The effect of filament orientation on critical flux and particle deposition in spacer-filled channels

Neal, Peter; Li, Haisu; Fane, Anthony G.; Wiley, Dianne E.

doi:10.1016/s0376-7388(02)00500-8

Cited by 104 publications

(66 citation statements)

References 14 publications

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“…10 as: The resistance ratio is the result of local variation as plotted in figure 4. One notes again that the deposit grows from the outlet of the membrane to the inlet as experimentally observed in numerous publications [9] or inside spacers elements [10]. An asymptotic limit of eq.…”

Section: Critical Deposit Formation (Cdf) Modelsupporting

confidence: 56%

A possible link between critical and limiting flux for colloidal systems: consideration of critical deposit formation along a membrane

Bacchin

2004

Journal of Membrane Science

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Section: Critical Deposit Formation (Cdf) Modelsupporting

confidence: 56%

A possible link between critical and limiting flux for colloidal systems: consideration of critical deposit formation along a membrane

Bacchin

2004

Journal of Membrane Science

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“…Wang et al (2005) did not observe pressure losses or fouling below the critical flux. Neal et al (2003) demonstrate that critical flux can, in part, be controlled by spacer orientation.…”

Section: Introductionmentioning

confidence: 82%

“…Neal et al (2003) performed experiments that illustrated the deposition pattern of particles in the vicinity of different filament orientations, but observed deposition patterns were not rigorously compared or correlated to computational simulations. Scott et al (2000) performed experiments in a crossflow test cell using flat and corrugated membranes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of micromixers and biocidal coatings on water-treatment membranes to minimize biofouling.

Webb¹,

James

Hibbs³

et al. 2009

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Biofouling, the unwanted growth of biofilms on a surface, of water-treatment membranes negatively impacts in desalination and water treatment. With biofouling there is a decrease in permeate production, degradation of permeate water quality, and an increase in energy expenditure due to increased cross-flow pressure needed. To date, a universal successful and cost-effect method for controlling biofouling has not been implemented. The overall goal of the work described in this report was to use high-performance computing to direct polymer, material, and biological research to create the next generation of water-treatment membranes. Both physical (micromixers -UV-curable epoxy traces printed on the surface of a watertreatment membrane that promote chaotic mixing) and chemical (quaternary ammonium groups) modifications of the membranes for the purpose of increasing resistance to biofouling were evaluated. Creation of low-cost, efficient water-treatment membranes helps assure the availability of fresh water for human use, a growing need in both the U. S. and the world. 3 EXECUTIVE SUMMARYSection 1: Biofouling, the unwanted growth of biofilms on a surface, of water-treatment membranes has a negative economic impact in desalination and water treatment. With biofouling there is a decrease in permeate production and an increase in energy expenditure due to increased cross-flow pressure needed. Biofouling leads to increased cleaning expenditures, it accelerates the degradation of the membranes, and degrades the water quality of the permeate. To date, a universal successful and cost-effect method for controlling biofouling has not been implemented. The goal of this project is to use high-performance computing to direct polymer, material, and biological research to create the next generation of water-treatment membranes. Both physical (micromixers -UV-curable epoxy traces printed on the surface of a watertreatment membrane that promote chaotic mixing) and chemical (quaternary ammonium groups) modifications of the membranes for the purpose of increasing resistance to biofouling were evaluated.Section 2: Features (micromixers) that promote chaotic mixing were fabricated on reverseosmosis membrane surfaces and evaluated using computational models and laboratory experiments to determine their effectiveness in reducing biofouling. Computational fluid dynamics models of membrane feed channels were developed using different patterns of micromixers on the membrane surface. The shear-stress distribution along the membrane surface was simulated for steady flows along the different micromixer configurations. In addition, the hypothetical mass transfer of a tracer from the membrane surface was used as a metric to compare the amount of scouring and mixing in configurations with and without micromixers. Epoxy micromixers were printed directly onto membrane surfaces, and different patterns were evaluated experimentally. Fluorescence hyperspectral imaging results showed that regions of simulated high shear stress on the membrane co...

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“…Neal et al [20] used the DOTM technique to determine the effect of spacer orientation on this critical flux. They found that spacers significantly increase critical flux for a flow laden with 6.4μm latex beads.…”

Section: Figure 1: Sketch Of Net-type Spacer's Structurementioning

confidence: 99%

DEM simulations of initial deposition of colloidal particles around non-woven membrane spacers

Chaumeil¹,

Crapper²

2013

Journal of Membrane Science

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The modelling of the initial deposition on membrane spacers of colloidal size particles immersed in a liquid is investigated using the Discrete Element Method (DEM). The ability of this method to model surface interactions allows the modelling of particle agglomeration and deposition at the particle scale. The numerical model adopts a mechanistic approach to represent the forces involved in colloidal suspension by including near wall drag retardation, surface interaction and Brownian forces. The model is implemented using the commercially available DEM package EDEM 2.3®, so that results can be replicated in a standard and user-friendly framework. The effect of different spacer orientation with respect to feed direction is examined and results show that deposition of particles are increased around the spacer joints when feed orientation bisects the spacers' angle; when one of the spacer filaments is aligned with the feed inflow deposition occurs exclusively and uniformly on it. Simulation results demonstrate the validity of such method to describe the small-scale behaviour of micro-particles around spacers.

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The effect of filament orientation on critical flux and particle deposition in spacer-filled channels

Cited by 104 publications

References 14 publications

A possible link between critical and limiting flux for colloidal systems: consideration of critical deposit formation along a membrane

A possible link between critical and limiting flux for colloidal systems: consideration of critical deposit formation along a membrane

Analysis of micromixers and biocidal coatings on water-treatment membranes to minimize biofouling.

DEM simulations of initial deposition of colloidal particles around non-woven membrane spacers

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