Abstract
A kinetic second-order model coupled with the one-dimension convection-dispersionequation (CDE) was used to describe E. coli transport through 20 cm sand columns. The kineticsecond-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) wascompared with that of finer sand (>2 m and = 1 mm), under a flow velocity 0.05 mm/s and a cellconcentration of 107 cfu/mL. The model fitted coarse sand better than that of finer sand. The modelfitting 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 thefine column. The most likely mechanism is physical entrapment of the bacteria (1 m dia. by 2 mlength) within the media. From this study, it appears media particle size plays a major role in E. colitransport under a saturated flow condition.
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