Journal article
Sulfate Radical-Induced Disinfection of Pathogenic Escherichia coli O157:H7 via Iron-Activated Persulfate
Environmental science & technology letters, v 4(4), pp 154-160
11 Apr 2017
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Sulfate radical (SO4 center dot-) has been increasingly applied as an efficient oxidant for water treatment in recent years. This study investigated the disinfection efficacy of SO4- on Escherichia coli 0157:H7, i.e., a pathogenic strain of E. coli on the U.S. Environmental Protection Agency's Contaminant Candidate List. SO4 center dot- was generated via persulfate (S2O82-) activation using ferrous iron (Fe2+). Results showed that S2O82- activation and subsequent SO4 center dot- exposure induced the loss of pathogenic E. coli viability. The disinfection, kinetics exhibited an induction phase followed by a rapid first-order decay phase. Dosages of S2O82- and Fe2+ significantly impacted the duration of the induction phase and the rate of disinfection; on the other hand, the solution pH preferentially impacted the induction time, and the dosage of Fe3+ -reducing agent hydroxylamine (NH2OH) impacted the rate of disinfection. The disinfection kinetics depended on the CT equivalence of total SO4 center dot- exposure. Results showed that SO4 center dot- exposure initiated the loss of E. coli 0157:H7 cell viability 5 times faster than HO center dot exposure did. This unique feature of SO4 center dot- is possibly associated with its highly selective reactivity with electron-rich moieties on the surface of E. coli 0157:H7 cell membranes.
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Details
- Title
- Sulfate Radical-Induced Disinfection of Pathogenic Escherichia coli O157:H7 via Iron-Activated Persulfate
- Creators
- Dawit N. Wordofa - University of California, RiversideSharon L. Walker - University of California, RiversideHaizhou Liu - University of California, Riverside
- Publication Details
- Environmental science & technology letters, v 4(4), pp 154-160
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 7
- Grant note
- CHE-1611306 / National Science Foundation; National Science Foundation (NSF) Faculty Initiation Fund at the University of California (Riverside, CA)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000399269600007
- Scopus ID
- 2-s2.0-85017517074
- Other Identifier
- 991021230004004721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences