Date of Completion
membrane separations; forward osmosis; pressure retarded osmosis; hollow fiber membrane; thin film composite; structure performance relationship; computational fluid dynamics
Jefferey R. McCutcheon
Leslie M. Shor
Richard S. Parnas
Douglas H. Adamson
Field of Study
Doctor of Philosophy
Osmotic processes have been considered sustainable solutions for extracting clean water and concentrating impaired water by forward osmosis (FO) and harvesting the osmotic pressure gradient for power generation via pressure retarded osmosis (PRO). Thin film composite (TFC) membranes are considered a preferred platform for osmotic processes wherein the selective and support layers can be tailored independently for preferred chemistry and structure. Hollow fiber TFC membranes in particular have garnered interests because of their high packing density. In this dissertation study, high performance TFC membranes were designed for applications in osmotic processes. Departing from previous hollow fiber membrane developments that focused on utilizing novel materials and fabrication methods, this dissertation focused on elucidating the fundamental structure-property-performance relationships of TFC hollow fiber membranes for osmotic processes. The impact of support layer structure was studied using lab-made hollow fiber supports. The impact of support surface pore size was systematically investigated using commercial ultrafiltration (UF) platforms. The results demonstrate that TFC hollow fiber FO membranes with excellent performance can be made with intrinsically hydrophilic materials, and can be produced at both lab-scale and module-scale with relative ease using off-the-shelf UF membranes. Finally, to optimize design and operation parameters in the hollow fiber FO process at various scales, a computational fluid dynamics model was developed to elucidate the inextricable link between various parameters and to optimize the design parameters for TFC hollow fiber membranes and modules for osmotic processes.
Ren, Jian, "Optimizing Design Parameters for Thin Film Composite Hollow Fiber Membranes and Modules for Osmotic Processes" (2017). Doctoral Dissertations. 1348.
Available for download on Thursday, March 15, 2018