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Researchers have studied the effects of biofilm accumulation
on the terminal settling velocity (Ut) and the expansion coeffi-
cient (n) in fluidized bed reactors [15¨C21].Most of themreported
their results from correlations originally derived for rigid par-
ticles that were modified for biofilm system applications. In a
previous work [22], a sensitivity analysis of correlations pro-
posed by these authors for estimation of parameters Ut and n
was presented. The aim was to show the dispersion of results
using the most quoted correlations. However, they have been
mainly applied to aerobic biofilm systems, and seem to be less
appropriate for anaerobic systems than the original equation of
Richardson and Zaki [23], quite used to calculate n in most
works focused on anaerobic fluidized bed reactors (Eq. (4)),
and the equation provided by Foscolo et al. [24] to calculate Ut
(Eq. (3)). These correlations are valid for the range of Reynolds
number (Ret) investigated, and are here used to calculate Ut and
n:

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wildwolf110

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