Direct measurement of unsteady-state variation of oxygen concentrations inside deactivated biofilm at intervals of 100 μm was conducted with oxygen microelectrodes. The diffusivity of each layer was estimated using an explicit finite-difference method. The results show that the distribution of the biofilm effective oxygen diffusivity varies from 25% Dw at the substratum of the biofilm to 90% Dw at the surface of the biofilm. This information provides experimental evidence necessary for biofilm modelling that could not be approached in the past, and will create a new dimension for evaluation of biofilm processes.
Determination of effective oxygen diffusivity in biofilms grown in a completely mixed biodrum reactor
Y.-C. Fu, T. C. Zhang, P. L. Bishop; Determination of effective oxygen diffusivity in biofilms grown in a completely mixed biodrum reactor. Water Sci Technol 1 October 1994; 29 (10-11): 455–462. doi: https://doi.org/10.2166/wst.1994.0792
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