title: Retrofitting activated sludge systems to intermittent aeration for nitrogen removal.
abstract: The paper provides the basis and the conceptual approach of applying process kinetics and modelling to the design of alternating activated sludge systems for retrofitting existing activated sludge plants to intermittent aeration for nitrogen removal. It shows the significant role of the two specific parameters, namely, the aerated fraction and the cycle time ratio on process performance through model simulations and proposes a way to incorporate them into a design procedure using process stoichiometry and mass balance. It illustrates the effect of these parameters, together with the sludge age, in establishing the balance between the denitrification potential and the available nitrogen created in the anoxic/aerobic sequences of system operation.
authors.affiliation: Mercedes-Benz Türk AS. Quality Management Department, Hoşdere Köyü Mevkii Sirat Deresi Hadimköy-Istanbul, Turkey.
authors.forename: O
authors.initials: O
authors.lastname: Hanhan
authors.forename: N
authors.initials: N
authors.lastname: Artan
authors.forename: D
authors.initials: D
authors.lastname: Orhon
mesh_terms: D019149:Bioreactors; D004867:Equipment Design; D007700:Kinetics; D008962:Models, Theoretical; D009584:Nitrogen / Q000302:isolation & purification*; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods
chemical_list: D012722:Sewage; D009584:Nitrogen