title: Influence of geometrical and operational parameters on the axial dispersion in an aerated channel reactor.
abstract: Residence time distribution experiments have been performed on an activated sludge 3000 m3 channel reactor aerated by gas diffusion (for different liquid flowrates under constant aeration rate and constant water depth) and on a bench-scale channel reactor aerated from the bottom (for different liquid and gas flowrates and water depths) in order to characterize their hydrodynamics. Both units can be modeled as plug flow reactors with axial dispersion. A general correlation has been obtained to predict the axial dispersion coefficient as a function of the gas and liquid velocities and the geometrical parameters of the full-scale and bench-scale reactors. Finally, to facilitate the simulation of biological reactions in transient state, an equivalent model based on tanks-in-series with variable back-mixing flowrate is proposed.
authors.affiliation: Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC-INPL, 1, rue Grandville BP 20451, 54001 Nancy, France. Olivier.Potier@ensic.inpl-nancy.fr
authors.forename: Olivier
authors.initials: O
authors.lastname: Potier
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Leclerc
authors.forename: Marie-Noëlle
authors.initials: MN
authors.lastname: Pons
mesh_terms: D019149:Bioreactors; D004867:Equipment Design; D007700:Kinetics; D008962:Models, Theoretical; D012722:Sewage; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods
chemical_list: D012722:Sewage; D014867:Water