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 Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (30) Citing Articles via Google Scholar Google Scholar Articles by Bradford, S. A. Articles by Bettahar, M. Search for Related Content PubMed PubMed Citation Articles by Bradford, S. A. Articles by Bettahar, M. Agricola Articles by Bradford, S. A. Articles by Bettahar, M. Related Collections Animal Waste Water Quality Microorganisms Microbial Processes Microbial and Colloid Transport Models

Straining, Attachment, and Detachment of Cryptosporidium Oocysts in Saturated Porous Media

^a USDA-ARS, George E. Brown Jr. Salinity Laboratory, 450 W. Big Springs Road, Riverside, CA 92507-4617
^b Parsons, 100 West Walnut Street, Pasadena, CA 91124

View larger version (19K): [in a new window]   Fig. 1. Plots of observed and simulated Cryptosporidium oocyst effluent concentration curves in the (a) 710-µm, (b) 360-µm, and (c) 150-µm sands. Here relative effluent concentrations (C Ci–1) are plotted as a function of pore volumes. Simulations considered attachment (Model-Att), attachment and detachment (Model-Att/Det), straining (Model-Str), and attachment, detachment, and straining (Model-Att/Det/Str). Corresponding spatial distributions of the retained oocysts in these sands are shown in Fig. 2. Fitted model parameters are presented in Table 2.

View larger version (20K): [in a new window]   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.

View larger version (23K): [in a new window]   Fig. 3. Predicted effluent concentrations curves (semi-log plot of relative effluent concentrations as a function of time) for oocysts in 710-µm sand at distances of 25, 50, and 100 cm from the inlet. Predictions were obtained using the attachment–detachment (Model-Att/Det) and the attachment–detachment–straining (Model-Att/Det/Str) conceptual models. Model parameters were determined by fitting (Table 2) to the experimental soil column data.