Understanding the effect of transverse vibration on hollow fiber membranes for submerged forward osmosis processes

Low, Kay Siang; Ng, Daniel Yee Fan; Goh, Kunli; Li, Ye; Wang, Rong

doi:10.1016/j.memsci.2020.118211

Cited by 7 publications

(6 citation statements)

References 33 publications

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“…At a higher concentration, internal concentration polarisation (ICP) was severe and played a dominant role in flux (Tang, et al ., 2010). At the same time, when the FS concentration rose rapidly, it can also lead to a decrease of water flux because of the higher external concentration polarisation (ECP) (Low, et al ., 2020).…”

Section: Resultsmentioning

confidence: 99%

Forward osmosis concentration of high viscous polysaccharides of Dendrobium officinale: Process optimisation and membrane fouling analysis

Cai

Zhong

Chu

et al. 2021

Int J of Food Sci Tech

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Polysaccharides of Dendrobium officinale (DOP) need to be dehydrated and concentrated after extraction for further application. They are usually concentrated by thermal evaporation which consumes great energy. However, high viscosity of DOP makes the concentration more difficult even using non-thermal membrane technologies such as nanofiltration (NF) or reverse osmosis (RO). In this study, effects of process conditions, such as membrane orientations, draw solutions and their concentrations, and flowrate on forward osmosis (FO) concentration of viscous DOP were studied. Active layer to feed solution mode, cross flowrate at 240 mL min −1 , and draw solution of 3 M NaCl have been found as the optimal conditions. Foulants on the membrane surface with loose structure could be easily cleaned and removed by hydraulic flushing. DOP concentrated by FO achieved almost 1.3 times at the same time compared with that in NF and RO. DOP could be further concentrated for 1.5 folds at longtime without significant decrease in water flux. In addition, slight reverse solutes in FO process could reduce the viscosity of high viscous DOP, which was good for concentration. Accordingly, FO is a potential technology for concentration of high viscous polysaccharides such as DOP.

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Section: Resultsmentioning

confidence: 99%

Forward osmosis concentration of high viscous polysaccharides of Dendrobium officinale: Process optimisation and membrane fouling analysis

Cai

Zhong

Chu

et al. 2021

Int J of Food Sci Tech

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“…Other than draw solutions, tailoring in module design to optimize energy efficiency and fouling resistance have been studied. The module design modifications include configuration [ 338 ], length of module [ 339 ], operating parameter [ 340 ], and use of different operation modes [ 341 ] and the transverse vibration [ 342 ]. Akhtar et al reported that the separation performance of FO membrane with counter-current flow configuration had a 7% higher water flux than the co-current flow configuration [ 338 ].…”

Section: Applications Of Hollow Fiber Membranesmentioning

confidence: 99%

“…Next, vibrating submerged membranes received increasing attention because turbulence created on the membrane surface effectively interrupts the fluid boundary layer, thus giving better fouling control [ 343 ]. Low et al revealed that using transverse vibration can significantly improve water flux while inhibiting the external concentration polarization of hollow fiber membranes [ 342 ].…”

Section: Applications Of Hollow Fiber Membranesmentioning

confidence: 99%

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

Lau

Soh

et al. 2022

Membranes

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The aggravation of environmental problems such as water scarcity and air pollution has called upon the need for a sustainable solution globally. Membrane technology, owing to its simplicity, sustainability, and cost-effectiveness, has emerged as one of the favorable technologies for water and air purification. Among all of the membrane configurations, hollow fiber membranes hold promise due to their outstanding packing density and ease of module assembly. Herein, this review systematically outlines the fundamentals of hollow fiber membranes, which comprise the structural analyses and phase inversion mechanism. Furthermore, illustrations of the latest advances in the fabrication of organic, inorganic, and composite hollow fiber membranes are presented. Key findings on the utilization of hollow fiber membranes in microfiltration (MF), nanofiltration (NF), reverse osmosis (RO), forward osmosis (FO), pervaporation, gas and vapor separation, membrane distillation, and membrane contactor are also reported. Moreover, the applications in nuclear waste treatment and biomedical fields such as hemodialysis and drug delivery are emphasized. Subsequently, the emerging R&D areas, precisely on green fabrication and modification techniques as well as sustainable materials for hollow fiber membranes, are highlighted. Last but not least, this review offers invigorating perspectives on the future directions for the design of next-generation hollow fiber membranes for various applications. As such, the comprehensive and critical insights gained in this review are anticipated to provide a new research doorway to stimulate the future development and optimization of hollow fiber membranes.

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“…The conventional method used to limit concentration polarization in FO processes is the use of high cross-flow velocities. ,− So far, the number of studies on other shear-enhancing approaches such as membrane vibration , and aeration , remains very limited. Furthermore, the submerged configuration has not yet been fully studied for forward osmosis even though such configuration has been widely used in microfiltration and ultrafiltration processes for wastewater treatment and complex, viscous feeds. − The submerged configuration provides good mixing of the bulk solution on one side of the membrane, reducing length-dependent gradient effects along the membrane.…”

Section: Introductionmentioning

confidence: 99%

“…There are a few studies conducted on membrane vibration for flat sheet FO membranes using relatively high vibration frequencies of 16–250 Hz. ,, However, further insights into the effect of membrane vibration on the mass transfer on both the active and support layers of the flat sheet membrane have not been explored. Recently, Low et al provided a thorough assessment on an FO hollow fiber membrane including the effect of vibrational parameters as well as FO conditions such as membrane orientation and draw solutes on flux. This is supplemented by the mass transfer coefficients at these different conditions.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Mass Transfer Improvement of a Submerged Forward Osmosis System with Vibration-Induced Shear Enhancement

Chai

Razmjou

et al. 2021

Ind. Eng. Chem. Res.

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External and internal concentration polarizations are critical bottlenecks in the application of forward osmosis. This study examines the overall mass transfer performance of a submerged membrane vibration system for flat sheet and hollow fiber configurations. The application of membrane vibration at 14.3 Hz resulted in a flux enhancement of at least 43% at different membrane orientations and configuration modes in the flat sheet module. Interestingly, it was found that the membrane vibration can improve the shear force in the channel side of a plate-and-frame configuration, with the presence of a mesh spacer, with up to a 49% increase in the overall mass transfer coefficient at a vibration frequency of 21.8 Hz. Variation of shear forces and configurations revealed complex interactions between internal and external concentration polarizations. In addition, the application of membrane vibration can mitigate the effects of accelerated cake-enhanced concentration polarization as observed by a stable flux performance at 5 L/m2 h over 17 h as opposed to a flux decline to 3 L/m2 h for the case without vibration using a seawater model feed with the presence of silica colloids.

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Understanding the effect of transverse vibration on hollow fiber membranes for submerged forward osmosis processes

Cited by 7 publications

References 33 publications

Forward osmosis concentration of high viscous polysaccharides of Dendrobium officinale: Process optimisation and membrane fouling analysis

Forward osmosis concentration of high viscous polysaccharides of Dendrobium officinale: Process optimisation and membrane fouling analysis

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

Insights into the Mass Transfer Improvement of a Submerged Forward Osmosis System with Vibration-Induced Shear Enhancement

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