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Dynamics of biofilm detachment in biofilm airlift suspension reactors
L Tijhuis1, M C van Loosdrecht, J J Heijnen
1Department of Biochemical Engineering, Kluyver Laboratory for Biotechnology, Delft University of Technology, Julianalaan 67, NL-2628 BC Delft, The Netherlands.
Abstract:
The dynamic change in the overall detachment rate of spherical biofilms in a biofilm airlift suspension reactor was measured after a downshift of the substrate loading rate to zero while all other conditions remained constant. In contrast to the expectations, the overall detachment rate decreased rapidly to a nearly stable level. Correlations available from literature were not able to describe this phenomenon. Concepts were formulated which can describe the observations from this study. Research under dynamic conditions and careful monitoring of the biofilm surface area and biofilm morphology are necessary to elucidate and discriminate biofilm detachment mechanisms.
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