Acetate and ammonium diffusivity in membrane-aerated biofilms: Improving model predictions using experimental results

J. W. Shanahan, A. C. Cole, M. J. Semmens, Timothy M LaPara

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)121-126
Number of pages6
JournalWater Science and Technology
Volume52
Issue number7
StatePublished - Dec 7 2005

Keywords

  • Diffusion
  • Membrane aerated biofilm reactors
  • Modeling

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