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Transport of Giardia and Manure Suspensions in Saturated Porous Media

^a USDA–ARS, George E. Brown Jr. Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507-4617
^b USDA–ARS, Environmental Microbial Safety Lab., Bldg. 173, Rm. 203, BARC–East Power Mill Rd., Beltsville, MD 20705

View larger version (26K): [in a new window]   Fig. 1. (a) Observed and simulated effluent concentration curves and (b) spatial distributions for manure suspension in 710-, 360-, 240-, and 150-µm sand. Simulations considered deposition according to Eq. [1] to [3] and corresponding model parameters are given in Table 2.

View larger version (29K): [in a new window]   Fig. 2. The cumulative size distribution (CSD) for manure effluent in the 710-, 360-, 240-, and 150-µm sands after 95 min. The CSD of the influent manure suspension is also shown in the figure for reference.

View larger version (70K): [in a new window]   Fig. 3. The cumulative size distribution (CSD) for manure effluent in the (a) 710-µm, (b) 360-µm, (c) 240-µm, and (d) 150-µm sands after 95, 145, 195, 245, and 295 min. The CSD of the influent manure suspension is also shown in the figures for reference.

View larger version (18K): [in a new window]   Fig. 4. (a) Observed and simulated effluent concentration curves and (b) spatial distributions for Giardia in the 710-, 360-, and 150-µm sands in the absence of manure suspension. Here simulations considered deposition according to Eq. [1] to [3] and corresponding model parameters are provided in Table 3.

View larger version (21K): [in a new window]   Fig. 5. (a) Observed and simulated effluent concentration curves and (b) spatial distributions for Giardia in the 710-, 360-, and 150-µm sands in the presence of manure suspension. Here simulations considered deposition according to Eq. [1] to [3] and corresponding model parameters are provided in Table 3.