Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/107486
Author(s): | Vitor Vilar Caio Silva Sandra Miranda Filipe Lopes Mário Silva Márcia Dezotti Adrian M T Silva Joaquim Luís Faria Rui Boaventura Eugenia Pinto |
Title: | Bacteria and fungi inactivation by photocatalysis under UVA irradiation: liquid and gas phase |
Issue Date: | 2017 |
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. |
Subject: | Tecnologia ambiental, Engenharia do ambiente Environmental technology, Environmental engineering |
Scientific areas: | Ciências da engenharia e tecnologias::Engenharia do ambiente Engineering and technology::Environmental engineering |
URI: | https://hdl.handle.net/10216/107486 |
Related Information: | info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/100554/2008/AIRPHOTOXI-DESTOXIFICAÇÃO SOLAR DE AR INTERIOR: BIOAEROSSÓIS E COVs/AIRPHOTOXI info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projetos Estratégicos/UID/EQU/50020/2013- POCI-01-0145-FEDER-006984/Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais/LSRE-LCM |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | restrictedAccess |
Appears in Collections: | FEUP - Artigo em Revista Científica Internacional FFUP - Artigo em Revista Científica Internacional |
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154606.pdf Restricted Access | 637.63 kB | Adobe PDF | Request a copy from the Author(s) |
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