Inactivation of Salmonella spp. from secondary and tertiary effluents by UV irradiation
Keller, R.; Passamani, F.; Vaz, L.; Cassini, S.T.; Gonçalves, R.F.
Water Science and Technology a Journal of the International Association on Water Pollution Research 47(3): 147-150
2003
ISSN/ISBN: 0273-1223 PMID: 12639020 Document Number: 559677
The aim of this study was to verify the efficiency of UV irradiation in the inactivation of Salmonella spp. in treated wastewater with different levels of turbidity and exposed to increasing doses of UV irradiation. Experiments were carried out in a batch reactor and in a real scale reactor. Salmonellae obtained from clinical samples were seeded into autoclaved wastewater collected from a wastewater treatment plant (WWTP) comprising an association of a UASB reactor followed by three submerged aerated biofilters (BAF) and one tertiary filter. The results showed that salmonellae were not inactivated in effluents from the UASB reactor indicating that the presence of suspended solids was an important obstacle to UV penetration in bacteria. However, UV irradiation was efficient in inactivating Salmonella of effluents from aerated secondary and tertiary biofilm reactors.