Scaling Bacterial Filtration Rates in Different Sized Porous Media
Publication: Journal of Environmental Engineering
Volume 122, Issue 5
Abstract
Aquifer sediments contain a wide distribution of particle sizes, but only a single collector diameter ( d ) can be used in a filtration equation. To establish a method for selecting a characteristic d when media are composed of different sized particles, we measured bacterial retention in columns packed with either crushed quartz sand (separated into three different size ranges) or borosilicate glass beads. The best methods for choosing d were those that produced nearly constant collision efficiencies (α's). Characteristic diameters included: d10 (10% of all particles were smaller), d90 (90% of all particles were smaller), d a (arithmetic mean), and d g (geometric mean), where all diameters were calculated using number, area, and volume size distributions. Bacterial α's decreased in proportion to the distance traveled in the packed bed, and were scaled by the number of bacteria-sediment collisions using a dimensionless collision number (ξ). These comparisons indicated that characteristic diameters based on the smaller particles ( d a and d g using number distributions, and d10 using a volume distribution) most accurately described bacterial transport in the different-sized porous media.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 122 • Issue 5 • May 1996
Pages: 407 - 415
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: May 1, 1996
Published in print: May 1996
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