Improved computational model (AQUIFAS) for activated sludge, integrated fixed-film activated sludge, and moving-bed biofilm reactor systems, part III: analysis and verification

Water Environment Research : a Research Publication of the Water Environment Federation
Dipankar Sen, C W Randall

Abstract

Research was undertaken to analyze and verify a model that can be applied to activated sludge, integrated fixed-film activated sludge (IFAS), and moving-bed biofilm reactor (MBBR) systems. The model embeds a biofilm model into a multicell activated sludge model. The advantage of such a model is that it eliminates the need to run separate computations for a plant being retrofitted from activated sludge to IFAS or MBBR. The biofilm flux rates for organics, nutrients, and biomass can be computed by two methods-a semi-empirical model of the biofilm that is relatively simpler, or a diffusional model of the biofilm that is computationally intensive. Biofilm support media can be incorporated to the anoxic and aerobic cells, but not the anaerobic cells. The model can be run for steady-state and dynamic simulations. The model was able to predict the changes in nitrification and denitrification at both pilot- and full-scale facilities. The semi-empirical and diffusional models of the biofilm were both used to evaluate the biofilm flux rates for media at different locations. The biofilm diffusional model was used to compute the biofilm thickness and growth, substrate concentrations, volatile suspended solids (VSS) concentration, and fract...Continue Reading

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Aug 20, 2008·Water Environment Research : a Research Publication of the Water Environment Federation·Dipankar Sen, Clifford W Randall

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Aug 20, 2008·Water Environment Research : a Research Publication of the Water Environment Federation·Dipankar Sen, Clifford W Randall
Jul 16, 2009·Water Environment Research : a Research Publication of the Water Environment Federation·Joshua P BoltzJulian Sandino

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