Experimental determination of the dissolved oxygen boundary layer and mass transfer resistance near the fluid-biofilm interface

Tian C Zhang, P. L. Bishop

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

The thickness of the dissolved oxygen (DO) concentration boundary layer and the external mass transfer in a biofilm system were investigated using a microelectrode technique. Theoretical analysis was conducted to elucidate the mechanisms of the technique and to interpret the experimental measurements. The measured thicknesses of dissolved oxygen (DO) concentration boundary layers under different conditions demonstrated directly the effect of several factors on external mass transfer resistance. The experimental results indicated that (a) increasing substrate lending rate, (b) increasing fluid streamwise velocity and (c) increasing the roughness of the biofilm surface would decrease the external mass transfer resistance. The measured thickness of the DO concentration boundary layer was not in full agreement with theoretical correlations because the nonuniform biofilm created velocity and concentration fluctuations which resulted in the compression of concentration boundary layers. The microelectrode technique is a useful tool to study the external mass transfer resistance.

Original languageEnglish (US)
Pages (from-to)47-58
Number of pages12
JournalWater Science and Technology
Volume30
Issue number11
StatePublished - Dec 1 1994
Externally publishedYes

Fingerprint

Biofilms
Dissolved oxygen
biofilm
mass transfer
dissolved oxygen
Boundary layers
Mass transfer
boundary layer
Fluids
fluid
Microelectrodes
roughness
Surface roughness
compression
substrate
Substrates

Keywords

  • Biofilm
  • Boundary layer
  • Diffusion
  • External mass transfer resistance
  • Microelectrode
  • Reynolds number

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Experimental determination of the dissolved oxygen boundary layer and mass transfer resistance near the fluid-biofilm interface. / Zhang, Tian C; Bishop, P. L.

In: Water Science and Technology, Vol. 30, No. 11, 01.12.1994, p. 47-58.

Research output: Contribution to journalArticle

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