Some fluidization characteristics of biological beds.
The free-fall terminal velocity of particles coated with a nitrifying biofilm was investigated. The drag force exerted by the liquid on a biocoated particle was found larger than that for an uncoated particle. A new formula for the drag coefficient was proposed. The wet density of biofilm was estimated as 1.14 g/cm(3). A proposed modification of the Zaki-Richardson method was successfully used for calculations of the porosity of a fluidized bed.
Department of Civil Engineering, University of Toronto, Toronto, Ontario M5S 1A4, Canada.
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Hermanowicz
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Ganczarczyk