The Moving-Bed Biofilm Reactor (MBBR) is a moving bed
plant, leading to the activated sludge biological
clearing. These plants, defined biomass reactors, are
different from suspended traditional systems: in fact
the activated sludge within the reaction,
oxidation/nitrification section, is not suspended in
the water to be treated, but adheres to a series of
plastic material carriers, exhibiting a high specific
surface protection, when suspended and mobile inside
the bioreactor. Such carriers are in plastics, whose
density is similar to the water density, and they are
suspended through the air inflow from the vessel
bottom through lowers.
There are two MBBR systems: