Temperature is an important factor affecting biomass activity, which is critical to maintain efficient biological wastewater treatment, and also physiochemical properties of mixed liquor as dissolved oxygen saturation and settling velocity. Controlling temperature is not normally possible for treatment systems but incorporating factors impacting temperature in the design process, such as aeration system, surface to volume ratio, and tank geometry can reduce the range of temperature extremes and improve the overall process performance. Determining how much these design or up-grade options affect the tank temperature requires a temperature model that can be used with existing design methodologies. This paper presents a new steady state temperature model developed by incorporating the best aspects of previously published models, introducing new functions for selected heat exchange paths and improving the method for predicting the effects of covering aeration tanks. Numerical improvements with embedded reference data provide simpler formulation, faster execution, easier sensitivity analyses, using an ordinary spreadsheet. The paper presents several cases to validate the model.
Research Article|January 01 2009
Temperature modelling and prediction for activated sludge systems
1Department of Civil and Environmental Engineering, University of Florence, Via S. Marta 3, 50139 Firenze, Italy E-mail: firstname.lastname@example.org; email@example.com
3DIIAR-Environmental Departement, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy E-mail: firstname.lastname@example.org
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Water Sci Technol (2009) 59 (1): 125-131.
S. Lippi, D. Rosso, C. Lubello, R. Canziani, M. K. Stenstrom; Temperature modelling and prediction for activated sludge systems. Water Sci Technol 1 January 2009; 59 (1): 125–131. doi: https://doi.org/10.2166/wst.2009.587
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