Keywords: aerobic granulation, periodic submerged biofilters, filling material features, shear forces, biomass density, granular biomass production, sequencing submerged biofilter reactors, SSBR, biofilm particles, excess sludge, wastewater treatment
The essential role of filling material in aerobic granular biomass generation in a periodic submerged biofilter
The paper reports the results of a laboratory-scale investigation aimed at evaluating the influence of the filling material of a Sequencing Submerged Biofilter Reactor (SSBR) on granular biomass generation. The results showed that aerobic granular biomass generation was obtained only in the reactor filled with kmt-k1 carrier, since the features of this filling media are such that they generate a bed characterised by rather uniform internal and external small-sized pore volumes able to retain the released biofilm particles. Finally, the aerobic granule formation improved the biomass retention efficiency and reduced the excess sludge production.