Modified Forward Osmosis Membrane Preparation for Portable Water Purification Systems

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Mirkhalili, Mostafa | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47599 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Mousavi, Abbas; Ramazani Saadat Abadi, Ahmad
Abstract:
In this study, mesh-reinforced cellulose acetate (CA)-based membranes were prepared for forward osmosis (FO) by immersion precipitation. Casting composition, preparation conditions, evaporation time, coagulation bath temperature, annealing temperature, CA percent and 1,4-dioxane/acetone ratio were tested for membranes’ performance. Also, the results were compared with commercially CTA membranes. The FO membrane prepared under optimized conditions had a smooth surface similar to commercial ones. The most proper membrane (17.9 % polymer and 1,4-dioxane /acetone ratio 1.89) showed water flux of 9.3 L/m2.hr (LMH) and RSF of 0.536 mol NaCl/m2.hr. Using mesh in the membrane structure, different performance results were obtained. Reinforcement mesh creates macroscopic pores around mesh lines on the backside surface of the membrane. This caused higher water flux and RSF compared to membranes without mesh. Also, more pores formed in the membranes when mesh-embedded ones prepared with relatively low concentrations of casting solutions
Keywords:
Forward Osmosis ; Cellulosic Membrane ; Internal Concentration Polarization ; Mesh-Reinforced Membrane

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