AWWA WQTC71547

This powerpoint presentation begins by providing study objectives that included: evaluation of experimental conditions and reproducibility when conducting pathogen transport investigations; assessment of the concurrent effects between parameters that impact pathogen transport in porous media; and, investigation of the surface characteristics and size of particles and the effects on transport outcomes. Parameter values for the factorial design mechanistic study are presented, along with experimental conditions for column studies, colloid and pathogen analysis, and experimental apparatus. Conclusions indicate that: for the bromide tracer tests there was no observable difference between two uniformity coefficient values, and observed results are attributable to factors studied rather than experimental errors eg. column packing; excellent repeatability in breakthrough curves obtained between duplicate columns and repeated experiments; factorial design permits us to compare the concurrent effects, not only for physicochemical parameters of the media/matrix, but also between different colloids; increased ionic strength results in higher levels of removal in porous media; and, impacts of grain size and uniformity coefficient are confounded with the effects of other parameters. Includes 2 references, table, figures.