Flow uneven-distribution and its impact on performances of forward osmosis module

Qing, L.; Bilad, Muhammad Roil; Sun, Guofei; Jaafar, Juhana; Fane, Anthony G.

doi:10.1016/j.jwpe.2019.101014

Cited by 17 publications

(5 citation statements)

References 32 publications

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“…The main parameters affecting the FO process are solute concentration in both draw and feed solution, reverse draw solute flux [ 6 , 151 ] and membrane salt rejection [ 112 ]. In terms of hydrodynamics analysis, several studies [ 109 , 110 ] introduced the structural parameter ( S ), which is used to evaluate effect of the porous layer geometry on ICP:

where t s , T and ε represent the support layer membrane thickness, diffusive tortuosity and porosity, respectively.…”

Section: Module Performance Metricsmentioning

confidence: 99%

“…SWM modules have been used for industrial applications of seawater RO (SWRO) since the 1960s [ 3 ], and their use has been further extended to nanofiltration (NF) in the early 1980s [ 4 ]. For emerging osmotic membrane processes such as forward osmosis (FO) and pressure retarded osmosis (PRO), the development of SWMs is still at an early stage and is only limited to lab-scale studies [ 5 , 6 , 7 , 8 ]. Although some researchers report that the hollow fibre membrane configuration is more suitable for FO and PRO processes due to its higher packing density, self-mechanical support properties and better flow control on both sides of the membrane (i.e., lumen and outer surface of fibre) [ 9 , 10 ], a large number of studies published over the years have used flat sheet membranes for assessing FO and PRO processes [ 6 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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A Review of CFD Modelling and Performance Metrics for Osmotic Membrane Processes

et al. 2020

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Simulation via Computational Fluid Dynamics (CFD) offers a convenient way for visualising hydrodynamics and mass transport in spacer-filled membrane channels, facilitating further developments in spiral wound membrane (SWM) modules for desalination processes. This paper provides a review on the use of CFD modelling for the development of novel spacers used in the SWM modules for three types of osmotic membrane processes: reverse osmosis (RO), forward osmosis (FO) and pressure retarded osmosis (PRO). Currently, the modelling of mass transfer and fouling for complex spacer geometries is still limited. Compared with RO, CFD modelling for PRO is very rare owing to the relative infancy of this osmotically driven membrane process. Despite the rising popularity of multi-scale modelling of osmotic membrane processes, CFD can only be used for predicting process performance in the absence of fouling. This paper also reviews the most common metrics used for evaluating membrane module performance at the small and large scales.

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where t s , T and ε represent the support layer membrane thickness, diffusive tortuosity and porosity, respectively.…”

Section: Module Performance Metricsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review of CFD Modelling and Performance Metrics for Osmotic Membrane Processes

et al. 2020

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“…The Δ P s were set at 0.05, 0.10, 0.15 and 0.20 bar, corresponding to crossflow velocity of 0.5, 1.0, 3.9 and 5.5 cm/s, respectively. The range of cross-flow velocity applied in this study is within the one applied in commercial full-scale module [ 34 ]. It is worth noting that the Δ P was—due to set-up limitation—altered by changing the crossflow velocity by changing the rotation speed of the peristaltic pump ( Figure 1 B).…”

Section: Methodsmentioning

confidence: 99%

Effect of Membrane Materials and Operational Parameters on Performance and Energy Consumption of Oil/Water Emulsion Filtration

et al. 2021

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Membrane technology is one of reliable options for treatment of oil/water emulsion. It is highly attractive because of its effectiveness in separating fine oil droplets of <2 µm sizes, which is highly challenging for other processes. However, the progress for its widespread implementations is still highly restricted by membrane fouling. Most of the earlier studies have demonstrated the promise of achieving more sustained filtration via membrane material developments. This study addresses issues beyond membrane development by assessing the impact of membrane material (blend of polysulfone, PSF and polyethylene glycol, PEG), operational pressure, and crude oil concentration on the filtration performance of oil/water emulsion. The filtration data were then used to project the pumping energy for a full-scale system. Results show that fouling resistant membrane offered high oil/water emulsion permeability, which translated into a low energy consumption. The oil/water emulsion permeability was improved by three-fold from 45 ± 0 to 139 ± 1 L/(m2 h bar) for PSF/PEG-0 membrane in comparison to the most optimum one of PSF/PEG-60. It corresponded to an energy saving of up to ~66%. The pumping energy could further be reduced from 27.0 to 7.6 Wh/m3 by operation under ultra-low pressure from 0.2 to 0.05 bar. Sustainable permeability could be achieved when treating 1000 ppm oil/water emulsion, but severe membrane fouling was observed when treating emulsion containing crude oils of >3000 ppm to a point of no flux.

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“…Both experimental and computational fluid dynamics, working at the module scale, demonstrated the need to improve the understanding of process limitations that could be affected both by channel design and pressure balance in FO modules [ 237 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 ]. Further studies are required with specific focus on the concentration process with regard to practical operation and limitations.…”

Section: Tuning Fo Process To Tackle Current Limitations For Optimmentioning

confidence: 99%

Forward Osmosis as Concentration Process: Review of Opportunities and Challenges

et al. 2020

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In the past few years, osmotic membrane systems, such as forward osmosis (FO), have gained popularity as “soft” concentration processes. FO has unique properties by combining high rejection rate and low fouling propensity and can be operated without significant pressure or temperature gradient, and therefore can be considered as a potential candidate for a broad range of concentration applications where current technologies still suffer from critical limitations. This review extensively compiles and critically assesses recent considerations of FO as a concentration process for applications, including food and beverages, organics value added compounds, water reuse and nutrients recovery, treatment of waste streams and brine management. Specific requirements for the concentration process regarding the evaluation of concentration factor, modules and design and process operation, draw selection and fouling aspects are also described. Encouraging potential is demonstrated to concentrate streams more than 20-fold with high rejection rate of most compounds and preservation of added value products. For applications dealing with highly concentrated or complex streams, FO still features lower propensity to fouling compared to other membranes technologies along with good versatility and robustness. However, further assessments on lab and pilot scales are expected to better define the achievable concentration factor, rejection and effective concentration of valuable compounds and to clearly demonstrate process limitations (such as fouling or clogging) when reaching high concentration rate. Another important consideration is the draw solution selection and its recovery that should be in line with application needs (i.e., food compatible draw for food and beverage applications, high osmotic pressure for brine management, etc.) and be economically competitive.

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Flow uneven-distribution and its impact on performances of forward osmosis module

Cited by 17 publications

References 32 publications

A Review of CFD Modelling and Performance Metrics for Osmotic Membrane Processes

A Review of CFD Modelling and Performance Metrics for Osmotic Membrane Processes

Effect of Membrane Materials and Operational Parameters on Performance and Energy Consumption of Oil/Water Emulsion Filtration

Forward Osmosis as Concentration Process: Review of Opportunities and Challenges

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