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Fig. 2. Plots of observed and simulated spatial distributions of Cryptosporidium oocyst retained in the (a) 710-µm, (b) 360-µm, and (c) 150-µm sands. Here the normalized concentration (No Nto–1) per gram of dry sand is plotted as a function of dimensionless depth (distance from column inlet divided by column length). Simulations considered attachment (Model-Att), attachment and detachment (Model-Att/Det), straining (Model-Str), and attachment, detachment, and straining (Model-Att/Det/Str). Corresponding oocyst effluent concentration curves are presented in Fig. 1. Fitted model parameters are presented in Table 2.
