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Inactivation and regrowth of multidrug resistant bacteria in urban wastewater after disinfection by solar-driven and chlorination processes

Fiorentino, Antonino, Ferro, Giovanna, Alferez, María Castro, Polo-López, Maria Inmaculada, Fernandez-Ibanez, Pilar and Rizzo, Luigi (2015) Inactivation and regrowth of multidrug resistant bacteria in urban wastewater after disinfection by solar-driven and chlorination processes. Journal of Photochemistry and Photobiology B: Biology, 148 . pp. 43-50. [Journal article]

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URL: http://dx.doi.org/10.1016/j.jphotobiol.2015.03.029

DOI: doi:10.1016/j.jphotobiol.2015.03.029

Abstract

Solar disinfection and solar-driven advanced oxidation processes (AOPs) (namely H2O2/sunlight,TiO2/sunlight, H2O2/TiO2/sunlight, solar photo-Fenton) were evaluated in the inactivation of indigenousantibiotic-resistant bacteria (ARB) in real urban wastewater. A multidrug resistant (MDR) Escherichia colistrain isolated from the effluent of the biological process of an urban wastewater treatment plant was thetarget ARB. The higher inactivation rates (residual density under detection limit, 2 CFU mL�1) wereachieved with H2O2/TiO2/sunlight (cumulative energy per unit of volume (QUV) in the range 3–5 kJ L�1,depending on H2O2/TiO2 ratio) and H2O2/sunlight (QUV of 8 kJ L�1) processes. All investigated processesdid not affect antibiotic resistance of survived colonies. Moreover, H2O2/sunlight was compared with conventional chlorination process to evaluate bacterial regrowth potential and particularly the proportion ofindigenous MDR E. coli with respect to total indigenous E. coli population. Chlorination (1.0 mg Cl2 L�1)was more effective than H2O2/sunlight (50 mg H2O2 L�1) to achieve total inactivation of MDR E. coli(15 min Vs 90 min) but less effective in controlling their regrowth (24 h Vs 48 h). Interestingly, the percentageof MDR E. coli in H2O2/sunlight treated samples decreased as incubation time increased; theopposite was observed for chlorinated samples.

Item Type:Journal article
Keywords:E. coli; Advanced Oxidation Processes; photocatalysis; photo-Fenton
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:36778
Deposited By: Dr Pilar Fernandez-Ibanez
Deposited On:15 Feb 2017 13:59
Last Modified:15 Feb 2017 13:59

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