Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/46347
Title: The photocatalytic disinfection of urban waste waters
Authors: Herrera Melián, J. A. 
Doña Rodríguez, J. M. 
Viera Suárez, A.
Tello Rendón, E. 
Valdés Do Campo, C.
Arana, J. 
Pérez Peña, J. 
UNESCO Clasification: 330301 Tecnología de la catálisis
Keywords: Total coliforms
Streptococci
Photocatalysis
TiO2
Issue Date: 2000
Publisher: 0045-6535
Journal: Chemosphere 
Abstract: In this paper we present the results of the photocatalytic disinfection of urban waste water. Two microbial groups, total coliforms and Streptoccocus faecalis, have been used as indexes to test disinfection efficiencies. Different experimental parameters have been checked, such as the effect of TiO2, solar or UV-lamp light and pH. Disinfection of water samples has been achieved employing both UV-lamp and solar light in agreement with data shown by other authors. The higher disinfection rates obtained employing an UV-lamp may be explained by the stronger incident light intensity. Nevertheless no consistent differences have been found between TiO2-photocatalysis and direct solar or UV-lamp light irradiation at natural sample pH (7.8). At pH 5 the presence of TiO2 increases the relative inactivation rate compared with the absence of the catalyst. After the photocatalytic bacterial inactivation, the later bacterial reappearance was checked for total coliforms at natural pH and pH 5, with and without TiO2. Two h after the photocatalytic treatment, CFU increment was almost nill. But 24 and 48 h later an important bacterial CFU increment was observed. This CFU increment is slower after irradiation with TiO2 at pH 5 in non-air-purged samples.
URI: http://hdl.handle.net/10553/46347
ISSN: 0045-6535
DOI: 10.1016/S0045-6535(99)00502-0
Source: Chemosphere [ISSN 0045-6535], v. 41, p. 323-327
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