Double-pass casting: A novel technique for developing high performance ultrafiltration membranes |
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Authors: | Huyen T. Dang Roberto M. Narbaitz Takeshi Matsuura |
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Affiliation: | 1. Department of Civil Engineering, University of Ottawa, 161 Louis Pasteur Private, Ottawa, ON, K1N 6N5 Canada;2. Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur Private, Ottawa, ON, K1N 6N5 Canada |
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Abstract: | Double-pass casting was evaluated as a technique to overcome hard-to-cast membranes or hard-to-mix solutions. Two types of polyethersulfone (PES) membranes were tested, one incorporating a hydrophilic surface modifying additive and the other with a hydrophobic one. It was found that the morphological improvement was more obvious for hydrophobic membranes since their solutions were not completely homogenous and hard-to-cast. The double-pass hydrophobic membranes had smoother surfaces and more porous support layers, resulting in higher fluxes, higher volume of treated water (67.4% increase) but decreased natural organic matters (NOM) rejection. The new casting approach produced hydrophilic membranes having a spongy structure (as opposed to finger-like cavities), yet they had similar NOM rejection, a 12.4% higher flux than the single-pass membranes prepared from the same dope. This is attributed to the quite homogenous hydrophilic casting solutions and to the performance of the original hydrophilic membranes (single-pass casting) that was relatively good. |
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Keywords: | PES-based ultrafiltration membranes Double-pass casting method Membrane surface characterization Flux performance |
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