Gh. Asachi Technical University of Iasi, D. Mangeron 73, Iasi, Romania.
Water Sci Technol. 2012;65(5):920-6. doi: 10.2166/wst.2012.938.
The study is focused on the external and internal mass transfers of lipids during their biodegradation process in a bioreactor with stationary basket bed of immobilized Bacillus spp. cells. By means of the lipid mass balance for a single particle of biocatalyst, considering the kinetic model adapted for the immobilized bacterial cells, specific mathematical models have been developed to estimate their mass flows in the liquid boundary layer surrounding the particle and inside the particle. The values of mass flows are significantly influenced by the internal diffusion velocity of lipids and the rate of their consumption, but also by the position inside the basket bed. These influences accumulated led to the appearance of a biological inactive region near the particle centre, its magnitude varying from 1.3 to 49.4% of the overall volume of particles.
本研究集中于在固定化 Bacillus spp. 细胞篮式生物反应器中进行生物降解过程中脂质的内外质量传递。通过对单个生物催化剂颗粒的脂质质量平衡，并考虑适应固定化细菌细胞的动力学模型，开发了特定的数学模型来估计它们在颗粒周围的液体边界层和颗粒内部的质量流。质量流的值受脂质的内部扩散速度和消耗速度的显著影响，也受篮式床内位置的影响。这些影响的累积导致在颗粒中心附近出现了一个生物惰性区域，其大小变化范围为颗粒总体积的 1.3%至 49.4%。
