Measuring and modeling the oxygen profile in a nitrifying Moving Bed Biofilm Reactor

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Measuring and modeling the oxygen profile in a nitrifying Moving Bed Biofilm Reactor

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Publication Article, peer reviewed scientific
Title Measuring and modeling the oxygen profile in a nitrifying Moving Bed Biofilm Reactor
Author(s) Masic, Alma ; Bengtsson, Jessica ; Christensson, Magnus
Date 2010
English abstract
In this paper we determine the oxygen profile in a biofilm on suspended carriers in two ways: firstly by microelectrode measurements and secondly by a simple mathematical model. The Moving Bed Biofilm Reactor is well-established for wastewater treatment where bacteria grow as a biofilm on the protective surfaces of suspended carriers. The flat shaped BiofilmChip P was developed to allow good conditions for transport of substrates into the biofilm. The oxygen profile was measured in situ the nitrifying biofilm with a microelectrode and it was simulated with a one-dimensional mathematical model. We extended the model by adding a CSTR equation, to connect the reactor to the biofilm through the boundary conditions. We showed the dependence of the thickness of the mass transfer boundary layer on the bulk flow rate. Finally, we estimated the erosion parameter λ to increase the concordance between the measured and simulated profiles. This lead to a simple empirical relationship between λ and the flow rate. The data gathered by in situ microelectrode measurements can, together with the mathematical model, be used in predictive modeling and give more insight in the design of new carriers, with the ambition of making process operation more energy efficient.
DOI http://dx.doi.org/10.1016/j.mbs.2010.05.004 (link to publisher's fulltext)
Publisher Elsevier
Host/Issue Mathematical Biosciences;1
Volume 227
ISSN 0025-5564
Pages 1-11
Language eng (iso)
Subject(s) biofilm model
microelectrode
Moving Bed Biofilm Reactor
Oxygen profile
Sciences
Research Subject Categories::MATHEMATICS::Applied mathematics
Research Subject Categories::NATURAL SCIENCES::Biology::Other biology
Handle http://hdl.handle.net/2043/10487 (link to this page)

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