title: Total cost minimization control scheme for biological wastewater treatment process and its evaluation based on the COST benchmark process.
abstract: This paper proposes a new cost minimisation control scheme for a predenitrification type of biological wastewater treatment process and evaluates the validity of the control scheme based on the benchmark process presented by Copp. The control scheme adopting a hierarchical control structure incorporates lower-level controllers that consist of a set of local dynamic controllers and a higher-level static optimiser that provides the set points of the lower-level controllers based on the total cost index of Vanrolleghem and Gillot. Prior to benchmarking, this paper derives a simplified process model used for the optimiser, which is able to approximate the benchmark process model effectively as well as is simplified sufficiently for faster set point optimisation for on-line purposes. Numerical experiments evaluate the effectiveness of the proposed control scheme from various viewpoints including process operational and optimisation viewpoints.
authors.affiliation: Power and Industrial Systems R and D Center, Toshiba Corporation, 1, Toshiba-Cho, Fuchu-shi, Tokyo 183-8511, Japan. osamu2.yamanaka@toshiba.co.jp
authors.forename: O
authors.initials: O
authors.lastname: Yamanaka
authors.forename: T
authors.initials: T
authors.lastname: Obara
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D019985:Benchmarking; D003363:Cost Control; D014865:Waste Disposal, Fluid / Q000191:economics*