Journal article
Escherichia coli O157:H7 Transport in Saturated Porous Media: Role of Solution Chemistry and Surface Macromolecules
Environmental science & technology, v 43(12), pp 4340-4347
15 Jun 2009
PMID: 19603644
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The transport and deposition behavior of Escherichia coli O157: H7 was investigated in saturated packed-bed columns and micromodel systems over a range of ionic strength (IS) (1, 10, and 100 mM) and pH (5.8, 8.4, and 9.2) conditions. At a given IS, elevated solution pH resulted in decreased deposition as a result of the increase in the measured zeta potential of the quartz sand. This deposition trend was consistent with predictions from classic Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Conversely, the E coli O157:H7 deposition was inversely proportional to IS(1-100mM) at high pH conditions (8.4 and 9.2), whereas no effect of IS was observed at pH 5.8. This deposition trend was not consistent with DLVO theory, but could be explained by pH-associated electrosteric stabilization. This phenomenon is driven by the pH-dependent protonated state of functional groups on E coli O157:H7 surface macromolecules and the corresponding conformational state of the bacterial polymers. Results from this study demonstrate that retention of E coli O157:H7 cells in porous media is a complex process that depends on the solution chemistry, cell-cell interactions, and pore structure. The findings in this study also imply that previous work conducted at lower pH and IS conditions may underestimate E coli O157:H7 travel distance in higher salt and pH groundwater environments.
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Details
- Title
- Escherichia coli O157:H7 Transport in Saturated Porous Media: Role of Solution Chemistry and Surface Macromolecules
- Creators
- Hyunjung N. Kim - Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USAScott A. Bradford - U.S. Salinity LaboratorySharon L. Walker - University of California, Riverside
- Publication Details
- Environmental science & technology, v 43(12), pp 4340-4347
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 8
- Grant note
- 2006-02541 / USDA; United States Department of Agriculture (USDA)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000266968500021
- Scopus ID
- 2-s2.0-67449128247
- Other Identifier
- 991021229893304721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences