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Sunlight Inactivation Rates of Wild-type, Mutant, and Wastewater-derived E. coli in the Presence and Absence of Iron Chelators and ROS Scavengers: Applied and Mechanistic Implications for SODIS

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Abstract:

Wastewater-derived E. coli were inactivated by sunlight in PET bottles more slowly than laboratory strains for unknown reasons. By contrast, alternative bottle materials and low-cost additives were found to accelerate the inactivation of laboratory-cultured cells. Evidence from chelator and mutant experiments supported a strong role of intracellular iron and reactive oxygen species in the inactivation of laboratory-cultured E. coli. It was also observed that laboratory strains cultured under iron-limiting conditions were inactivated more slowly than cells grown on iron-supplemented media. The implications of these findings for the fate of pathogens and indicator bacteria in engineered and environmental systems are discussed, and further work is proposed.

Keywords: E. coli; SODIS; iron; reactive oxygen; solar disinfection

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864709793848031

Publication date: January 1, 2009

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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