Transport of biocolloids in water saturated columns packed with sand: Effect of grain size and pore water velocity
- 作者：Vasiliki I. Syngouna ; Constantinos V. Chrysikopoulos ; gios@upatras.gr
- 关键词：Coliphages ; Bacteria ; Sand ; Grain size ; Pore water velocity ; Transport ; Deposition ; Mathematical modelling
- 刊名：Journal of Contaminant Hydrology
- 出版年：2012
- 期刊代码：43_01697722
- 类别：env
- 出版时间：15 March, 2012
- 卷：129-130
- 期：Complete
- 页码：11-24
- 文件大小：984 K
摘要
The main objective of this study was to evaluate the combined effects of grain size and pore water velocity on the transport in water saturated porous media of three waterborne fecal indicator organisms (Escherichia coli, MS2, and 桅X174) in laboratory-scale columns packed with clean quartz sand. Three different grain sizes and three pore water velocities were examined and the attachment behavior of Escherichia coli, MS2, and 桅X174 onto quartz sand was evaluated. The mass recoveries of the biocolloids examined were shown to be highest for Escherichia coli and lowest for MS2. However, no obvious relationships between mass recoveries and water velocity or grain size could be established from the experimental results. The observed mean dispersivity values for each sand grain size were smaller for bacteria than coliphages, but higher for MS2 than 桅X174. The single collector removal and collision efficiencies were quantified using the classical colloid filtration theory. Furthermore, theoretical collision efficiencies were estimated only for E. coli by the Interaction-Force-Boundary-Layer, and Maxwell approximations. Better agreement between the experimental and Maxwell theoretical collision efficiencies were observed.