Evaluation of bubble flow properties between flat sheet membranes in membrane bioreactor

Yamanoi, Ichiro; Kageyama, Koji

doi:10.1016/j.memsci.2010.05.006

Cited by 43 publications

(25 citation statements)

References 11 publications

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“…Similarly, Yamanoi and Kageyama also reported that the large bubbles (11–21 mm) with two‐dimensional amorphous shapes between membranes resulted in a larger shear stress compared to the bubbles (3.7–10 mm) smaller than the membrane clearance in an FSMBR. Culfaz et al found that large, cap‐shaped bubbles and slugs performed better than small bubbles in Hollow Fiber MBRs .…”

Section: Introductionmentioning

confidence: 81%

“…However, large amount of fundamental research has focused on tubular and hollow fiber membrane modules . Although growing, the literature on two‐phase flow and energy usage for the FS format is still, in general, quite limited . Furthermore, the method to produce slug bubbles for a commercial large‐scale FSMBR (i.e., 100 membrane sheets) was still needed.…”

Section: Introductionmentioning

confidence: 99%

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Novel aeration of a large‐scale flat sheet MBR: A CFD and experimental investigation

Wang

Field

2018

AIChE Journal

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Having previously established that the hydrodynamic effect introduced by slug bubbles is more effective and economic in fouling amelioration in flat sheet MBRs (FSMBR) than conventional bubbling, this work is focused on its implementation in a commercial FSMBR. The overall objective is to enhance the hydrodynamic effect on fouling control through the use of two‐stage large‐sized bubble development (coalescence and split). Computational Fluid Dynamics (CFD) was used to predict hydrodynamic features and substantial agreement was observed with experimental measurements. The critical height for bubble development space was determined to be circa 250 mm. Slug bubbles could be introduced into 14 channels, resulting in six‐fold stronger shear stress than that from single bubbles. Energy demand could be reduced by circa 50% compared with industry average usage and the shear stresses developed would, for most applications, be sufficient to ameliorate fouling. Furthermore, the specific air demand per permeate would be halved. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2721–2736, 2018

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Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Novel aeration of a large‐scale flat sheet MBR: A CFD and experimental investigation

Wang

Field

2018

AIChE Journal

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“…Studies have shown that slug bubbles had desirable hydrodynamic characteristics in fouling control and enhancing permeate flux and selectivity for different membrane modules in various membrane filtration processes (Zhang et al, 2011, Cui et al, 2003, Yamanoi and Kageyama, 2010, Mercier et al, 1997. The interactions between bubbles and membrane surface are the major shear stress mechanism working on hollow fiber membrane, especially for the vertically- shear stress and fouling for the submerged UF hollow fiber membrane.…”

Section: Air Spargingmentioning

confidence: 99%

Ultrafiltration Fouling: Impact of Backwash Frequency and Air Sparging

Wray

Bérubé

2014

Separation Science and Technology

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A bench-scale study was performed to optimize backwash frequency and air sparging conditions during ultrafiltration (UF) of natural surface waters in order to maximize water production and minimize irreversible fouling as well as operating and maintenance costs. Surface shear stress representing different air sparging conditions (continuous coarse bubble, discontinuous coarse bubble, and large pulse bubble sparging) was applied in combination with various backwash frequencies (0.5, 2 and 6 h) and fouling was assessed. Results indicated that air sparging with discontinuous coarse bubbles or large pulse bubbles significantly reduced the irreversible fouling rate while providing cost savings when compared to the baseline condition, which assumed a 0.5 h-backwash frequency and no air sparging during filtration. Cost savings were more pronounced at lower backwash frequencies, due to value associated with extra water produced over longer filtration times and longer membrane life resulted from fewer recovery chemical cleans because of lower irreversible fouling.

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“…Experimental studies on this topic have been scarcely reported, which could probably arise from either the difficulty in measuring the hydrodynamics (concerning intrusive impacts on the test flow (Yamanoi and Kageyama, 2010) and interference from sludge flocs (Bérubé et al, 2006;Chan et al, 2011)), or the onerous effort required to create a series of representative scenarios for the experiments (involving reactor building and baffle resizing). In this context, mathematical modeling studies have been conducted more often, with several simplified empirical models proposed to predict some collective properties of hydrodynamics (e.g.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic optimization of membrane bioreactor via baffle modification using computational fluid dynamics

Yan

Xiao

Liang

et al. 2015

Bioresource Technology

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Evaluation of bubble flow properties between flat sheet membranes in membrane bioreactor

Cited by 43 publications

References 11 publications

Novel aeration of a large‐scale flat sheet MBR: A CFD and experimental investigation

Novel aeration of a large‐scale flat sheet MBR: A CFD and experimental investigation

Ultrafiltration Fouling: Impact of Backwash Frequency and Air Sparging

Hydraulic optimization of membrane bioreactor via baffle modification using computational fluid dynamics

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