Study of performances, stability and microbial characterization of a Sequencing Batch Biofilter Granular Reactor working at low recirculation flow

► Stable granulation was achieved despite low organic load and shear stress. ► Methane production in an aerated granular reactor was obtained. ► Low sludge production was obtained. ► Optimization of wastewater recirculation flow can reduce process energy demand. ► Presence of filamentous bacteria didn't affect reactor depuration performances.