Research Article
U-Model-Based Active Disturbance Rejection Control for the Dissolved Oxygen in a Wastewater Treatment Process
Table 1
List of variables in BSM1.
| Q0 | Inlet flow rate | Z0 | Influent constituent concentration | Qa | Internal flow recirculation rate | Za | Internal flow constituent concentration | Qr | Return sludge flow rate | Zr | Return sludge constituent concentration | Qf | Flow rate to the secondary clarifier | Zf | Constituent concentration of the wastewater to the secondary clarifier | Qu | Underflow rate of the secondary clarifier | Zu | Constituent concentration of the underflow rate of the secondary clarifier | | Wastage flow rate | | Wastage constituent concentration | Qe | Effluent flow rate | Ze | Effluent constituent concentration | SO,i | Oxygen concentration at compartment i | KLa,i | Oxygen transfer coefficient at compartment i | AE | Aeration energy | PE | Pumping energy | SP | Sludge production to be disposed | ME | Mixing energy | EC | Consumption of external carbon source | TSS | Suspended solid concentration | Vi | Volume of the tank i | XS,i | Slowly biodegradable substrate concentration at tank i | XI,i | Particulate inert organic matter concentration at tank i | XB,H,i | Active heterotrophic biomass concentration at tank i | XB,A,i | Active autotrophic biomass concentration at tank i | XP,i | Particulate products arising from biomass decay concemtration at tank i | r 5 | Appropriate conversion rate |
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