Nonlinear and set-point control of the dissolved oxygen concentration in an activated sludge process

1996 ◽  
Vol 34 (3-4) ◽  
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Oxygen Concentration ◽  
Activated Sludge Process ◽  
Dissolved Oxygen Concentration ◽  
Set Point ◽  
Point Control ◽  
Set Point Control

Nonlinear and set-point control of the dissolved oxygen concentration in an activated sludge process

1996 ◽  
Vol 34 (3-4) ◽  
pp. 135-142 ◽  
Author(s):  
Carl-Fredrik Lindberg ◽  
Bengt Carlsson
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Oxygen Concentration ◽  
Controller Design ◽  
Ammonia Concentration ◽  
Pilot Scale ◽  
Process Efficiency ◽  
Activated Sludge Process ◽  
Dissolved Oxygen Concentration ◽  
Set Point

Control of the dissolved oxygen concentration (DO) in an activated sludge process is of considerable importance because of economy and process efficiency. A strategy for designing a nonlinear DO controller was developed. The basic idea was to take the nonlinear oxygen transfer function into account in the controller design. Simulations illustrated that a nonlinear DO controller outperforms a standard PI controller. This was also confirmed in a pilot-scale plant experiment. A supervision (set-point) controller for the DO is also outlined. Initial simulations showed promising results where the aeration system is used more efficiently and the effluent ammonia concentration could be maintained low.

Improving oxygen concentration control in activated sludge process with estimation of respiration and scheduling control

2006 ◽  
Vol 53 (4-5) ◽  
pp. 283-291 ◽  
Author(s):  
S. Gerkšič ◽  
D. Vrečko ◽  
N. Hvala
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Oxygen Concentration ◽  
Pi Controller ◽  
Activated Sludge Process ◽  
Dissolved Oxygen Concentration ◽  
Integral Control ◽  
Process Dynamics ◽  
On Line ◽  
The Cost

The paper presents an efficient and simple model-based method of on-line estimation of respiration from the current values of dissolved oxygen concentration and airflow signals. Fast estimation of respiration is important because respiration appears as the most important disturbance signal in the control of dissolved oxygen concentration, and could therefore be used for improving control efficiency. A parameter scheduling PI (proportional and integral) control scheme is proposed, where the estimated respiration signal is used for scheduling of the PI controller parameters, by using local linearization of the process dynamics. The performance of the scheduling controller is compared to a conventional PI controller in simulation using the COST simulation benchmark, and experimentally on an activated sludge process pilot plant.

scholarly journals Effects of dissolved oxygen concentration on activated sludge organisms

1980 ◽  
Vol 16 (1-2) ◽  
pp. 1-10
Author(s):  
Takashi HANDA ◽  
Noboru FURUYA ◽  
Eiji FUJIMOTO ◽  
Yuhei INAMORI
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Oxygen Concentration ◽  
Dissolved Oxygen Concentration
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