Colloidal surface interactions and membrane fouling: Investigations at pore scale

Bacchin, Patrice; Marty, A.; Duru, Paul; Meireles, Martine; Aimar, Pierre

doi:10.1016/j.cis.2010.10.005

Cited by 112 publications

(103 citation statements)

References 68 publications

(87 reference statements)

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“…In spite of several numerical and experimental investigations, there are still important discrepancies between experimental observations and model predictions of critical velocities [7]. The main causes for these discrepancies are related to a complex and collective particle behavior (due to multi-body particle interactions) at the pore scale that cannot be described yet by classical Lagrangian or Eulerian modeling [4].…”

Section: Introductionmentioning

confidence: 95%

“…shear induced diffusion), the properties of particles [3] and particle/particle or particle/wall non-hydrodynamic surface interactions [4]. For micrometric particles, it has been shown that the colloidal interaction plays an important role in fouling and clogging events.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, our contribution to the study of pore fouling is to investigate the dynamic capture and deposition of particles at a pore entrance by using an experimental approach (experimental devices similar to those presented in [4,8]) for dead-end and crossflow filtration of latex suspensions. Then, this manuscript reports on different particle concentration, flowrate of suspensions (filtration velocity), particle flux density and physical-chemical conditions (effect of additional salt).…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of pore clogging by microparticles: Evidence for a critical flux density of particle yielding arches and deposits

Agbangla

Climent

Bacchin

2012

Separation and Purification Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 6835 b s t r a c tPrediction of pore fouling by microparticles is still challenging and remains a difficult step to optimize membrane and filtration processes. The scientific issue consists in determining the relevant operation parameters controlling the capture of particles and the clogging of the filter. In this study, we have developed for a dead-end and cross-flow filtration a poly-dimethylsiloxane (PDMS) device which allows direct observation of the clogging dynamics of microchannels (20 lm wide) by micrometric particles (5 lm diameter). The experiments highlight the formation of different 3D clogging patterns according to the filtration conditions (particle concentration, flowrate, particle flux density and physical-chemical conditions of suspension). Besides, we have determined under which specific conditions of filtration, the latex microparticles are captured and form arches, clusters or dendrites. For each type of structure, the temporal dynamics of the particle deposition are analyzed by means of the average thickness of deposit. The critical conditions for the formation of arches leading to deposit formation have been identified in term of a combination of operating conditions: the particle concentration and the particle velocity. A critical particle flux density yielding pore clogging is then observed and characterized. Studying these experimental results helps to identify pore clogging mechanisms: deposition, interception and bridging.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of pore clogging by microparticles: Evidence for a critical flux density of particle yielding arches and deposits

Agbangla

Climent

Bacchin

2012

Separation and Purification Technology

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“…Nowadays, it is impossible to know how the particles are captured by the membrane mainly because of the complex interplay between the particle-membrane interactions and the hydrodynamics occurring at pore scale in this process (Bacchin et al 2011;Bowen et al 1999;Kim and Zydney 2004). The interplay between surface interactions and hydrodynamics gives rise to interesting possibilities to limit the fouling that has been investigated via the critical flux concept (Bacchin et al 2006a): a flux below which fouling is limited because of surface interactions that overcome drag force pushing particles toward the membrane.…”

Section: Introductionmentioning

confidence: 99%

Clogging of microporous channels networks: role of connectivity and tortuosity

Bacchin

Derekx

Veyret

et al. 2013

Microfluid Nanofluid

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The aim of this work is to study the pore blocking by the use of microfluidic devices (microseparators) and numerical simulation approaches. The microseparators are made in PDMS and are constituted of an array of microchannels 20 lm wide with three types of structure: straight microchannels, connected microchannels (or aligned square pillars) and staggered square pillars in order to mimic merely the complexity of the flow encountered in filters or membranes (tortuosity, connectivity between pores). Direct observation with video microscopy of filtrations of 5 lm latex particles has been performed to examine the capture of particles. The results show a piling up of particles within the porous media leading to a clogging. The capture efficiency remains low (\0.1 %). In the case of filtration in the forest of pillars, the capture is faster and arises mainly between the pillars. The increase in tortuosity in the microseparator leads then to a rise of the clogging. It must be caused by the increase in critical trajectories leading to the capture of particles on the PDMS walls. At the same time, numerical simulations of filtration in parallel with microchannels have been performed in the same flow conditions with GeoDict software. The different kind of experimental deposit structure can be simulated, but there is still inaccuracy in the description of the accumulation kinetics. These discrepancies are probably due to the lack of accuracy to depict particle/particle colloidal interactions in simulations and the fact that re-suspension of particles after capture is not well described.

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“…The techniques of PDMS micro-separator preparation and the main surface properties of PDMS are reported in Bacchin et al (2011).…”

Section: Methodsmentioning

confidence: 99%

Impact of tortuous flow on bacteria streamer development in microfluidic system during filtration

et al. 2014

Self Cite

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The way in which bacterial communities colonize flow in porous media is of importance, but basic knowledge on the dynamic of these phenomena is still missing. The aim of this work is to develop microfluidic experiments in order to progress in the understanding of bacteria capture in filters and membranes. PDMS microfluidic devices mimicking filtration processes have been developed to allow a direct dynamic observation of bacteria across 10 or 20 lm width microchannels. When filtered in such devices, bacteria behave surprisingly: Escherichia coli, Pseudomonas aeruginosa or Staphylococcus aureus accumulate in the downstream zone of the filter and form large streamers which oscillate in the flow. In this study, streamer formation is put in evidence for bacteria suspension in non nutritive conditions in less than 1 h. This result is totally different from the one observed in same system with "inert" particles or dead bacteria which are captured in the bottleneck zone and are accumulated in the upstream zone. Observations within different flow geometries (straight channels, connected channels, and staggered row pillars) show that the bacteria streamer development is influenced by the flow configuration and, particularly by the presence of tortuosity within the microchannels zone. These results are discussed at the light of 3D flow simulations. In confined systems and in laminar flow, there is secondary flow (z-velocities) superimposed to the streamwise motion (in xy plane). The presence of the secondary flow in the microsystems has an effect on the bacterial adhesion. A scenario in three steps is established to describe the formation of the streamers and to explain the positive effect of tortuous flow on the development kinetics. V C 2014 AIP Publishing LLC. [http://dx

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Colloidal surface interactions and membrane fouling: Investigations at pore scale

Cited by 112 publications

References 68 publications

Experimental investigation of pore clogging by microparticles: Evidence for a critical flux density of particle yielding arches and deposits

Experimental investigation of pore clogging by microparticles: Evidence for a critical flux density of particle yielding arches and deposits

Clogging of microporous channels networks: role of connectivity and tortuosity

Impact of tortuous flow on bacteria streamer development in microfluidic system during filtration

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