidad en la superficie, para seleccionar la película que presentara las mejores características. Los estudios de fotodegradación de la bacteria se llevaron a cabo tomando como parámetros variables: la velocidad de rotación de los discos, la intensidad de radiación y el número de discos el cual está directamente relacionado con la concentración del fotocatalizador en el sistema. Se alcanzaron degradaciones de hasta 64.3% en 4 horas empleando 7 discos, intensidad baja y velocidad de rotación baja.
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Copyright (c) 2007 Gina María Hincapié Mejía, Juan Miguel Marín S., Luis Alberto Rios, Gloria Restrepo
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