A study of flow field and concentration polarization evolution in membrane channels with two-dimensional spacers during water desalination

Amokrane, Mounir; Sadaoui, Djamel; Koutsou, C.P.; Karabelas, A.J.; Dudeck, Michel

doi:10.1016/j.memsci.2014.11.029

Cited by 71 publications

(40 citation statements)

References 40 publications

(88 reference statements)

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“…Indeed, there is an advantage (from the stand-point of reducing concentration polarization and possibly fouling) due to the narrow regions between the spacer filaments and membrane surface where shear stresses and mass transfer coefficients are increased [6,7]; however, it is a definite disadvantage to have distributed rather extensive areas of stagnant or nearly stagnant flow (at the contact lines of filaments with the membrane surface) where shear stress and mass transfer coefficients are low or even zero [6,7]. By taking into account these features of retentate spacers, the general target for the development of novel spacer geometries should be to avoid as much as possible contact lines between spacer and membrane surface (thus minimizing dead-flow zones) and to increase flow constrictions associated with increased flow velocities leading to increased transfer coefficients and shear stresses, as recently shown [23]. Of course one should be concerned about the possible negative effect of such geometric features on the pressure drop in the retentate flow channels.…”

Section: Design Of the Novel Spacer Geometrymentioning

confidence: 99%

“…A step in that direction was made in a simplified 2-D geometry [23] with useful results paving the way for full 3-D simulations. Consequently, in this study the boundary conditions are the no-slip and no-penetration conditions on the channel surfaces and similarly on the space filament surfaces.…”

Section: Tablementioning

confidence: 99%

“…Other disadvantages of some proposed novel spacer designs are related to their compressibility and the potential for damaging the membrane [22]. It should be noted that in a very recent numerical study of the full membrane-desalination problem [23], albeit in spatially restricted 2-D domain, the negative effects of membrane-spacer contact lines was confirmed; moreover, the benefits were demonstrated of placing cylindrical filaments at the mid-plane of retentate channels, thus creating symmetric flow constrictions, reducing CP effects.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel retentate spacer geometry for improved spiral wound membrane (SWM) module performance

Koutsou

Karabelas

2015

Journal of Membrane Science

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Section: Design Of the Novel Spacer Geometrymentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel retentate spacer geometry for improved spiral wound membrane (SWM) module performance

Koutsou

Karabelas

2015

Journal of Membrane Science

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“…A combination of water desalination technologies and renewable energy sources will most likely be needed to win such a challenge. Desalination is one of the most promising approaches to freshwater recycle (Amokrane et al 2015;Cohen-Tanugi et al 2014;Ghaffour et al 2013;Porada et al 2013;Wang and Karnik 2012). As nanotubes are innately insoluble in water (Fatemi and Foroutan 2015b), aqueous dispersion requires modification of the nanotube surface.…”

Section: Separation Of Gaseous Mixtures Using Cnt Bundlesmentioning

confidence: 99%

Review on carbon nanotubes and carbon nanotube bundles for gas/ion separation and water purification studied by molecular dynamics simulation

Fatemi

Foroutan

2015

Int. J. Environ. Sci. Technol.

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Water and air pollutants have huge impacts on the entire living system. In addition, the newly emerging nanopollutants, increasing global warming, and consequent climate changes are posing major threats to the freshwater or fresh air availability. This has made it urgent to invent an appropriate water/air treatment technology that removes nanopollutants and also desalinates water to a significant extent. Carbon-based nanomaterials have generated marvelous interest in a wide range of research activities due to their high adsorption capacities. Carbon nanotubes, carbon nanotube bundles, and related materials have potential applications in gas/ion separation and water purification. Recently, gas/ion separation and water purification through carbon-based nanomaterials have received increasing attention. This review summarizes the properties of carbon nanotubes and carbon nanotube bundles related to gas separation, ion separation, and water purification using molecular dynamics simulations. Membranes-based carbon nanomaterials show promise of water purification and gas separation. These attractive properties of carbon nanotubes-based and carbon nanotube bundles-based nanomaterials make them proper candidates for gas separation, gas molecular-sieving processes, and desalination purposes in nanoscale dimensions.

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“…A higher cross-flow rate leads to a higher biodegradable nutrient load increasing the rate of biofilm accumulation [28,85,[89][90][91][92][93][94][95]. Constant MFS operation at high cross-flow will increase (i) the accuracy of the FCP measurement and (ii) the rate of biofilm formation, enabling earlier warning of biofouling.…”

Section: Sensitive and Rapid Biofouling Detection In Mfsmentioning

confidence: 99%

The membrane fouling simulator: development, application, and early-warning of biofouling in RO treatment

Kim¹,

Nava-Ocampo²,

Loosdrecht³

et al. 2018

dwt

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Kruithof, Joop C.; Vrouwenvelder, Johannes S. Citation Kim LH, Nava-Ocampo, M, van Loosdrecht MCM, Kruithof JC, Vrouwenvelder JS (2018) The membrane fouling simulator: development, application, and early-warning of biofouling in RO treatment. DESALINATION AND WATER TREATMENT 126: 1-23. Available: http://dx. a b s t r a c tThe growing demand for fresh water has resulted in increasing use of reverse osmosis (RO) membrane systems for seawater desalination. A major operational problem of RO membrane filtration systems is biofouling -biomass growth causing an unacceptable membrane performance decline. Biofouling reduces the produced water quantity and quality and increases costs. The need for fouling remediation is mainly derived from destructive trial-and-error research with practical membrane modules. Therefore, a clear need existed for the development of a small-sized membrane fouling simulator (MFS) for systematic, low-cost studies. Since the introduction of the MFS in 2006, many articles have appeared which are evaluated in this review. The review describes (i) the location of biofouling in full-scale installations, (ii) development of MFS, (iii) characterization, reproducibility and representativeness of fouling development in the MFS, (iv) applications such as assessing the impact of anti-scalant or biocide dosage, phosphate limitation, feed spacer geometry and linear flow velocity and (v) early warning for biofouling. MFS studies have increased the understanding of biofouling and enabled improved practical membrane performance such as selection of dosed chemicals and feed spacer design. Future MFS studies are anticipated to enable the development of advanced biofouling control strategies.

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A study of flow field and concentration polarization evolution in membrane channels with two-dimensional spacers during water desalination

Cited by 71 publications

References 40 publications

A novel retentate spacer geometry for improved spiral wound membrane (SWM) module performance

A novel retentate spacer geometry for improved spiral wound membrane (SWM) module performance

Review on carbon nanotubes and carbon nanotube bundles for gas/ion separation and water purification studied by molecular dynamics simulation

The membrane fouling simulator: development, application, and early-warning of biofouling in RO treatment

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