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Title: A novel thin film composite hollow fiber osmotic membrane with one-step prepared dual-layer substrate for sludge thickening
Authors: Ng, Daniel Yee Fan
Wu, Bing
Chen, Yunfeng
Dong, Zhili
Wang, Rong
Keywords: Engineering::Civil engineering
Issue Date: 2019
Source: Ng, D. Y. F., Wu, B., Chen, Y., Dong, Z., & Wang, R. (2019). A novel thin film composite hollow fiber osmotic membrane with one-step prepared dual-layer substrate for sludge thickening. Journal of Membrane Science, 575, 98–108. doi:10.1016/j.memsci.2019.01.007
Journal: Journal of Membrane Science
Abstract: Forward osmosis (FO) membranes have received attention as an energy-efficient and low-cost technique in stream concentrating processes. In this work, a novel double-skinned hollow fiber thin film composite (TFC) FO membrane has been successfully fabricated, which consists of a one-step prepared dual layer substrate and a thin inner selective layer formed via interfacial polymerization. The substrate consists of a relatively dense ultrafiltration (UF) outer layer and a porous UF inner layer, both of which were constructed from polyethersulfone (PES) as the substrate material by using dual-layer co-extrusion technique. Compared to the commercial and reported double-skinned FO membranes, the FO membrane developed in this work exhibited a higher permeate flux with humic acid solution as feed. Furthermore, the double-skinned FO membrane was applied in concentrating activated sludge using 0.5 M NaCl as draw solution, and a permeate flux at 5.4 L/m2h was achieved after 5 h operation, which was higher than or comparable to those of the reported FO membranes. Membrane autopsies and foulant analysis suggested that the dense UF skin layer helped to reject greater-sized organic foulants (> 300 Da). This study shed light on the important fabrication features and promising application of the double-skinned hollow fiber TFC FO membrane in sludge concentration.
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2019.01.007
Rights: © 2019 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:IGS Journal Articles

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