Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bacteria and fungi inactivation by photocatalysis under UVA irradiation: liquid and gas phase

Full text
Author(s):
Rodrigues-Silva, Caio ; Miranda, Sandra M. ; Lopes, Filipe V. S. ; Silva, Mario ; Dezotti, Marcia ; Silva, Adrian M. T. ; Faria, Joaquim L. ; Boaventura, Rui A. R. ; Vilar, Vitor J. P. ; Pinto, Eugenia
Total Authors: 10
Document type: Journal article
Source: Environmental Science and Pollution Research; v. 24, n. 7, p. 6372-6381, MAR 2017.
Web of Science Citations: 10
Abstract

In the last decade, environmental risks associated with wastewater treatment plants (WWTPs) have become a concern in the scientific community due to the absence of specific legislation governing the occupational exposure limits (OEL) for microorganisms present in indoor air. Thus, it is necessary to develop techniques to effectively inactivate microorganisms present in the air of WWTPs facilities. In the present work, ultraviolet light A radiation was used as inactivation tool. The microbial population was not visibly reduced in the bioaerosol by ultraviolet light A (UVA) photolysis. The UVA photocatalytic process for the inactivation of microorganisms (bacteria and fungi, ATCC strains and isolates from indoor air samples of a WWTP) using titanium dioxide (TiO2 P25) and zinc oxide (ZnO) was tested in both liquid-phase and airborne conditions. In the slurry conditions at liquid phase, P25 showed a better performance in inactivation. For this reason, gas-phase assays were performed in a tubular photoreactor packed with cellulose acetate monolithic structures coated with P25. The survival rate of microorganisms under study decreased with the catalyst load and the UVA exposure time. Inactivation of fungi was slower than resistant bacteria, followed by Gram-positive bacteria and Gram-negative bacteria. (AU)

FAPESP's process: 14/16622-3 - Identification of intermediates formed during degradation of veterinary drugs by advanced oxidation processes
Grantee:Caio Alexandre Augusto Rodrigues da Silva
Support Opportunities: Scholarships in Brazil - Post-Doctoral