Effect of diffusion limitations and floc size distributions on fermentor performance and the interpretation of experimental data
Effect of diffusion limitations and floc size distributions on fermentor performance and the interpretation of experimental data
复制标题
扩散限制和絮凝体尺寸分布对发酵罐性能的影响以及实验数据的解释
DOI：
10.1002/bit.260210209
复制
发表时间：
1979
期刊：
影响因子：
--
通讯作者：
F. Rahman
中科院分区：
文献类型：
--
作者：
B. Atkinson;F. Rahman
生物速率方程，描述了由微生物膜的底物吸收的总速率已被扩展到微生物絮体的形状参数的援助。探索了“固相”和液相扩散限制，发现其在很大程度上取决于维度特征尺寸k21 Vp/Ap。讨论的程序，其中K21 Vp/Ap可以确定从实验数据上的转换效率在一个完全混合的发酵罐和测量进行回收的絮凝物从发酵罐进行评估。絮凝体的尺寸分布示出影响发酵罐的性能特性时，一些絮凝体是足够大的表现出扩散限制，它的结论是，一个单一的平均絮凝体尺寸（K21 Vp/Ap）* 是足以表征一个给定的分布，至少当所有的絮凝体是几何相似的。絮凝体的平均尺寸与絮凝体尺寸分布的“表面”平均絮凝体尺寸密切对应。
The biological rate equation that describes the overall rate of substrate uptake by microbial films has been extended to microbial flocs with the aid of a shape parameter. The “solid”‐ and liquid‐phase diffusion limitations are explored and found to depend largely on a dimensionles characteristic size k21Vp/Ap. Procedures are discussed by which k21Vp/Ap can be determined from experimental data on the conversion efficiency in a completely mixed fermentor and measurements carried out on flocs recovered from the fermentor are assessed. Floc size distributions are shown to affect the performance characteristics of a fermentor when some of the flocs are sufficiently large to exhibit a diffusional limitation, and it is concluded that a single mean floc size (k21Vp/Ap)* is sufficient to characterize a given distribution, at least when all the flocs are geometrically similar. The mean floc size closely corresponds to the “surface” mean floc size of the floc size distributions.