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Title: Morphological architecture of dual-layer hollow fiber for membrane distillation with higher desalination performance
Authors: Wang, P.
Teoh, M.M. 
Chung, T.-S. 
Keywords: Fully sponge-like structure
Heat and mass transfer model
Liquid entry pressure
Membrane distillation
Uniform finger-like macrovoids
Issue Date: 1-Nov-2011
Citation: Wang, P., Teoh, M.M., Chung, T.-S. (2011-11-01). Morphological architecture of dual-layer hollow fiber for membrane distillation with higher desalination performance. Water Research 45 (17) : 5489-5500. ScholarBank@NUS Repository.
Abstract: A new strategy to enhance the desalination performance of polyvinylidene fluoride (PVDF) hollow fiber membrane for membrane distillation (MD) via architecture of morphological characteristics is explored in this study. It is proposed that a dual-layer hollow fiber consisting of a fully finger-like macrovoid inner-layer and a sponge-like outer-layer may effectively enhance the permeation flux while maintaining the wetting resistance. Dual-layer fibers with the proposed morphology have been fabricated by the dry-jet wet spinning process via careful choice of dopes composition and coagulation conditions. In addition to high energy efficiency (EE) of 94%, a superior flux of 98.6 L m -2 h -1 is obtained during the direct contact membrane distillation (DCMD) desalination experiments. Moreover, the liquid entry pressure (LEP) and long-term DCMD performance test show high wetting resistance and long-term stability. Mathematical modeling has been conducted to investigate the membrane mass transfer properties in terms of temperature profile and apparent diffusivity of the membranes. It is concluded that the enhancement in permeation flux arises from the coupling effect of two mechanisms; namely, a higher driving force and a lower mass transfer resistance, while the later is the major contribution. This work provides an insight on MD fundamentals and strategy to tailor making ideal membranes for DCMD application in desalination industry. © 2011 Elsevier Ltd.
Source Title: Water Research
ISSN: 00431354
Appears in Collections:Staff Publications

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