title: Reduced modeling and state observation of an activated sludge process.
abstract: This article first proposes a reduction strategy of the activated sludge process model with alternated aeration. Initiated with the standard activated sludge model (ASM1), the reduction is based on some biochemical considerations followed by linear approximations of nonlinear terms. Two submodels are then obtained, one for the aerobic phase and one for the anoxic phase, using four state variables related to the organic substrate concentration, the ammonium and nitrate-nitrite nitrogen, and the oxygen concentration. Then, a two-step robust estimation strategy is used to estimate both the unmeasured state variables and the unknown inflow ammonium nitrogen concentration. Parameter uncertainty is considered in the dynamics and input matrices of the system.
authors.affiliation: LAAS-CNRS, Université de Toulouse, 31077 Toulouse Cedex 4, France. isabelle.queinnec@laas.fr
authors.forename: Isabelle
authors.initials: I
authors.lastname: Queinnec
authors.forename: Claudia-Sophya
authors.initials: CS
authors.lastname: Gómez-Quintero
mesh_terms: D001419:Bacteria / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D001673:Biodegradation, Environmental; D018533:Biomass; D007700:Kinetics; D008954:Models, Biological; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology
chemical_list: D012722:Sewage