Journal article
Lack of Influence of Extracellular Polymeric Substances (EPS) Level on Hydroxyl Radical Mediated Disinfection of Escherichia coli
Environmental science & technology, v 46(1), pp 241-249
03 Jan 2012
PMID: 22082030
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Photolysis of nitrate, a prevalent constituent in agriculturally impacted waters, may influence pathogen attenuation in such systems through production of hydroxyl radical ((OH)-O-center dot). This study focuses on the efficacy of (OH)-O-center dot generated during nitrate photolysis in promoting E. coli die-off as a function of extracellular polymeric substances (EPS) coverage. EPS levels of four E. coli isolates were systematically altered through a sonication extraction method and photochemical batch experiments with a solar simulator examined isolate viability loss as a function of time in nitrate solutions. E. coli viability loss over time exhibited two regimes: an initial induction time, t(s), with little decay was followed by rapid exponential decay characterized by a first-order disinfection rate constant, k. Increasing steady-state (OH)-O-center dot concentrations enhanced E. coli viability loss, increasing values of k and decreasing t(s) values, both of which were quantified with a multitarget bacterial disinfection model. Notably, at a given steady-state (OH)-O-center dot concentration, values of t(s) and k were independent of EPS levels, nor did they vary among the different E. coli strains considered. Results herein show that while (OH)-O-center dot generated via nitrate photolysis enhances rates of disinfection in surface water, the mechanism by which (OH)-O-center dot kills E. coli is relatively insensitive to common bacterial variables.
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Details
- Title
- Lack of Influence of Extracellular Polymeric Substances (EPS) Level on Hydroxyl Radical Mediated Disinfection of Escherichia coli
- Creators
- Amy S. Gong - University of California, RiversideCaylyn A. Lanzl - University of IowaDavid M. Cwiertny - University of IowaSharon L. Walker - University of California, Riverside
- Publication Details
- Environmental science & technology, v 46(1), pp 241-249
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 9
- Grant note
- 2008-01768 / USDA CSREES NRI; United States Department of Agriculture (USDA); National Institute of Food and Agriculture P200A060047 / U.S. Department of Education GAANN; US Department of Education P031C080183-09 / United States Department of Education, College Cost and Reduction Access Act, Hispanic Serving Institutions DBI-0731660 / MY BEST@UCR
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000298762900034
- Scopus ID
- 2-s2.0-84855302920
- Other Identifier
- 991021229981304721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences