Effect of Roughness and Thickness of Biofilms on External Mass Transfer Resistance

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by Tian C. Zhang, Univ of Cincinnati, Cincinnati, United States,
Paul L. Bishop, (M.ASCE), Univ of Cincinnati, Cincinnati, United States,
James T. Gibbs, Univ of Cincinnati, Cincinnati, United States,

Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment:

Abstract: The effect of roughness and thickness of biofilms on the dissolved oxygen (DO) concentration boundary layer thickness (DO CBLT) and the external mass transfer process in a biofilm system were investigated using a microelectrode technique. The experimental results indicated that (a) an increase of biofilm roughness would reduce the external mass transfer resistance; and (b) the absolute roughness increased with an increase in the biofilm maximum thickness, but this increase diminished when the biofilm thickness exceeded 1200 μm. The microelectrode technique is a useful tool to study the external mass transfer process.

Subject Headings: Thickness | Biofilm | Mass transfer | Dissolved oxygen | Load and resistance factor design | Oxygen transfer | Boundary layers | Diffusion |

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