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Main Title Cell Density and Non-Equilibrium Sorption Effects on Bacterial Dispersal in Groundwater Microcosms.
Author Lindqvist, R. ; Enfield, C. G. ;
CORP Author Rice Univ., Houston, TX. Dept. of Environmental Science and Engineering. ;Lund Univ. (Sweden).;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1992
Year Published 1992
Report Number EPA-R-812808; EPA/600/J-92/451;
Stock Number PB93-141505
Additional Subjects Aquatic microbiology ; Ground water ; Aquatic ecosystems ; Bacteria ; Soils ; Sands ; Bacillus ; Pseudomonas ; Enterobacter ; Microbial colony count ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB93-141505 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 20p
The relative importance of dispersion, physical straining, nonequilibrium sorption, and cell density on the dispersal of bacteria was examined in saturated, flow-dynamic sand columns. The bacterial breakthrough as a result of different size distributions of sand particles was followed by measuring the effluent concentration of (3)H-adenosine-labelled cells of a Bacillus sp. and an Enterobacter sp. strain suspended in ground-water. The breakthrough curves were compared with theoretical curves predicted from an advective-dispersive equilibrium sorption model (ADS), an ADS model with a first order sink term for irreversible cell reactions, a two-site model (equilibrium and nonequilibrium sorption sites), and a filtration model. Bacterial sand:water isotherms were linear in the experimental concentration range but had positive intercepts. The partition coefficients ranged from 15 to 0.4 for the Bacillus sp., and 120 to 0.4 for a Pseudomonas sp., and decreased with increasing particle size of the dominant fraction. In a kinetic study, the partition coefficient for the Enterobacter sp. in the smaller particle sand was 63 after one hour, but had decreased to 9 after 19 hours. (Copyright (c) Springer-Verlag New York Inc. 1992.)