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The optimal dissolved oxygen profile in a nitrifying activated sludge process: comparisons with ammonium feedback control
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
2013 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 68, no 3, 641-649 p.Article in journal (Refereed) Published
Abstract [en]

Ammonium feedback control is increasingly used to determine the dissolved oxygen (DO) set-point in aerated activated sludge processes for nitrogen removal. This study compares proportional-integral (PI) ammonium feedback control with a DO profile created from a mathematical minimisation of the daily air flow rate. All simulated scenarios are set to reach the same treatment level of ammonium, based on a daily average concentration. The influent includes daily variations only and the model has three aerated zones. Comparisons are made at different plant loads and DO concentrations, and the placement of the ammonium sensor is investigated. The results show that ammonium PI control can achieve the best performance if the DO set-point is limited at a maximum value and with little integral action in the controller. Compared with constant DO control the best-performing ammonium controller can achieve 1-3.5% savings in the air flow rate, while the optimal solution can achieve a 3-7% saving. Energy savings are larger when operating at higher DO concentrations.

Place, publisher, year, edition, pages
2013. Vol. 68, no 3, 641-649 p.
Keyword [en]
dissolved oxygen control, optimisation, supervisory ammonium control, wastewater
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:uu:diva-208395DOI: 10.2166/wst.2013.287ISI: 000323768000019OAI: oai:DiVA.org:uu-208395DiVA: diva2:652143
Available from: 2013-09-30 Created: 2013-09-30 Last updated: 2017-12-06Bibliographically approved

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Åmand, LindaCarlsson, Bengt

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