title: Global predictive real-time control of Quebec Urban Community's westerly sewer network.
abstract: Quebec Urban Community (QUC) has selected Global Predictive Real-Time Control (GP-RTC) as the most efficient approach to achieve environmental objectives defined by the Ministry of Environment. QUC wants to reduce combined sewer overflows (CSOs) frequency to the St Lawrence river to two events per summer period in order to reclaim the use of Jacques-Cartier Beach for recreational activities and sports of primary contact. QUC's control scheme is based on the Certainty Equivalent Control Open Loop Feedback (CEOLF) strategy which permits one to introduce, at each control period, updated measurements and meteorological predictions. A non-linear programming package is used to find the flow set points that minimise a multi-objective (cost) function, subjected to linear equality and inequality constraints representing the physical and operational constraints on the sewer network. Implementation of GP-RTC on QUC's westerly network was performed in the summer of 1999 and was operational by mid-August. Reductions in overflow volumes with GP-RTC compared to static control are attributed to the optimal use of two existing tunnels as retention facilities as well as the maximal use of the wastewater treatment plant (WWTP) capacity.
authors.affiliation: BPR Groupe-conseil, 4655, blvd Wilfrid-Hamel, Quebec, Quebec, G1P 217, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Pleau
authors.forename: G
authors.initials: G
authors.lastname: Pelletier
authors.forename: H
authors.initials: H
authors.lastname: Colas
authors.forename: P
authors.initials: P
authors.lastname: Lavallée
authors.forename: R
authors.initials: R
authors.lastname: Bonin
mesh_terms: D003199:Computer Systems; D005618:Fresh Water; D006801:Humans; D011237:Predictive Value of Tests; D011792:Quebec; D011998:Recreation; D012621:Seasons; D012722:Sewage; D012984:Software; D014504:Urban Health; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage