Influence of the process parameters on hollow fiber-forward osmosis membrane performances Tahir Majeed a , Sherub Phuntsho a , Soleyman Sahebi a , Jung Eun Kim a , Joon Khee Yoon b , Kwonil Kim b and Ho Kyong Shon a, * a School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology, Sydney (UTS), PO Box 123, Broadway, 2007 Australia (*E-mail: [email protected]) b Samsung Cheil Industries Inc. 332-2, Gocheon-Dong, Uiwang-Si, Gyeonggi-Do, 437-711, Republic of Korea Abstract Continued efforts are made in improving the performance of the low-cost forward osmosis (FO) membrane process which utilizes naturally available osmotic pressure of the draw solution (DS) as the driving force. Selection of a suitable DS and development of a better performing membrane remained the main research focus. In this study, the performance of a hollow fiber forward osmosis (HFFO) membrane was evaluated with respect to various operating conditions such as different cross-flow directions, membrane orientation, solution properties, and solution flow rates (Reynolds number). The study observed that operating parameters significantly affect the performance of the FO process. FO comparatively showed better performance at counter-current orientation. NaCl, KCl, and NH 4 Cl were evaluated as DS carrying common anion. Properties of the anionic part of the DS were found important for flux outcome, whereas reverse solute flux (RSF) was largely influenced by the properties of DS cationic part. FO was operated at different DS and feed solution (FS) flow rates and FO outcome was assessed for varying DS and FS Reynolds number ratio. FO showed better flux outcome as Re ratio for DS and FS decreases and vice versa. Results indicated that by adjusting FO processes conditions, HFFO membrane could achieve significantly lower specific RSF and higher water flux outcome. It was observed that using 2 M NaCl as DS and deionized water as FS, HFFO successfully delivered flux of 62.9 LMH which is significantly high compared to many FO membranes reported in the literature under the active layer-DS membrane orientation mode. Keywords: Hollow fiber forward osmosis (FO) membrane, flux, RSF, hydrophilicity, boundary layer effects, DS, flow rate 1. Introduction Recently, in the last decade, forward osmosis (FO) technology has shown its future potential for various water desalination and separation processes. Using the natural osmotic pressure potential of draw solution (DS), it is gaining popularity over other thermal and membrane
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Influence of the process parameters on hollow fiber-forward
osmosis membrane performances
Tahir Majeed
a, Sherub Phuntsho
a, Soleyman Sahebi
a, Jung Eun Kim
a, Joon Khee Yoon
b,
Kwonil Kimb and Ho Kyong Shon
a,*
a
School of Civil and Environmental Engineering, Faculty of Engineering and Information
Technology, University of Technology, Sydney (UTS), PO Box 123, Broadway, 2007
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