Velocity, stress and concentration fields revealed by micro-PIV and SAXS within concentration polarization layers during cross-flow ultrafiltration of colloidal Laponite clay suspensions

Rey, Candice; Hengl, Nicolas; Baup, Stéphane; Karrouch, Mohamed; Dufresne, Alain; Djeridi, Henda; Dattani, Rajeev; Pignon, Frédéric

doi:10.1016/j.memsci.2019.02.019

Cited by 20 publications

(23 citation statements)

References 41 publications

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“…In rheometric measurements, the rheological properties at membrane surfaces are measured. Rey et al, [ 108 ] monitored CP and membrane fouling using in situ small-angle X-ray scattering, and used in situ micro-particle image velocimetry to measure the rheometric properties at the membrane surface. Meng and Li [ 109 ] employed microscopic laser-induced fluorescence to study CP in the system.…”

Section: Reverse Osmosismentioning

confidence: 99%

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

et al. 2021

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Climate change, population growth, and increased industrial activities are exacerbating freshwater scarcity and leading to increased interest in desalination of saline water. Brackish water is an attractive alternative to freshwater due to its low salinity and widespread availability in many water-scarce areas. However, partial or total desalination of brackish water is essential to reach the water quality requirements for a variety of applications. Selection of appropriate technology requires knowledge and understanding of the operational principles, capabilities, and limitations of the available desalination processes. Proper combination of feedwater technology improves the energy efficiency of desalination. In this article, we focus on pressure-driven and electro-driven membrane desalination processes. We review the principles, as well as challenges and recent improvements for reverse osmosis (RO), nanofiltration (NF), electrodialysis (ED), and membrane capacitive deionization (MCDI). RO is the dominant membrane process for large-scale desalination of brackish water with higher salinity, while ED and MCDI are energy-efficient for lower salinity ranges. Selective removal of multivalent components makes NF an excellent option for water softening. Brackish water desalination with membrane processes faces a series of challenges. Membrane fouling and scaling are the common issues associated with these processes, resulting in a reduction in their water recovery and energy efficiency. To overcome such adverse effects, many efforts have been dedicated toward development of pre-treatment steps, surface modification of membranes, use of anti-scalant, and modification of operational conditions. However, the effectiveness of these approaches depends on the fouling propensity of the feed water. In addition to the fouling and scaling, each process may face other challenges depending on their state of development and maturity. This review provides recent advances in the material, architecture, and operation of these processes that can assist in the selection and design of technologies for particular applications. The active research directions to improve the performance of these processes are also identified. The review shows that technologies that are tunable and particularly efficient for partial desalination such as ED and MCDI are increasingly competitive with traditional RO processes. Development of cost-effective ion exchange membranes with high chemical and mechanical stability can further improve the economy of desalination with electro-membrane processes and advance their future applications.

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Section: Reverse Osmosismentioning

confidence: 99%

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

et al. 2021

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“…Refs. [48][49][50]70,71,79]). It corresponded to wall shear stress τ w ≈ 0.2 Pa (at 12 • C) and 0.1 Pa (at 42 • C).…”

Section: Filtration Protocolmentioning

confidence: 99%

“…This can be explained by an instant shift of the flexible polymeric filtration membrane away from the rigid membrane support due to the instant reduction of TMP [70,71] (although a low TMP of 10 kPa was maintained in order to reduce this effect during the pressure relaxation). The shift of the membrane towards positive z brought the inner sublayer of casein micelles, which was localized close to the membrane surface (z < 20 μm) and was not accounted for in the calculations of m ex and h g during the earlier filtration step, into the scope of SAXS analysis (z > 20 μm) [70,71], resulting in an apparent increase of m ex and h g . According to Fig.…”

Section: Amount Of Casein Micelles In the Concentration Polarization mentioning

confidence: 99%

Build-up and relaxation of membrane fouling deposits produced during crossflow ultrafiltration of casein micelle dispersions at 12 °C and 42 °C probed by in situ SAXS

Doudiès

Loginov

Hengl

et al. 2021

Journal of Membrane Science

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Distributed under a Creative Commons Attribution-NonCommercial-NoDerivatives| 4.0 International License

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“…where J z = J • ẑ is the longitudinal component of the particle flux in Equation (11). The overline denotes the cross-sectional average introduced in Equation ( 22).…”

Section: Asymptotic Matching and Particle Conservationmentioning

confidence: 99%

“…Moreover, flat sheet membranes can be operated at larger TMP, since they are commonly supported mechanically by plates or rigid porous spacers on the permeate side [8][9][10]. The FMS module with a transparent substrate sheet is also useful for monitoring flow behavior and fouling [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Geometrical Influence on Particle Transport in Cross-Flow Ultrafiltration: Cylindrical and Flat Sheet Membranes

Park

Nägele

2021

Membranes

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Cross-flow membrane ultrafiltration (UF) is used for the enrichment and purification of small colloidal particles and proteins. We explore the influence of different membrane geometries on the particle transport in, and the efficiency of, inside-out cross-flow UF. For this purpose, we generalize the accurate and numerically efficient modified boundary layer approximation (mBLA) method, developed in recent work by us for a hollow cylindrical membrane, to parallel flat sheet geometries with one or two solvent-permeable membrane sheets. Considering a reference dispersion of Brownian hard spheres where accurate expressions for its transport properties are available, the generalized mBLA method is used to analyze how particle transport and global UF process indicators are affected by varying operating parameters and the membrane geometry. We show that global process indicators including the mean permeate flux, the solvent recovery indicator, and the concentration factor are strongly dependent on the membrane geometry. A key finding is that irrespective of the many input parameters characterizing an UF experiment and its membrane geometry, the process indicators are determined by three independent dimensionless variables only. This finding can be very useful in the design, optimization, and scale-up of UF processes.

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Velocity, stress and concentration fields revealed by micro-PIV and SAXS within concentration polarization layers during cross-flow ultrafiltration of colloidal Laponite clay suspensions

Cited by 20 publications

References 41 publications

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

Frontiers of Membrane Desalination Processes for Brackish Water Treatment: A Review

Build-up and relaxation of membrane fouling deposits produced during crossflow ultrafiltration of casein micelle dispersions at 12 °C and 42 °C probed by in situ SAXS

Geometrical Influence on Particle Transport in Cross-Flow Ultrafiltration: Cylindrical and Flat Sheet Membranes

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