Transport of free and particulate-associated bacteria in karst

Use of particulate surrogates for assessing microbial mobility in subsurface ecosystems

“…Scheibe et al (2007) concluded from field-scale experiments that adsorption rate is dependent on the hydraulic conductivity of the aquifer. Consequently, short travel times and the large fissure and conduit apertures encountered in many karst systems may provide limited attenuation by particle filtration and can permit bacteria to be transported over several kilometers, as observed by Mahler et al (2000).…”

“…While bacteria have been demonstrated to be highly mobile in saturated karstified media (Mahler et al 2000), the processes influencing attenuation that may arise in the overlying soil and epikarst layers remain poorly characterized. Heterogeneity and possible rapid recharge suggest karst environments may be susceptible to both natural and anthropogenic microbial input.…”

Two-dimensional numerical modeling of chemical transport–transformation in fluvial rivers: formulation of equations and physical interpretation

“…As sediment motion occurs ubiquitously in natural rivers, lakes and other surface water bodies, pollutants can be grouped into sediment-motion-related pollutants or (particulate-) sediment-associated pollutants (SAPs) and sediment-motion-non-related ones (Hart 1986;Huang 1993;Mahler et al 2000;Ellison & Brett 2006;Huang et al 2007b). The water temperature, which can be taken as typical of sediment-motion-non-related pollutants, has little to do with sediment motion.…”

“…The water temperature, which can be taken as typical of sediment-motion-non-related pollutants, has little to do with sediment motion. Heavy metals (Huang et al 2007b), organic chemicals, especially hydrophobic organic compounds (HOCs) (Mossman et al 1988;Allen-King et al 2002;Kim et al 2004), nutrients such as salts of nitrogen and phosphorus (Koelmans et al 2001), certain bacteria (Mahler et al 2000) and various kinds of oils (Khondaker 2000) Huang et al (2007a,b,c), to cite just a few. Partly due to the sediment transport effect, partly due to data scarcity in validating the numerical model, in which flow, sediment transport and transporttransformation of SAPs in fluvial rivers were simultaneously considered, numerical modeling of SAPs transport-transformation in fluvial rivers has been a challenging subject (Ziegler et al 2000).…”

Bacterial transport in porous media: New aspects of the mathematical model

“…Mahler et al [21] presented the results of an investigation of event-based bacterial contamination of a heterogeneous Karsh aquifer, focusing on the importance of sedimentassociated bacterial transport. Camesano and Logan [31] and Camesano et al [32] developed a filtration based model explicitly accounting for blocking that could be used to predict the effect of influent colloidal solute concentration on the deposition of colloids in porous media.…”