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Terminal Settling Characteristics of Bioparticles

Kyoung Sin Ro and J. B. Neethling
Research Journal of the Water Pollution Control Federation
Vol. 62, No. 7 (Nov. - Dec., 1990), pp. 901-906
Stable URL: http://www.jstor.org/stable/25043933
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Terminal Settling Characteristics of Bioparticles
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Abstract

The drag forces on biocoated particles, commonly encountered in biological fluidized beds, are greatly augmented due to increased skin drag, caused by the rough surface, and form drag, caused by the nonspherical shape of the particle. Settling velocities of biocoated particles are approximately 55-60% of an equivalent smooth, spherical particle. For nonspherical particles, the drag increases slightly more, decreasing the settling velocity another 5%. Drag coefficient correlations for biological particles should be determined for specific applications due to the observed differences in the composition of the biofilm and its impact on the particle's drag coefficient.

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