AWWA WQTC69476

This powerpoint presentation begins by providing a brief overview of factors impacting microbial transport and fate in porous media. Microorganisms and surrogates studied included C. parvum oocysts, B. subtilis spores, and 4.5 µm microspheres. Experimental design included: 10cm and 20 cm length columns; column orientation - vertical and horizontal; media - composition: >99% silica, size range: ~0.2 - 1.2 mm, d50: 0.2 mm and 0.6 mm, and UC: 1.5 and 2.2; DOM: 0 mg/L and 5 mg/L; IS: 1mM and 100 mM KCl; and, Rates: 1 m/d, 10 m/d, 40m/d. Preliminary conclusions indicate the following: column design can impact observed microoganism and transport surrogate removals by filtration at water velocities < ~10 m/d; the presence of higher levels of NOM may counteract the impact of column orientation (further investigation required); and, ionic strength can impact observed microoganism and transport surrogate removals by filtration at water velocities < ~10 m/d. Includes figures.