ORCID Profile
0000-0003-2432-2365
Current Organisation
Nanyang Technological University
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Publisher: CRC Press
Date: 21-04-2017
Publisher: Elsevier BV
Date: 05-2019
Publisher: Informa UK Limited
Date: 02-07-2016
Publisher: Elsevier BV
Date: 12-2021
DOI: 10.1016/J.WATRES.2021.117818
Abstract: Feed spacers are an essential part of spiral wound modules for reverse osmosis (RO). They create flow channels between membrane sheets and manipulate hydrodynamic conditions to control membrane fouling. In this work, additive manufacturing (Polyjet) was used to print novel sinusoidal spacers with wavy axial filaments connected by perpendicular (ST) or slanted (SL) transverse filaments. When tested with 2 g/L NaCl solution, conventional and SL spacers had similar flux while the ST spacer had about 5-7% lower flux. The pressure losses for ST and SL spacers increased by up to 3 folds depending on the flow condition. In the colloidal silica fouling and biofouling tests, the sinusoidal spacers showed lower membrane permeability decrease of 46% for ST, 41% for SL vs 56% for conventional and 26% for ST, 22% for SL vs 33% for conventional, respectively. Optical coherence tomography images from colloidal silica fouling and confocal images from biofouling tests revealed that fouling patterns were closely associated with the local hydrodynamic conditions. Overall, sinusoidal spacers showed promising results in controlling membrane fouling, but there is potential for further optimizations to reduce channel pressure loss.
Publisher: Elsevier BV
Date: 09-2017
Publisher: Research Publishing Services
Date: 2014
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 02-2016
No related grants have been discovered for Wen See Tan.