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The appropriate description of fluid flow pattern in fluidized bed biofilm reactor is necessary for the prediction of its system performance. The experimental correlation equation of the longitudinal dispersion coefficient was estimated by the tracer impulse response method using the various particles which are similar in physical properties to the bioparticles, that is, biofilms coated onto growth supporting carriers. The presented correlation equation between longitudinal dispersion coefficient, void fraction and particle diameter was obtained by introducing well-known Taylor's and Kozeny's models. It is proved that the presented correlation is more valid within the range of particle Reynolds number used in this experiment, compared with the prediction by Krishnaswamy's and Chung's experimental correlations.

CHARACTERISTICS OF LONGITUDINAL DISPERSION OF LIQUID IN FLUIDIZED BED BIOFILM REACTOR