Fluidization and reactor biomass characteristics of the denitrification fluidized bed biofilm reactor

Abstract

The fluidization and reactor biomass characteristics of the denitrification fluidized bed biofilm reactor (FBBR) were investigated. Experimental evidence obtained indicates that Richardson-Zaki correlation, which was developed for rigid solid particles, provides an excellent description of the fluidization mechanics of a denitrification FBBR. However, correlations for calculation of drag coefficient and expansion index should be modified to account for the FBBR characteristics that the degree of bed expansion increases with increased bioparticle size (i.e. increased biofilm thickness). The fluidization and reactor biomass correlations developed in this investigation are capable of providing a direct and accurate prediction of biomass concentration and bed expansion in FBBRs designed for wastewater treatment applications. Engineering applications of these correlations are discussed.