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Transport of Escherichia coli in Sand Columns with Constant and Changing Water Contents

Department of Environmental Sciences, Clark Hall, Univ. of Virginia, Charlottesville, VA 22903

View larger version (29K): [in a new window]   Fig. 1. Schematic diagram of the experimental apparatus

View larger version (31K): [in a new window]   Fig. 2. Relative cell concentrations in six suspending solutions during saturated transport

View larger version (25K): [in a new window]   Fig. 3. Relative Br- and cell concentrations, model fits, and water contents for the two saturated columns (a and b). There are two horizontal axes: pore volumes (lower) and time (upper). At the end of the saturated flow period inflow was stopped while outflow continued, resulting in a sharp drop in . After this point (indicated by the vertical line) the pore volume axis is not applicable

View larger version (25K): [in a new window]   Fig. 4. Relative Br- and cell concentrations, model fits, and water contents for the two constant unsaturated flow columns (a and b). The average residence time for one pore volume was 6.00 h for Column A and 7.83 h for Column B

View larger version (35K): [in a new window]   Fig. 5. Relative Br- and cell concentrations and water contents for the two variable unsaturated flow columns (a and b). The average residence time for one pore volume was 8.13 h for Column A and 11.9 h for Column B. Both columns had 12-h cycles of inflow, but the pore volumes per cycle differed between columns due to differences in flow rate and water content (Table 1)