Liu Y-Q, Liu Y, Tay J-H
Division of Environmental and Water Resources Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore.
Lett Appl Microbiol. 2005;40(5):312-5. doi: 10.1111/j.1472-765X.2005.01695.x.
To investigate the size effect of aerobic granules on mass transfer efficiency by introducing the effective factor and the modified Thiele modulus.
Batch experiments of aerobic granules with different sizes were conducted to study the size effect of granules on mass transfer resistance. Results showed that both specific substrate removal and biomass growth rates were size dependent, i.e. reduced rates were observed at big sizes. It was found that the diffusion resistance described by the effective factor and the Thiele modulus increased with the increase of the size of aerobic granules.
The effective factor should be controlled at values higher than 0.44 and the Thiele modulus lower than 1.05 for efficient mass transfer in aerobic granules.
Based on the coupled effective factor and Thiele modulus, an operation guidance including granule radius, kinetics of biomass and environmental conditions could be proposed for stable aerobic granulation.
通过引入有效因子和修正的西勒模数，研究好氧颗粒的尺寸效应及其对传质效率的影响。
进行了不同尺寸好氧颗粒的批次实验，以研究颗粒尺寸对传质阻力的影响。结果表明，特定底物去除率和生物量生长速率均与颗粒尺寸有关，即较大尺寸颗粒的速率降低。研究发现，有效因子和西勒模数所描述的扩散阻力随好氧颗粒尺寸的增加而增大。
为实现好氧颗粒中的高效传质，有效因子应控制在高于0.44的值，西勒模数应控制在低于1.05的值。
基于耦合的有效因子和西勒模数，可为稳定的好氧颗粒化提出包括颗粒半径、生物量动力学和环境条件在内的操作指南。
