Mass transfer phenomena in biofilm systems
Mass transfer phenomena in biofilm systems
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DOI：
10.2166/wst.2000.0466
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发表时间：
2000-02
影响因子：
2.7
通讯作者：
S. Wäsche;H. Horn;D. Hempel
中科院分区：
文献类型：
--
作者：
S. Wäsche;H. Horn;D. Hempel
数学模型允许在生物膜系统中模拟微生物生长和底物运输。然而，对于生物膜与体相之间的边界层中底物的传质，目前还缺乏认识。在生物膜管反应器中，在不同的基质和流体动力条件下培养了几种生物膜。用氧微电极测量了生物膜和边界层中的氧浓度分布。浓度层的厚度取决于表面结构，而表面结构又取决于生物膜生长阶段的底物负荷和水动力条件。生物膜密度和最大底物通量也受生长条件的影响。针对不同条件下生长的生物膜，建立了浓度层厚度的经验函数来描述边界层中的输运现象。
Mathematical models allow the simulation of microorganism growth and substrate transport in biofilm systems. Nevertheless there is still a lack of knowledge about the mass transfer of substrate in the boundary layer between biofilm and bulkphase. Several biofilms were cultivated under different substrate and hydrodynamic conditions in a biofilm tube reactor. Oxygen concentration profiles were measured with oxygen microelectrodes in the biofilm and in the boundary layer. The thickness of the concentration layer was found to depend on surface structure which depends on the substrate loading and the hydrodynamic conditions during the growth phase of the biofilm. Biofilm density and maximum substrate flux were also influenced by growth conditions. An empirical function for the concentration layer thickness was formulated for biofilms grown under different conditions to describe transport phenomena in the boundary layer.