Characterization and modelling of primary settlers have been neglected pretty much to date. However, whole plant and resource recovery modelling requires primary settler model development, as current models lack detail in describing the dynamics and the diversity of the removal process for different particulate fractions. This paper focuses on the improved modelling and experimental characterization of primary settlers. First, a new modelling concept based on particle settling velocity distribution is proposed which is then applied for the development of an improved primary settler model as well as for its characterization under addition of chemicals (chemically enhanced primary treatment, CEPT). This model is compared to two existing simple primary settler models (Otterpohl and Freund; Lessard and Beck), showing to be better than the first one and statistically comparable to the second one, but with easier calibration thanks to the ease with which wastewater characteristics can be translated into model parameters. Second, the changes in the activated sludge model (ASM)-based chemical oxygen demand fractionation between inlet and outlet induced by primary settling is investigated, showing that typical wastewater fractions are modified by primary treatment. As they clearly impact the downstream processes, both model improvements demonstrate the need for more detailed primary settler models in view of whole plant modelling.
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Research Article|
August 27 2015
Modelling and characterization of primary settlers in view of whole plant and resource recovery modelling
Giulia Bachis;
Giulia Bachis
1Département de génie civil et de génie des eaux, Université Laval, 1065 av. de la Médecine, Québec, QC, Canada G1 V 0A6
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Thibaud Maruéjouls;
Thibaud Maruéjouls
1Département de génie civil et de génie des eaux, Université Laval, 1065 av. de la Médecine, Québec, QC, Canada G1 V 0A6
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Sovanna Tik;
Sovanna Tik
1Département de génie civil et de génie des eaux, Université Laval, 1065 av. de la Médecine, Québec, QC, Canada G1 V 0A6
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Youri Amerlinck;
Youri Amerlinck
2Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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Henryk Melcer;
Henryk Melcer
3Brown and Caldwell, 999 Third Avenue, Suite 500, Seattle, WA 98104, USA
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Ingmar Nopens;
Ingmar Nopens
2Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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Paul Lessard;
Paul Lessard
1Département de génie civil et de génie des eaux, Université Laval, 1065 av. de la Médecine, Québec, QC, Canada G1 V 0A6
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Peter A. Vanrolleghem
1Département de génie civil et de génie des eaux, Université Laval, 1065 av. de la Médecine, Québec, QC, Canada G1 V 0A6
E-mail: peter.vanrolleghem@gci.ulaval.ca
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Water Sci Technol (2015) 72 (12): 2251–2261.
Article history
Received:
February 10 2015
Accepted:
August 19 2015
Citation
Giulia Bachis, Thibaud Maruéjouls, Sovanna Tik, Youri Amerlinck, Henryk Melcer, Ingmar Nopens, Paul Lessard, Peter A. Vanrolleghem; Modelling and characterization of primary settlers in view of whole plant and resource recovery modelling. Water Sci Technol 16 December 2015; 72 (12): 2251–2261. doi: https://doi.org/10.2166/wst.2015.455
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