scholarly journals Nonlinear PI control for dissolved oxygen tracking at wastewater treatment plant

2008 ◽  
Vol 41 (2) ◽  
pp. 13587-13592 ◽  
Author(s):  
Y. Han ◽  
M.A. Brdys ◽  
R. Piotrowski
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Pi Control

Adaptive predictive expert control of dissolved oxygen concentration in a wastewater treatment plant

2011 ◽  
Vol 64 (5) ◽  
pp. 1130-1136 ◽  
Author(s):  
G. Kandare ◽  
A. Nevado Reviriego
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Operating Conditions ◽  
Expert Control ◽  
Control Loops ◽  
Process Dynamics ◽  
The Common ◽  
Do Control

In this paper we present the application of adaptive predictive expert controllers to dissolved oxygen (DO) control in the aerobic reactors of a wastewater treatment plant. The control system described in this paper consists of adaptive predictive expert control loops complemented by optimisation logic. The controllers successfully cope with nonlinearity and changing operating conditions of the process by predicting the evolution of the controlled variable and adapting to changes in the process dynamics. This results in more precise and stable DO control, offering many benefits. The complementary optimisation logic maintains the air pressure in the common collector at the lowest possible level, enabling adequate DO control and thus considerably reducing energy consumption.

Enhancing biological nitrogen removal in a small wastewater treatment plant by regulating the air supply

2004 ◽  
Vol 48 (11-12) ◽  
pp. 445-452 ◽  
Author(s):  
M. Fiter ◽  
J. Colprim ◽  
M. Poch ◽  
I. Rodríguez-Roda
Keyword(s):  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Low Cost ◽  
Treatment Plant ◽  
Biological Nitrogen Removal ◽  
Air Supply ◽  
Safety Margins ◽  
Biological Nitrogen

Most of the small wastewater treatment plants in Catalonia were not designed to remove nutrients. However, the large safety margins built into their original engineering design has meant that, in many cases, it has been possible to remove part of the nitrogen without being controlled. This paper focuses on the practical experience carried out in one of these facilities, the Bisbal wastewater treatment plant, aimed at enhancing the biological nitrogen removal using simple, low-cost, easy-to-operate measurement and control. The control strategy, which is based on air supply regulation, was previously designed using simulation studies. A dissolved oxygen monitoring system was installed into the facility, while nitrogen concentrations were analysed every day. Optimal dissolved oxygen profiles in the oxidation ditch were identified, while the air supply strategy was modified according to the variations in the influent.

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