Click on “Download PDF” for the PDF version or on the title for the HTML version.


If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Kinetic Model for E. coli Transport through Sand Column

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032151,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14019) @2003
Authors:   Lin Wang, Kyle R. Mankin, George L. Marchin
Keywords:   Second-order model, one-dimension convection-dispersion equation, grain size

A kinetic second-order model coupled with the one-dimension convection-dispersion equation (CDE) was used to describe E. coli transport through 20 cm sand columns. The kinetic second-order model along with the CDE was solved numerically by a Lax-Wendroff scheme. E. coli (strain B) in NaCl (0.85%) solution transport through coarse sand (> 1 mm and <2 mm) was compared with that of finer sand (>2 m and = 1 mm), under a flow velocity 0.05 mm/s and a cell concentration of 107 cfu/mL. The model fitted coarse sand better than that of finer sand. The model fitting efficiency of 91% for the coarse sand column and 61% for the finer sand column was attained. A total of 97% E. coli moved through the coarse sand column whereas only 67% passed through the fine column. The most likely mechanism is physical entrapment of the bacteria (1 m dia. by 2 m length) within the media. From this study, it appears media particle size plays a major role in E. coli transport under a saturated flow condition.

(Download PDF)    (Export to EndNotes)