Determination of effective oxygen diffusivity in biofilms grown in a completely mixed biodrum reactor

Y. C. Fu, T. C. Zhang, P. L. Bishop

Research output: Contribution to journalConference article

39 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)455-462
Number of pages8
JournalWater Science and Technology
Issue number10-11
Publication statusPublished - Jan 1 1994
EventProceedings of the IAWQ 2nd International Specialized Conference on Biofilm Reactors - Paris, Fr
Duration: Sep 29 1993Oct 1 1993



  • Biofilm
  • Density
  • Diffusion coefficient
  • Effective diffusivity
  • Microelectrode
  • Oxygen

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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