Use of air sparging to improve backwash efficiency in hollow-fiber modules

Serra, Christophe A.; Durand-Bourlier, L.; Clifton, Michaël; Moulin, Philippe; Rouch, Jean-Christophe; Aptel, Philippe

doi:10.1016/s0376-7388(99)00106-4

Cited by 55 publications

(31 citation statements)

References 19 publications

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“…It has been reported that air scouring during backwashing can assist fouling removal and improve backwash efficiency [289,295]. While the backwashing is expected to detach the cake layer from the fibers, air scouring loosens the deposits and carries them from the membrane surface into the bulk fluid [289,295].…”

Section: Backwashingmentioning

confidence: 99%

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The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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Abstract:The submerged membrane filtration concept is well-established for low-pressure microfiltration (MF) and ultrafiltration (UF) applications in the water industry, and has become a mainstream technology for surface-water treatment, pretreatment prior to reverse osmosis (RO), and membrane bioreactors (MBRs). Compared to submerged flat sheet (FS) membranes, submerged hollow fiber (HF) membranes are more common due to their advantages of higher packing density, the ability to induce movement by mechanisms such as bubbling, and the feasibility of backwashing. In view of the importance of submerged HF processes, this review aims to provide a comprehensive landscape of the current state-of-the-art systems, to serve as a guide for further improvements in submerged HF membranes and their applications. The topics covered include recent developments in submerged hollow fiber membrane systems, the challenges and developments in fouling-control methods, and treatment protocols for membrane permeability recovery. The highlighted research opportunities include optimizing the various means to manipulate the hydrodynamics for fouling mitigation, developing online monitoring devices, and extending the submerged HF concept beyond filtration.

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Section: Backwashingmentioning

confidence: 99%

“…While the backwashing is expected to detach the cake layer from the fibers, air scouring loosens the deposits and carries them from the membrane surface into the bulk fluid [289,295]. The impact of aeration during backwashing on membrane fouling during seawater filtration was investigated by Ye at al.…”

Section: Backwashingmentioning

confidence: 99%

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

et al. 2017

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“…Typically air sparging is applied only during backwash for UF production of drinking water. Several studies have shown that the use of air-assisted backwash can improve foulant removal efficiency and shorten the backwash time required to completely remove the cake layer (Remize et al, 2010, Bessiere et al, 2009, Serra et al, 1999. In particular, the application of large pulse bubbles (i.e., volume > 100 mL) may provide an energy-and cost-efficient means of controlling membrane fouling (Jankhah and Bé rubé , 2013).…”

Section: List Of Tablesmentioning

confidence: 99%

“…However, membrane fouling is still one of the major constraints in UF application, particularly in filtration of natural surface water, since it contains considerable amount of natural organic matter (NOM), which is the main UF foulant (Costa et al, 2006, Amy, 2008, Howe and Clark, 2002. Membrane fouling has become one of the main concerns in UF because it lowers the permeate flux and reduces water production due to the consumption of permeate during backwash (Serra et al, 1999).…”

Section: Ultrafiltration Membrane Foulingmentioning

confidence: 99%

“…Membrane fouling lowers the filtration performance and increase the operating as well as maintenance costs, due to consumption of permeate during backwashing (Serra et al, 1999), increased energy consumption by permeate pumps to overcome increased resistance, and chemical cleaning processes which shortens membrane lifetime (Qu et al, 2012, Gahleitner et al, 2014. Therefore, it is necessary to identify the operating conditions that can optimize full-scale operation (Bé rubé et al, 2008).…”

Section: Operating Conditionsmentioning

confidence: 99%

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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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Fouling in Membrane Bioreactors

Kola

Chen

2013

Encyclopedia of Membrane Science and Technology

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Membrane bioreactors (MBRs) have become increasingly popular in water and wastewater treatment as an alternative to the conventional activated sludge process. However, membrane fouling is still a key issue in the MBR system that significantly influences the system operation and maintenance cost. In this paper, key factors influencing membrane fouling are reviewed and discussed. The fundamental fouling mechanisms of the MBR system are explored via analyzing different fractions of the MBR feed solution and their corresponding fouling propensities. With the aid of fouling layer fractionation and advanced characterization techniques, the preferential deposition of different foulants is clearly highlighted. Furthermore, different operation conditions and parameters for fouling limitation and removal are reviewed and compared.

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Use of air sparging to improve backwash efficiency in hollow-fiber modules

Cited by 55 publications

References 19 publications

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

The Performance and Fouling Control of Submerged Hollow Fiber (HF) Systems: A Review

Ultrafiltration Fouling: Impact of Backwash Frequency and Air Sparging

Fouling in Membrane Bioreactors

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