Inactivation of Salmonella spp. from secondary and tertiary effluents by UV irradiation

• Published in: Water Science & Technology Vol. 47; no. 3; pp. 147 - 150
• Main Authors: KELLER, R, PASSAMANI, F, VAZ, L, CASSINI, S. T, GONCALVES, R. F
• Format: Conference Proceeding Journal Article
• Language: English
• Published: London IWA 01.01.2003; IWA Publishing
• Subjects: Aeration; Air. Soil. Water. Waste. Feeding; Applied sciences; Autoclaves; Autoclaving; Bacteria; Batch reactors; Biofilms; Biofilters; Biological and medical sciences; Bioreactors; Deactivation; Effluents; Environment. Living conditions; Exact sciences and technology; General purification processes; Inactivation; Irradiation; Medical sciences; Pollution; Public health. Hygiene; Public health. Hygiene-occupational medicine; Reactors; Salmonella; Salmonella - pathogenicity; Suspended particulate matter; Suspended solids; Turbidity; Ultraviolet radiation; Ultraviolet Rays; Waste Disposal, Fluid; Wastewater; Wastewater treatment; Wastewater treatment plants; Wastewaters; Water Microbiology; Water Purification - methods; Water treatment and pollution; Salmonella; Ultraviolet radiation; Pathogenic; Bacteria; Disinfection; Tertiary purification; Waste water purification; Inactivation; Enterobacteriaceae
• ISBN: 9781843394358; 1843394359
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2003.0186

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.