Temperature-dependent change of light dose effects on E. coli inactivation during simulated solar treatment of secondary effluent
| Autor: | Antoni Escalas-Cañellas, Cesar Pulgarin, Stefanos Giannakis, Efthymios Darakas |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química, Universitat Politècnica de Catalunya. ENMA - Enginyeria del Medi Ambient |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Water--Purification--Disinfection
General Chemical Engineering Reciprocity law Regrowth Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua [Àrees temàtiques de la UPC] Dose vs. Intensity Industrial and Manufacturing Engineering Escherichia coli Dose effect MICROORGANISMS Irradiation Effluent SHIGELLA-FLEXNERI Escherichia coli (Bacteri) Chemistry INTENSITY Regeneració (Biologia) Applied Mathematics Environmental engineering E. coli SALMONELLA-TYPHIMURIUM General Chemistry Pulp and paper industry Solar disinfection Light dose Light intensity Factorial experimental design Regeneration (Biology) DARK STORAGE WATER-TREATMENT BACTERIA TIO2 Water treatment DISINFECTION SODIS Intensity (heat transfer) Aigua -- Depuració |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Recercat. Dipósit de la Recerca de Catalunya Universitat Jaume I |
| DOI: | 10.1016/j.ces.2014.12.045 |
| Popis: | In this study, simulation of solar disinfection of secondary effluents was performed, to assess the dose effects, as instructed by the reciprocity law. A full factorial experimental design on the operational parameters of the process was performed (Lime, temperature, bacterial load, light intensity) and three response variables were estimated (disinfection efficiency, regrowth after 24, and 48 h). In the 240 disinfection experiments, an erratic behavior was observed in all responses to light exposure, attributed to the combination of both irradiation intensity and temperature during treatment. As a result, the validity of the reciprocity law between light dose and irradiation intensity is challenged. The majority of the cases failed to comply with it, indicating the dependence on temperature conditions, as well as the applied intensity. Dose affected the bacterial regrowth potential after 24 and 48 h in a more conventional way. It appears that in order to attain a valid projection of the outcome of solar disinfection in secondary effluent, intensity and dose are not the only parameters to be considered, with temperature also having to be taken under consideration. (C) 2015 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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