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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
Published by: Water Environment Federation
Stable URL: http://www.jstor.org/stable/25043933
Page Count: 6
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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.
Research Journal of the Water Pollution Control Federation © 1990 Water Environment Federation