Model for effective diffusivities in aerobic biofilms
Model for effective diffusivities in aerobic biofilms
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DOI：
10.1061/(asce)0733-9372(1996)122:11(1023
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发表时间：
1996-11-01
期刊：
影响因子：
--
通讯作者：
Kocher, WM
中科院分区：
文献类型：
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作者：
Hinson, RK;Kocher, WM
需要可靠地估计生物膜中的有效扩散系数来计算可溶性基质的综合扩散和生物转化。对于好氧生物膜，有效扩散系数先前已经经验性地与生物膜干密度相关。生物膜主要由微生物细胞、不溶性胞外聚合物（EPS）和间隙水组成。因此，生物膜是一种天然的、异质的、多相的材料。这种材料的有效扩散性能，生物和非生物的，历史上已相关的相体积分数和扩散性能的各个阶段。本文提出了一个概念相似的模型，在好氧生物膜的有效扩散系数。该模型预测了微生物细胞和不溶性EPS浓度增加的单独影响。预测的有效扩散系数表示为相应的稀释水溶液值的分数。
Reliable estimates of effective diffusivities in biofilms are required to calculate the combined diffusion and biotransformation of soluble substrates. For aerobic biofilms, effective diffusivities have been previously correlated empirically to the biofilm dry densities. Biofilms consist primarily of microbial cells, insoluble extracellular polymeric substances (EPS), and interstitial water. Biofilms are therefore a natural, heterogeneous, multiphasic material. Effective diffusive properties of such materials, both biological and nonbiological, have historically been correlated to the phase-volume fractions and diffusive properties of the individual phases. This paper presents a conceptually similar model for effective diffusivities in aerobic biofilms. The model predicts separate effects for increasing concentrations of microbial cells and insoluble EPS. Predicted effective diffusivities are expressed as a fraction of the corresponding dilute aqueous values.