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Comparison of Escherichia coli and Campylobacter jejuni Transport in Saturated Porous Media

^a USDA-ARS, 230 Bennett Lane, Bowling Green, KY 42104
^b Department of Chemical and Environmental Engineering, University of California, Riverside, B355 Bourns Hall, Riverside, CA 92521

View larger version (22K): [in a new window]   Fig. 1. Removal efficiency for E. coli and C. jejuni in replicate 10-cm columns under the following conditions: uncoated quartz sand with 10 mM KCl, uncoated quartz sand with 1 mM KCl, Fe-coated sand with 10 mM KCl, and Al-coated sand with 10 mM KCl. Error bars represent one standard deviation of the mean.

View larger version (24K): [in a new window]   Fig. 2. Relative recovery of E. coli and C. jejuni from replicate 10-cm columns under the following conditions: uncoated quartz sand with 10 mM KCl, uncoated quartz sand with 1 mM KCl, Fe-coated sand with 10 mM KCl, and Al-coated sand with 10 mM KCl. Error bars represent one standard deviation of the mean.

View larger version (18K): [in a new window]   Fig. 3. Total interaction energy (Vtotal) as calculated with Derjaguin–Landau–Verwey–Overbeek (DLVO) theory as a combination of electrostatic double layer (VEDL) and van der Waals (VVDW) forces between E. coli and C. jejuni and the quartz sand surface at 10 mM KCl. Calculations assume sphere–plate interactions (Gregory, 1981; Hogg et al., 1966) and a Hamaker constant of 6.5 x 10–21 J (Redman et al., 2004), and utilized a zeta potential value for quartz previously reported (Walker et al., 2002).