Control of Nitrogen Removal
in Activated Sludge Processes
By Par Samuelsson
Uppsala Dissertations from the Faculty of Science and Technology, No. 64
Uppsala University Press
160 pages, Illustrated, 6 ½ x 9 ½”
$45.00 Paper Original
This is a Ph.D. dissertation. More stringent requirements on nitrogen removal from wastewater are the motivation for this thesis. In order to improve treatment results and enhance cost-efficient operation of wastewater treatment plants, model based control strategies are presented. A Java based simulator for activated sludge processes (JASS) is presented.
The graphical user interface, educational experiences and implemented control strategies are discussed. Controlling the addition of an external carbon source is the next topic discussed. A simple model based feedforward controller is derived and evaluated in a simulation study. The controller attenuates process disturbances quickly.
Further, two feedforward controllers for adjusting the aeration volume in activated sludge processes are derived. The aim of the volume control strategies was to efficiently dampen the impact of process disturbances without using an excessively high dissolved oxygen concentration. The simulation results are promising and show that the aeration volume may be a feasible control variable.
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