Bed expansion characteristics of liquid fluidized particles with attached microbial growth

The bed expansion behavior of liquid fluidized beds of char particles coated with attached microbial growth of denitrifying mixed bacteria was studied experimentally to obtain an expression that relates the bed expansion to the liquid velocity for liquid fluidized beds of composite particles. As for liquid beds of homogeneous spheres, the bed voidage and the liquid velocity vz for liquid fluidized beds of biomass‐coated particles were found to be related as vz/Vi = ∈n. The correlations recommended by Richardson and Zaki for homogeneous spheres are found to be satisfactory for the estimation of the constant n, but only under certain conditions for the constant Vi.