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Usually refer to sewage treatment Removal of containments from wastewater Activated sludge process Aerobic/anaerobic Introduction
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PERIODIC CONTROL OF A WASTEWATER TREATMENT PROCESS
TO IMPROVE PRODUCTIVITY MUHAMMAD RIZWAN AZHAR
KING SAUD UNIVERSITYSaudi Arabia
Introduction Process description Periodic control RobustnessConclusion
Outline
Usually refer to sewage treatmentRemoval of containments from wastewaterActivated sludge processAerobic/anaerobic
Introduction
Process Description
ReactorV, S, X SettlerD, S i X , S S
WDUD, X r , S
Well mixed unitsWell aerated reactorXi = 0No reaction in settlerNo settler dynamicsIdeal settler: Xout = 0
Process modelAssumptions
Optimal Operating Conditions
Variation of Steady State with Dilution rate; dotted: Biomass (X), dashed: Substrate (S), solid: Productivity (Pr)
Application Concept of MPC
PlantMPC
Model+
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ym
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x
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Control Objective
Controlled Variables:ProductivityPr=D(1-S) i.e. amount of waste water treated
Manipulated Variables:Dilution rate D
Periodic forcing the input DRobustness in presence of
Modeling error External disturbance rejection
Control objective
Enhanced productivity in terms of substrate consumption
10 % increase than the maximum productivity in case steady state
Controller performance
Variable feed quality in WWTP Closed loop response for -25% error in Y, 10% error µ and
-10% step change in K
Robustness (Tracking modeling errors)
Regulatory performance 10 % increase in substrate concentration
Robustness (External disturbance)
10 % increase beyond the maximum productivity when periodic operation is enforced via MPC
Robust controller in presence of modeling errors and external disturbances
Less energy consumption as the fluctuation rate is kept within xx% (need to ad some numbers here)
Economically feasible (you should explain how in words)
Conclusion
Questions
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