Towards advanced aeration modelling: from blower to bubbles to bulk
Vers une modélisation avancée de l'aération : du surpresseur aux bulles à la liqueur mixte
Amaral, A. ; Schraa, O. ; Reiger, L. ; Fayolle, Y. ; Gillot, S. ; Bellandi, G. ; Amerlinck, Y. ; Mortier, S.T.F.C. ; Gori, R. ; Neves, R. ; Nopens, I.
Type de document
Article de revue scientifique à comité de lecture
Affiliation de l'auteur
BIOMATH GHENT UNIVERSITY BEL ; INCTRL SOLUTIONS INC OAAKVILLE CAN ; INCTRL SOLUTIONS INC OAAKVILLE CAN ; IRSTEA ANTONY UR HBAN FRA ; IRSTEA LYON UR MALY FRA ; BIOMATH GHENT UNIVERSITY BEL ; BIOMATH GHENT UNIVERSITY BEL ; BIOMATH GHENT UNIVERSITY BEL ; UNIVERSITY OF FLORENCE ITA ; MARETEC LISBOA PRT ; BIOMATH GHENT UNIVERSITY BEL
Résumé / Abstract
Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most Water Resource Recovery Facilities. Most modelling studies neglect the inherent complexity of the aeration systems used. Typically, the blowers, air piping, and diffusers are not modelled in detail, completely-mixed reactors in series are used to represent plug-flow reactors, and empirical correlations are used to describe the impact of operating conditions on bubble formation and transport, and oxygen transfer from the bubbles to the bulk liquid. However, the mechanisms involved are very complex in nature and require significant research efforts. This contribution highlights why and where there is a need for more detail in the different aspects of the aeration system and compiles recent efforts to develop physical models of the entire aeration system (blower, valves, air piping and diffusers), as well as adding rigour to the oxygen transfer efficiency modelling (impact of viscosity, bubble size distribution, shear and hydrodynamics). As a result of these model extensions, more realistic predictions of dissolved oxygen profiles and energy consumption have been achieved. Finally, the current needs for further model development are highlighted.
Water Science and Technology, vol. 75, num. 3, p. 507 - 517