Water Science & Technology · 1989 · 10 citations · 0 references
EngineeringEnvironmental EngineeringEnvironmental SciencesEnvironmental ModelingWastewater TreatmentWater TreatmentActivated Sludge ProcessDissolved Oxygen ControlSludge HandlingSludge ManagementSludge TreatmentWaste TreatmentActivated Sludge Oxygen ControlDissolved OxygenDissolved Oxygen Control SystemsOxygen Transfer ModelingOxygen Transfer RateOxygen Uptake RateOxygen Uptake Rate EstimationOxygen Utilization Rate
The Holmberg/Olsson method for simultaneous adaptive dissolved oxygen control and oxygen utilisation rate estimation in the diffused air activated sludge process is evaluated (Holmberg and Olsson. 1985; Holmberg, 1986). Small offsets in the parameter estimates occur because the Q/V term is not included in the estimator model. Significant offsets may occur as a result of assumptions regarding the KLa/air flow rate relationship. Extensions are proposed to overcome the offset problems.