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Straining and Attachment of Colloids in Physically Heterogeneous Porous Media

George E. Brown, Jr. Salinity Laboratory, USDA, ARS, 450 West Big Springs Road, Riverside CA 92507-4617

View larger version (22K): [in a new window]   Fig. 1. Simulated aqueous phase velocity distribution in the 710-µm matrix–360-µm lens system. A cross-section view from the column center (left) to the column boundary (right) is shown.

View larger version (15K): [in a new window]   Fig. 2. Observed and simulated (710-µm matrix–360-µm lens) effluent concentration curves of bromide in the indicated 710-µm matrix systems.

View larger version (17K): [in a new window]   Fig. 3. (a) The effluent concentration curves and (b) the final spatial distributions of 1.0-µm colloids in the indicated 710-µm matrix systems.

View larger version (15K): [in a new window]   Fig. 4. Observed and simulated (parameters for the attachment and straining models are given in Table 3) (a) effluent concentration curves and (b) the final spatial distributions of 1.0-µm colloids in the 710-µm matrix–360-µm lens system.

View larger version (17K): [in a new window]   Fig. 5. (a) The effluent concentration curves and (b) the final spatial distributions of 3.2-µm colloids in the indicated 710-µm matrix systems.

View larger version (15K): [in a new window]   Fig. 6. Observed and simulated (parameters for the attachment and straining models are given in Table 3) (a) effluent concentration curves and (b) the final spatial distributions of 3.2-µm colloids in the 710-µm matrix–360-µm lens system.

View larger version (24K): [in a new window]   Fig. 7. Simulated aqueous phase velocity distribution in the 710-µm lens–360-µm matrix system. A cross-section view from the column center (left) to the column boundary (right) is shown.

View larger version (16K): [in a new window]   Fig. 8. Observed and simulated (710-µm lens–360-µm matrix) effluent concentration curves of bromide in the indicated 710-µm lens systems.

View larger version (26K): [in a new window]   Fig. 9. (a) The effluent concentration curves and (b) the final spatial distributions of 1.0-µm colloids in the indicated 710-µm lens systems.

View larger version (22K): [in a new window]   Fig. 10. Observed and simulated (parameters for the attachment and straining models are given in Table 3) (a) effluent concentration curves and (b) the final spatial distributions of 1.0-µm colloids in the 710-µm lens–150-µm matrix system.

View larger version (17K): [in a new window]   Fig. 11. (a) The effluent concentration curves and (b) the final spatial distributions of 3.2-µm colloids in the indicated 710-µm lens systems.

View larger version (14K): [in a new window]   Fig. 12. Observed and simulated (parameters for the attachment and straining models are given in Table 3) (a) effluent concentration curves and (b) the final spatial distributions of 3.2-µm colloids in the 710-µm lens–150-µm matrix system.