Membrane-aerated biofilm reactors (MABRs) are advantageous for wastewater treatment because of their ability to achieve both nitrification and denitrification in a single bioreactor. The stratification of membrane aerated biofilms, however, needs to be better understood so that MABRs can be properly designed and implemented. In this study, we present a modified multi-population model that accounts for variation in effective diffusivity in biofilms of variable biomass density. For biofilms grown at a low fluid velocity (2 cm s−1), the variation in effective diffusivity had a profound effect on the predicted stratification and activity of bacterial populations. For biofilms grown at a high fluid velocity (14 cm s−1), biomass density was relatively constant as a function of depth and thus there was less substantial variation in effective diffusivity; our modified model, therefore, predicted a population stratification that was similar to its original version under these conditions.
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Research Article|
October 01 2005
Acetate and ammonium diffusivity in membrane-aerated biofilms: improving model predictions using experimental results
J.W. Shanahan;
1Department of Civil Engineering, University of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455, USA, (E-mail: [email protected]; [email protected]; [email protected])
E-mail: [email protected]
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A.C. Cole;
A.C. Cole
1Department of Civil Engineering, University of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455, USA, (E-mail: [email protected]; [email protected]; [email protected])
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M.J. Semmens;
M.J. Semmens
1Department of Civil Engineering, University of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455, USA, (E-mail: [email protected]; [email protected]; [email protected])
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T.M. LaPara
T.M. LaPara
1Department of Civil Engineering, University of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455, USA, (E-mail: [email protected]; [email protected]; [email protected])
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Water Sci Technol (2005) 52 (7): 121–126.
Citation
J.W. Shanahan, A.C. Cole, M.J. Semmens, T.M. LaPara; Acetate and ammonium diffusivity in membrane-aerated biofilms: improving model predictions using experimental results. Water Sci Technol 1 October 2005; 52 (7): 121–126. doi: https://doi.org/10.2166/wst.2005.0190
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