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Updated: Jun 7, 2026

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge
Published on: September 26, 2016
Effect of granule size on autotrophic nitrogen removal in a granular sludge reactor
E I P Volcke1, C Picioreanu, B De Baets
1Department of Biosystems Engineering, Ghent University, Coupure links 653, 9000 Gent, Belgium. eveline.volcke@ugent.be
Abstract:
Autotrophic nitrogen removal through sequential partial nitritation and anammox reactions can be achieved in biofilm reactors by controlling the oxygen concentration in the bulk liquid in such a way that nitrite oxidizers are outcompeted by anammox bacteria. In the case of granular sludge reactors, the granule size may influence the optimal range of oxygen concentration, as has been confirmed in the present study by means of numerical simulations. The range of oxygen concentrations for which combined partial nitritation and anammox conversion is established becomes broader for larger particles and with increasing influent ammonium concentrations. At the same time the likelihood of nitrite accumulation in the reactor effluent also increases.
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