Impact of gas bubbling and backflushing on fouling control and membrane cleaning

Qaisrani, T.M.; Samhaber, Wolfgang

doi:10.1016/j.desal.2010.08.019

Cited by 82 publications

(45 citation statements)

References 21 publications

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“…Similar plateaus have been observed in submerged HF systems for sewage treatment and drinking-water treatment [191,210]. It has been observed that at high gas flowrates (namely, 40 L/h), a maximum flux was observed, after which the flux started to decline [212]. This phenomenon was explained by the relationship between the bubble size and air flowrate; since bubble size tends to increase with the air flowrate, the bubbles become so large after an optimum air flowrate that they start to prevent the liquid from reaching the membrane surface, a phenomenon that is also linked to slugging flow.…”

Section: Effect Of Gas Flowratesupporting

confidence: 60%

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: Effect Of Gas Flowratesupporting

confidence: 60%

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

et al. 2017

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“…There are four forces that act on the particle (Henry et al, 2012;Quasirani and Samhaber, 2011): an adhesive force F a , a drag force due to cross-flow F d , a lift force F l and a Brownian force F b . These forces are depicted in Fig.…”

Section: The Modelmentioning

confidence: 99%

“…For the long and efficient work of membrane filtration it is important to adopt certain methods or techniques to reduce membrane fouling. The fouling potential always exists in the process of ultrafiltration (UF), microfiltration (MF), and reverse osmosis (RO) as an inherited and avoidable element of the process of membrane separation (Chang et al, 1995;Quasirani and Samhaber, 2011). Fouling is due to the deposition of small colloidal particles on inner walls of membrane pores: standard blocking, blocking of membrane pore opening, complete blocking and buildup of particles in the form of a cake layer on membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of Displacement of Particles with Given Size on the Nonstationary Bulging Membrane as a Theoretical Model of Membrane Fouling

Gac¹,

Gradoń²

2013

Chemical and Process Engineering

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A simple model of behaviour of a single particle on the bulging membrane was presented. As a result of numerical solution of a motion equation the influence of the amplitude and frequency of bulging as well as the particle size on particle behaviour, especially its downstream velocity was investigated. It was found that the bulging of a membrane may increase the mean velocity of a particle or reinforce its diffusive behaviour, dependeing on the permeation velocity. The obtained results may help to design new production methods of highly fouling-resistant membranes.

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“…The most important of these difficulties is membrane fouling. It usually appears in such processes as ultrafiltration (UF), microfiltration (MF), and reverse osmosis (RO) as an inherited and avoidable element of the process of membrane separation (Chang et al, 1995;Quasirani and Samhaber, 2011). Fouling caused by the deposition of small colloidal particles on the inner walls of membrane pores, the blocking of membrane pore opening and the buildup of particles in the form of a cake layer on the membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Hollow Fibre Membrane Oscillations Against Fouling Process – a Numerical Study

Gac¹,

Gradoń²

2014

Chemical and Process Engineering

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The modelling of colloidal fouling and defouling of hollow fibre membranes in the presence of membrane oscillations is analysed by means of numerical simulations as an effect of complex coupling between hydrodynamic and surface forces. To describe the latter the Derjaguin-LandauVervey-Overbeek (DLVO) model has been employed. We have investigated the influence of various parameters of the process like flow rate, mean particle diameter, amplitude and frequency of the oscillations, and others, on the efficiency of the defouling process. The investigated parameters is close to that of a silica suspension in , a typical system modelling used to investigate membrane separation. On the basis of numerical simulation results e have defined an optimal set of parameters preventing membrane fouling.

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Impact of gas bubbling and backflushing on fouling control and membrane cleaning

Cited by 82 publications

References 21 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

Computational Analysis of Displacement of Particles with Given Size on the Nonstationary Bulging Membrane as a Theoretical Model of Membrane Fouling

Hollow Fibre Membrane Oscillations Against Fouling Process – a Numerical Study

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