Computer Program Development for the Design of Integrated Fixed Film Activated Sludge Wastewater Treatment Processes
Publication: Journal of Environmental Engineering
Volume 131, Issue 11
Abstract
The Integrated Fixed Film Activated Sludge (IFAS) wastewater treatment systems are activated sludge biological nutrient removal processes that have been enhanced by the addition of biofilm support media into the aerobic zone of the system to obtain year round nitrification in activated sludge systems that otherwise could not support it. The objective of this study was to develop a computer package called “IFAS” that allows steady-state simulation of IFAS wastewater treatment processes based on the International Association Water Quality general model for activated sludge and empirical equations for chemical oxygen demand (COD) uptake and nitrification on integrated fixed film developed at Virginia Tech. The current version of the IFAS program supports only sponge-type media; however, the model could be modified for other media if the appropriate equations and required parameters values are known. Data obtained from IFAS sponge media pilot scale plants treating a weak municipal wastewater supplemented by sodium acetate, urea, sodium bicarbonate, and potassium phosphates and operated at different aerobic mean cells residence times were used to evaluate the model with parameter values for nitrification and COD uptake rates developed in batch studies. The model-generated ammonia and soluble COD profiles were insignificantly different statistically from the experimental data. The IFAS model satisfactorily predicts carbonaceous removal and nitrification, and has the potential to be a useful tool for scientists and engineers seeking to design and optimize either IFAS or conventional biological nutrient removal activated sludge systems.
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References
Barker, P. S., and Dold, P. L. (1997). “General model for biological nutrient removal activated sludge systems: Model presentation.” Water Environ. Res.., 69(5), 969–984.
Henze, M., Grady, C. P. L., Gujer, W., Marais, G. v. R., and Matsuo, T. (1987). “Activated sludge model No. 1.” Science Technical Rep. No. 1, International Association of Water Pollution Research and Control, London.
Jensen, K. R. (1995). “Effects of integrated fixed film activated sludge on nitrogen removal in biological nutrient removal systems.” MS thesis, Virginia Tech, Blacksburg, Va.
Liu, H. (1996). “Utilization of captor sponges to maintain nitrification and denitrification in BNR activated sludge at low aerobic MCRTs.” MS thesis, Virginia Tech, Blacksburg, Va.
Mitta, P. R. (1994). “Utilization of fixed film media in BNR activated sludge systems.” MS thesis, Virginia Tech, Blacksburg, Va.
Randall, C. W., and Sen, D. (1996). “Full-scale evaluation of an integrated fixed-film activated sludge (IFAS) process for enhanced nitrogen removal.” Water Sci. Technol. 33(12), 155–162.
Sen, D., Farren, G. D., Copithorn, R. R., and Randall, C. W. (1993). “Full scale evaluation of nitrification and denitrification on fixed film media (Ringlace) for design of a single sludge system.” Proc., 66th Annual Conf. of the Water Environment Federation, Vol. 3, Water Environment Federation, Washington, D.C., 137–148.
Sen, D. (1995). “COD removal, nitrification, and denitrification kinetics and mathematical modeling of an integrated fixed film activated sludge (IFAS) system.” PhD thesis, Dept. of Civil and EnvironmentalEngineering, Virginia Tech, Blacksburg, Va.
Sen, D., and Randall, C. W. (1996). “Mathematical model for a Multi-CSTR integrated fixed film activated sludge (IFAS) system.” Proc., 69th Annual Conf. of the Water Environment Federation, Vol I, Water Environment Federation, Washington, D.C., 805–816.
Sen, D., Randall, C. W., and Liu, H. (1995). “Effect of suspended solids MCRT on COD and nitrogen removal kinetics of biofilm support media integrated in activated sludge systems.” Proc., 68th Annual Conf. and Exposition of the Water Environment Federation, Session No. 34, Miami, Fla., Water Environment Federation, Washington, D.C.
Wentzel, M. C., Dold, P. L., Ekama, G. A., and Marais, G. v. R. (1989). “Enhanced polyphosphate organism cultures in activated sludge systems. III.” Kinetic Model. Water SA, 15, 89.
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© 2005 ASCE.
History
Received: Jan 14, 2004
Accepted: Feb 8, 2005
Published online: Nov 1, 2005
Published in print: Nov 2005
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