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Monitoring the post-irradiation E-coli survival patterns in environmental water matrices: implications in handling solar disinfected wastewater
Giannakis, Stefanos; Merino Gamo, Ana Isabel; Darakas, Efthymios; Escalas Cañellas, Antoni; Pulgarin, César
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. ENMA - Enginyeria del Medi Ambient
In this study, simulated solar disinfection of secondary effluent was followed by dark storage at different temperatures or different receiving water matrices. Escherichia coil illumination was followed by 3-day monitoring of the bacterial population and its adaptation in different temperature conditions in the dark. The subsequent survival was linked to the dose received during exposure to light, and results were obtained on the environmentally induced prolongation of survival, maintenance of population or excessive growth, at 4 degrees C, 20 degrees C and 37 degrees C, respectively. An additional set of experiments at 20 degrees C was subjected to dilution in E. coli-free synthetic wastewater, water from Lake Leman, (synthetic) seawater and Mili-Q water. Post-irradiation monitoring was also conducted, studying 50%, 10% and 1% dilution rates, and the results were attributed to the two parameters of dilution medium and dilution ratio. However, different responses were found based on the acquired dose during pre-treatment. This indicates the importance of the illumination prior to storage, and the preference of bacteria in some matrices over the others. Survival was linked to initial population, dose, dilution and medium; shorter illumination times are to be considered according to the receiving water matrix. (C) 2014 Elsevier B.V. All rights reserved.
Àrees temàtiques de la UPC::Enginyeria química::Impacte ambiental
Àrees temàtiques de la UPC::Enginyeria química::Química del medi ambient::Química de l'aigua
Escherichia coli
Sewage--Purification
Solar disinfection
E. coli survival
Environmental influence
Regrowth
Dilution
Aqueous matrices
FECAL INDICATOR BACTERIA
DRINKING-WATER
SALMONELLA-TYPHIMURIUM
ULTRAVIOLET DISINFECTION
SUNLIGHT INACTIVATION
SECONDARY EFFLUENT
ENTERIC BACTERIA
PLASTIC BOTTLES
DARK REPAIR
E. COLI
Escherichia coli (Bacteri)
Aigües residuals -- Depuració
info:eu-repo/semantics/publishedVersion
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