Mass transfer in corrugated-plate membrane modules. I. Hyperfiltration experiments

Waal, M.J. van der; Rácz, I.G.

doi:10.1016/0376-7388(89)89008-8

Cited by 45 publications

(20 citation statements)

References 18 publications

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“…It determines the retention of feed-substances, and thus which foulants might enter and pass the membrane matrix or might deposit on the membrane surface. Results on the influence of the membrane pore size on fouling so far are contradictory, because an increase in membrane pore size is reported to have no influence on fouling, to decrease fouling, or to increase fouling [24][25][26]. The membrane surface porosity also is different for membranes with different pore sizes, and therefore both factors be able to discriminate between the influences of each individual membrane property.…”

Section: Membrane Fouling 141 Membranes Propertiesmentioning

confidence: 93%

“…Ognier et al [15] and Cho et al [26] explained the rapid increase in resistance, for example those in Figure 3.5, by the gradual increase in local flux eventually exceeding J C , causing severe cake layer formation. Visual observation of the membranes in our study clearly did not show cake layer formation but gel layer formation as the source of the rapid increase in resistance, complying with findings in a recent study by Wang et al [20].…”

Section: Discussionmentioning

confidence: 99%

“…It was assumed that an intermediate relaxation while maintaining air-scouring, could not remove the local deposition of material in the valleys of the horizontal oriented corrugates. The work of van der Waal and Racz [26] showed that in case the corrugates are placed too close to each other and are positioned with a 90 o angle to the air flow, that the main flow over the surface does not reach the membrane surface in between the corrugates. Hence, air bubbles are unable to scour off the membrane surface in the areas between the corrugates.…”

Section: Long-term Experimentsmentioning

confidence: 99%

“…Membrane PVDF 0.3 µm showed a stable filtration resistance for more than 300 h of filtration. A characteristic two-stage resistance profile [15,20,25,26] was observed for PVDF 0.03 µm and PVDF 0.1 µm, although filtration was performed below J C . Fouling is not completely absent below J C in MBR.…”

Section: Figure 34mentioning

confidence: 99%

“…Corrugated membranes were used in filtration of emulsions [19,24], water with ceramic particles [25], or saline waters [20,26], but are not yet applied for activated sludge filtration in MBR. Furthermore, the main work is performed on tubular membranes (or flat-sheet membranes in a small channel) and not on flat-sheet submerged membranes.…”

Section: Corrugated Membranes a Short Reviewmentioning

confidence: 99%

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Influence of membrane properties on fouling in MBRs

Marel¹

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Section: Membrane Fouling 141 Membranes Propertiesmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Long-term Experimentsmentioning

confidence: 99%

Section: Figure 34mentioning

confidence: 99%

Section: Corrugated Membranes a Short Reviewmentioning

confidence: 99%

See 3 more Smart Citations

Influence of membrane properties on fouling in MBRs

Marel¹

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Microfiltration of yeast suspensions with self‐cleaning spiral vortices: Possibilities for a new membrane module design

Mallubhotla

Nunes

Belfort

1995

Biotech & Bioengineering

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A novel method of producing controlled vortices was used to reduce both concentration polarization and membrane fouling during microfiltration of Saccharomyces cerevisiae broth suspensions. The method involves flow around a curved channel at a sufficient rate so as to produce centrifugal instabilities (called Dean vortices). These vortices depolarize the build-up of suspended particles such as yeast cells at the membrane-solution interface and allow for increased membrane permeation rates. Various operating conditions under which such vortices effectively reduced cake build-up of suspended particles such as yeast cells at the membrane-solution interface and allow for increased membrane permeation rates. Various operating conditions under which such vortices effectively reduced cake build-up during microfiltration of 0 to 0.55 dry wt% yeast broth were investigated. Flux improvements of over 60% for 0.25 dry wt% yeast broth for flow with over that without Dean vortices were observed. This beneficial effect increased with increasing retentate flow rate and increasing transmembrane pressure and decreased with increasing concentration of suspended matter. Similar behavior was observed whether the cells were viable of killed. the improvement in flux in the presence over that in the absence of vortices correlated well with centrifugal force or azimuthal velocity squared. The relative cake resistances increased with reservoir yeast concentration. These values with vortices increased from 62% to 75% of that without vortices with increasing yeast concentration. The ratio of the cake thicknesses in the limiting case (at high feed concentration) was 3.25. These results suggest that self-cleaning spiral vortices could be effective in maintaining good and steady microfiltration performance with cell suspensions other than those tested.

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Solid‐Liquid Mass Transfer of an Array of Separated Parallel Corrugated Plates

et al. 2022

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A vertical array of corrugated copper plates was tested for its ability to conduct diffusion‐controlled liquid‐solid reactions. The mass transfer coefficient was investigated in terms of solution velocity, physical parameters of the solution, equivalent diameter of the channel, and array height. It was found that the mass transfer coefficient increases with increasing solution velocity and channel equivalent diameter while decreasing with increasing array height. Compared with flow through flat plates under the same conditions, flow across corrugated‐plate channels enhanced the mass transfer rate by a factor of 2–2.72. Dimensionless analysis was used to correlate the mass transfer data. The present work finds wide practical applications in enhancing mass transfer in many processes, such as membrane separation processes, electrochemical processes, heterogeneous liquid‐solid catalytic and photocatalytic reactions, and biochemical reactors in which enzymes or microorganisms are immobilized on such corrugated surfaces.

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Mass transfer in corrugated-plate membrane modules. I. Hyperfiltration experiments

Cited by 45 publications

References 18 publications

Influence of membrane properties on fouling in MBRs

Influence of membrane properties on fouling in MBRs

Microfiltration of yeast suspensions with self‐cleaning spiral vortices: Possibilities for a new membrane module design

Solid‐Liquid Mass Transfer of an Array of Separated Parallel Corrugated Plates

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