On the modelling and simulation of a bnr activated sludge process based on distributed parameter approach
A computational algorithm, based on an orthogonal collocation approach is developed to simulate a BNR activated sludge process consisting of anaerobic, anoxic and aerobic zones in a back-to-back scheme. The hydraulic model employed in this study considers backmixing or intermixing, which can represe...
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| Published in: | Water science and technology Vol. 39; no. 6; pp. 79 - 88 |
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| Main Authors: | , , |
| Format: | Journal Article Conference Proceeding |
| Language: | English |
| Published: |
Oxford
Pergamon Press
01.01.1999
IWA Publishing |
| Subjects: | |
| ISBN: | 0080436463, 9780080436463 |
| ISSN: | 0273-1223, 1996-9732 |
| Online Access: | Get full text |
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| Abstract | A computational algorithm, based on an orthogonal collocation approach is developed to simulate a BNR activated sludge process consisting of anaerobic, anoxic and aerobic zones in a back-to-back scheme. The hydraulic model employed in this study considers backmixing or intermixing, which can represent the actual process more accurately than the idealised flow schemes commonly employed for modelling and/or design of the activated sludge bioreactor. The kinetic model of the International Association on Water Quality (IAWQ) - Activated Sludge Model No. 2 (ASM No. 2) was reduced to submodels representing the anaerobic, anoxic and aerobic zones. Validation of simulated results against pilot-scale experimental data suggested that the new computational algorithm is able to predict the behaviour of components of interest reasonably well despite uncertainties with processes and parameters related to phosphorus accumulating organisms. Predicted transient properties may be gainfully employed for improvement to the operation and control of the process. |
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| AbstractList | A computational algorithm, based on an orthogonal collocation approach is developed to simulate a BNR activated sludge process consisting of anaerobic, anoxic and aerobic zones in a back-to-back scheme. The hydraulic model employed in this study considers backmixing or intermixing, which can represent the actual process more accurately than the idealised flow schemes commonly employed for modelling and/or design of the activated sludge bioreactor. The kinetic model of the International Association on Water Quality (IAWQ) - Activated Sludge Model No. 2 (ASM No. 2) was reduced to submodels representing the anaerobic, anoxic and aerobic zones. Validation of simulated results against pilot-scale experimental data suggested that the new computational algorithm is able to predict the behaviour of components of interest reasonably well despite uncertainties with processes and parameters related to phosphorus accumulating organisms. Predicted transient properties may be gainfully employed for improvement to the operation and control of the process. Distributed parameter models were formulated of the biological nutrients removal (BNR) activated sludge process based on the axial dispersion theory and reduced-order kinetic models of the International Association on Water Quality (IAWQ) Activated Sludge Model No.2. The global orthogonal collocation technique was used to introduce a new numerical algorithm for the BNR activated sludge process. The algorithm was validated using data from an existing continuous pilot-scale BNR activated sludge plant in Sydney, Australia. The computational algorithm was able to predict the behaviour of the BNR process with reasonable accuracy. |
| Author | WANG, F. Y LEE, T. T NEWELL, R. B |
| Author_xml | – sequence: 1 givenname: T. T surname: LEE fullname: LEE, T. T organization: Computer-Aided Process Engineering Centre, Department of Chemical Engineering, St. Lucia 4072, Brisbane, Australia – sequence: 2 givenname: F. Y surname: WANG fullname: WANG, F. Y organization: Computer-Aided Process Engineering Centre, Department of Chemical Engineering, St. Lucia 4072, Brisbane, Australia – sequence: 3 givenname: R. B surname: NEWELL fullname: NEWELL, R. B organization: Advanced Wastewater Management Centre, The University of Queensland, St. Lucia 4072, Brisbane, Australia |
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| DOI | 10.1016/S0273-1223(99)00125-0 |
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| Keywords | Activated sludge Elimination Nutrient Numerical simulation Waste water purification Modeling Distributed parameter system Biological purification |
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| Snippet | A computational algorithm, based on an orthogonal collocation approach is developed to simulate a BNR activated sludge process consisting of anaerobic, anoxic... Distributed parameter models were formulated of the biological nutrients removal (BNR) activated sludge process based on the axial dispersion theory and... |
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| SubjectTerms | Activated sludge Activated sludge process Algorithms Anaerobic processes Anoxia Applied sciences Back mixing Bioaccumulation Biological and medical sciences Biological treatment of waters Bioreactors Biotechnology Collocation methods Computation Computer applications Computer simulation Environment and pollution Exact sciences and technology Fundamental and applied biological sciences. Psychology General purification processes Hydraulic models Industrial applications and implications. Economical aspects Mathematical models Modelling Parameter uncertainty Phosphorus Pollution Process parameters Sludge Wastewaters Water quality Water treatment and pollution Water treatment plants |
| Title | On the modelling and simulation of a bnr activated sludge process based on distributed parameter approach |
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