HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Gargiulo, G. Articles by Klumpp, E. Search for Related Content PubMed Articles by Gargiulo, G. Articles by Klumpp, E. GeoRef GeoRef Citation Agricola Articles by Gargiulo, G. Articles by Klumpp, E. Related Collections Microorganisms Microbial Processes Microbial and Colloid Transport Models

Bacteria Transport and Deposition under Unsaturated Flow Conditions: The Role of Water Content and Bacteria Surface Hydrophobicity

^a Agrosphere (ICG-IV), Institute of Chemistry and Dynamics of the Geosphere (ICG), Forschungszentrum Jülich GmbH D-52425, Jülich, Germany
^b USDA-ARS, US Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507-4617
^c Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521

View larger version (24K): [in this window] [in a new window]   FIG. 1. Schematic of the column experiment setup.

View larger version (66K): [in this window] [in a new window]   FIG. 2. Photograph of log phase (A) Deinococcus radiodurans and (B) Rhodococcus rhodochrous when suspended in 10–4 M phosphate buffer saline. The photographs were taken using an epifluorescent microscope.

View larger version (14K): [in this window] [in a new window]   FIG. 3. (A) Measured and fitted breakthrough curves and (B) retention profiles for Deinococcus radiodurans at 100% saturation. Fitted curves were obtained using the attachment model, the Langmuirian model, and the 2 site model. In Fig. 3A, 127 min is equal to 1 pore volume. C/C0 = relative effluent concentration, where C0 is the influent concentration of bacteria; Nt, number of bacteria recovered in the sand; Ni, number in a unit volume of the input bacterial suspension.

View larger version (15K): [in this window] [in a new window]   FIG. 4. (A) Measured and fitted breakthrough curves and (B) retention profiles for Deinococcus radiodurans at 80% saturation. Fitted curves were obtained using the attachment model, the Langmuirian model, and the 2 site model. In Fig. 4A, 101 min is equal to 1 pore volume. C/C0 = relative effluent concentration, where C0 is the influent concentration of bacteria; Nt, number of bacteria recovered in the sand; Ni, number in a unit volume of the input bacterial suspension.

View larger version (16K): [in this window] [in a new window]   FIG. 5. (A) Measured and fitted breakthrough curves and (B) retention profiles for Deinococcus radiodurans at 40% saturation. Fitted curves were obtained using the attachment model, the Langmuirian model, and the 2 site model. In Fig. 5A, 55 min is equal to 1 pore volume. C/C0 = relative effluent concentration, where C0 is the influent concentration of bacteria; Nt, number of bacteria recovered in the sand; Ni, number in a unit volume of the input bacterial suspension.

View larger version (15K): [in this window] [in a new window]   FIG. 6. (A) Measured and fitted breakthrough curves and (B) retention profiles for Rhodococcus rhodochrous at 100% saturation. Fitted curves were obtained using the attachment model, the Langmuirian model, and the 2 site model. In Fig. 6A, 134 min is equal to 1 pore volume. C/C0 = relative effluent concentration, where C0 is the influent concentration of bacteria; Nt, number of bacteria recovered in the sand; Ni, number in a unit volume of the input bacterial suspension.

View larger version (14K): [in this window] [in a new window]   FIG. 7. (A) Measured and fitted breakthrough curves and (B) retention profiles for Rhodococcus rhodochrous at 80% saturation. Fitted curves were obtained using the attachment model, the Langmuirian model, and the 2 site model. In Fig. 7A, 152 min is equal to 1 pore volume. C/C0 = relative effluent concentration, where C0 is the influent concentration of bacteria; Nt, number of bacteria recovered in the sand; Ni, number in a unit volume of the input bacterial suspension.

View larger version (15K): [in this window] [in a new window]   FIG. 8. (A) Measured and fitted breakthrough curves and (B) retention profiles for Rhodococcus rhodochrous at 40% saturation. Fitted curves were obtained using the attachment model, the Langmuirian model, and the 2 site model. In Fig. 8A, 62 min is equal to 1 pore volume. C/C0 = relative effluent concentration, where C0 is the influent concentration of bacteria; Nt, number of bacteria recovered in the sand; Ni, number in a unit volume of the input bacterial suspension.

View larger version (18K): [in this window] [in a new window]   FIG. 9. Illustration of a triangular-shaped capillary tube under saturated and unsaturated conditions. Potential straining sites are indicated in this figure where multiple interfaces intersect (at the air–water–solid triple point and the vertices of the triangular capillary tube).

View larger version (18K): [in this window] [in a new window]   FIG. 10. A plot of the relative water flux to straining sites (qws/qw; where qws and qw are the Darcy water velocities to straining sites and the porous medium at a given water saturation, respectively) for various hypothetical fractions of the pore space where straining occurs () and the indicated water saturations (Sw).