EXPERIMENTAL-DETERMINATION OF THE DISSOLVED-OXYGEN BOUNDARY-LAYER AND MASS-TRANSFER RESISTANCE NEAR THE FLUID-BIOFILM INTERFACE

被引:49
作者
ZHANG, TC
BISHOP, PL
机构
关键词
BIOFILM; DIFFUSION; EXTERNAL MASS TRANSFER RESISTANCE; BOUNDARY LAYER; MICROELECTRODE; REYNOLDS NUMBER;
D O I
10.2166/wst.1994.0545
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 experiment;tl results indicated that (a) increasing substrate loading rate, (b) increasing fluid streamwise velocity and (c) increasing the roughness of the biofilm surface would decrease the externa 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.
引用
收藏
页码:47 / 58
页数:12
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