Performances of a granular sequencing batch reactor (GSBR).

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Aerobic granulation in sequencing batch reactors is widely reported in literature and in particularin SBAR (Sequencing batch airlift reactor) configuration, due to the high localised hydrodynamic shearforces that occur in this type of configuration. The aim of this work was to observe the phenomenon of theaerobic granulation and to confirm the excellent removal efficiencies that can be achieved with thistechnology. In order to do that, a laboratory-scale plant, inoculated with activated sludge collected from aconventional WWTP, was operated for 64 days: 42 days as a SBAR and 22 days as a SBBC (sequencingbatch bubble column). The performances of the pilot plant showed excellent organics removal. COD andBOD removal efficiencies were respectively, 93 and 94%; on the contrary, N-removal efficiency wasextremely low (5%–45%). The granules dimensions increased during the whole experimentation; change ofreactor configuration contributed to further improve this aspect. The experimental work confirmed theessential role of hydraulic settling time in the formation of aerobic granules and in the sludge settleability andthe need to find an optimum between granule size and oxygen supply to achieve good N-removal efficiency.Keywords Aerobic granular sludge; biomass density; GSBR; SBAR; SBBC; settleability
Original languageEnglish
Pages (from-to)125-133
Number of pages9
JournalWater Science and Technology
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology

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