Determination of pressure and velocity fields in ultrafiltration membrane modules used in drinking water production

Cano, G.; Steinle, P.; Daurelle, Jean-Vincent; Wyart, Y.; Glucina, K.; Bourdiol, D.; Moulin, Philippe

doi:10.1016/j.memsci.2012.11.082

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…They revealed the general trend of accumulation mechanisms of CNC at the membrane surface and the benefit of ultrasound on the mass transfer during the separation process. Some precedent works have allowed the measurement or prediction of the mean velocity field during filtration processes. − Nevertheless, to go further in the understanding of the concentration polarization phenomena induced by ultrafiltration, one piece of missing information until now is the velocity fields inside the accumulated layers and the corresponding development allowed to get access to this important parameter during the filtration process. With this knowledge, the spatiotemporal stability of the process and the related mechanisms would be easily predicted or controlled.…”

Section: Introductionsupporting

confidence: 66%

“…The optical device was composed of a Canon 65 mm MPE lens linked to a filter (LaVision) with a range of 545 to 800 nm. During the filtration, 200 pairs of images have been acquired with time lapses between two images of 150 μs considering the inlet velocity value of about 0.06 m s –1 and a particles displacement of around 8 pixels in the region of interest . To calculate the velocity field, specific processing based on adaptive cross-correlation between two successive frames, in small subdomain, has been used.…”

Section: Methodsmentioning

confidence: 99%

“…During the filtration, 200 pairs of images have been acquired with time lapses between two images of 150 μs considering the inlet velocity value of about 0.06 m s −1 and a particles displacement of around 8 pixels in the region of interest. 37 To calculate the velocity field, specific processing based on adaptive cross-correlation between two successive frames, in small subdomain, has been used. This technique requires a selection of interrogation windows size for the calculation of the velocity especially in regions of high gradients near the wall.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Structure, Rheological Behavior, and in Situ Local Flow Fields of Cellulose Nanocrystal Dispersions during Cross-Flow Ultrafiltration

Rey

Hengl

Baup

et al. 2019

ACS Sustainable Chem. Eng.

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This study focuses on investigating the phenomena involved in the formation of the concentration polarization and fouling layer during the cross-flow ultrafiltration process of cellulose nanocrystal (CNC) suspensions. Thanks to new cross-flow ultrafiltration cells specially designed, experiments of first time-resolved in situ Small Angle X-ray Scattering (SAXS) and second time-resolved in situ micro Particle Image Velocimetry (micro-PIV) at the vicinity of the membrane surface during filtration were performed. These two methods have given access to the concentration profiles and the velocity field as a function of the distance z from the membrane surface within the concentration polarization layers. The results obtained show an increase in particles concentration related to a decrease in the velocity within the layers formed during the process. This information linked to the rheological behavior of the suspensions permitted access to the calculated stress field within the concentrated layers during the cross-flow ultrafiltration process. Three different areas of shear stress/shear rate behaviors near the membrane surface have been emphasized. The important role of the rheological behavior and interparticle interaction in the dynamic evolution in space and time of the accumulated layers has been highlighted.

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Section: Introductionsupporting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Structure, Rheological Behavior, and in Situ Local Flow Fields of Cellulose Nanocrystal Dispersions during Cross-Flow Ultrafiltration

Rey

Hengl

Baup

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

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“…The use of CFD can deal well with concentration dependent properties [22][23][24] and is more accurate since it is based on first principles without simplifications. Numerical codes have been applied to study new membrane modules [25][26][27] , fouling [28] , gel formation [29,30] and concentration polarization in impinging jet cells [31] , parallel plate cells [21,23,32,33] and hybrid membrane cells [34][35][36][37] . They have also been used to study the effect of concentration polarization on protein separation [22,38] .…”

Section: Introductionmentioning

confidence: 99%

Membrane Characterization Based on PEG Rejection and CFD Analysis

Baldasso

Pinto

Silveira

et al. 2015

Separation Science and Technology

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Characterization of membrane pore size by experimental methods is usually done by the determination of the rejection of polymeric molecules having a range of sizes such as PEG. These experiments are affected by concentration polarization, which can lead to erroneous interpretation of the results, mainly because the concentration and the permeate flux change along the membrane surface. Additionally, experimental methods alone are insufficient to obtain the membrane pore size. To improve the current approach, numerical methods are used to understand mass transport limitations in rejection experiments and to predict the membrane pore size. In the current study, the results show that the ultrafiltration membrane has a MWCO of 20 kDa, different from the value set by the manufacturer (30 kDa). For the experimental conditions, concentration dependent viscosity and osmotic pressure do not influence the permeate flow rate or rejection. Moreover, the membrane pore size was found to be 2.59 nm. This value was determined comparing rejection values obtained by numerical and experimental results. Numerical analysis is also important to characterize the flow and mass transport in each point at membrane surface.

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“…[1][2][3] The pressure-driven ultrafiltration (UF) process has strengths in the areas of easy operation, low power consumption, and high separation efficiency. [4][5][6] In the drinking water treatment industry, UF membranes with both high permeate flux and durability are required to handle large amounts of water with a small footprint. Excellent fouling resistance is also needed to prevent the performance loss of the membrane, which occurs because of the attachment of retained particles during operation over time.…”

Section: Introductionmentioning

confidence: 99%

Fouling control through the hydrophilic surface modification of poly(vinylidene fluoride) membranes

Jang

Song

Kim

et al. 2014

J of Applied Polymer Sci

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A hydrophilic fouling-resistant poly(vinyl alcohol) (PVA) based polymer was synthesized by the etherification of PVA with monochloroacetic acid under alkaline conditions, and the polymer, PVA-OCH 2 COONa, was subsequently applied to modify a poly(-vinylidene fluoride) (PVDF) membrane to both enhance the hydrophilicity and provide fouling resistance. The successful etherification was confirmed by 13 C-NMR and attenuated total reflectance-Fourier transform infrared spectroscopy, whereas the synthesized polymer was shown by differential scanning calorimetry analysis to have an improved thermal stability over PVA. The physicochemical properties of the surfaces of the modified PVDF membranes were investigated with various analytical tools, including field emission scanning electron microscopy, atomic force microscopy, and contact angle analysis. Fouling tests with bovine serum albumin showed the PVA-OCH 2 COONa modified PVDF membrane to have both a higher pure water flux and a retarded decline in flux over the filtration period compared with the PVA-coated PVDF membrane. This study demonstrated that the modification of PVDF membranes with PVA-OCH 2 COONa could be an efficient method for enhancing their fouling resistance.

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Determination of pressure and velocity fields in ultrafiltration membrane modules used in drinking water production

Cited by 7 publications

References 18 publications

Structure, Rheological Behavior, and in Situ Local Flow Fields of Cellulose Nanocrystal Dispersions during Cross-Flow Ultrafiltration

Structure, Rheological Behavior, and in Situ Local Flow Fields of Cellulose Nanocrystal Dispersions during Cross-Flow Ultrafiltration

Membrane Characterization Based on PEG Rejection and CFD Analysis

Fouling control through the hydrophilic surface modification of poly(vinylidene fluoride) membranes

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