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Titre :
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Bacterial deposition in porous media related to the clean bed collision efficiency and to substratum blocking by attached cells
|
|
Auteurs :
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H. Rijnaarts ;
W. Norde ;
E. Bouwer ;
AL Et
|
|
Type de document :
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article/chapitre/communication
|
|
Année de publication :
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1996
|
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Format :
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p. 2877-2883
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Langues:
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= Anglais
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Catégories :
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Biologie
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Mots-clés:
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MILIEU POREUX
;
BACTERIE
;
ADSORPTION
;
SOL
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Résumé :
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Deposition of seven bacterial strains on spherical glass and Teflon collectors was studied in vertical downflow columns at an ionic strength (l) of 0.1 M. The various bacteria had either one of the following types of major cell-surface constituents: nonpolysaccharide (NP), amphiphilic (AMPH), or anionic polysaccharide (AP) macromolecules. Deposition was analyzed in terms of the clean bed collision efficiency alpha(0) (the probability of a cell to attach upon reaching a substratum free of cells) and a blocking factor B (the ratio of the area blocked by an attached cell to the geometric area of a cell). The value of cio decreased from 1.0 to about 0.01 in the following order of cell-surface constituents/collector combinations: NP/Teflon and AMPH/Teflon > NP/glass > AMPH/glass, AP/Teflon, and AP/glass. The value for B, at a Peclet number of 1 x 10(5), increased from about 3 to 18 in the order NP/low cell charge
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Source :
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Environmental science and technology, vol.30, n°10
|
