Preparation of patterned microfiltration membranes and their performance in crossflow yeast filtration

Gençal, Y.; Durmaz, Elif Nur; Çulfaz-Emecen, P. Zeynep

doi:10.1016/j.memsci.2014.11.041

Cited by 52 publications

(27 citation statements)

References 37 publications

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“…When the evaporation time was extended to 30 s, a homogeneous spongelike structure was generated. Similar behavior for membrane preparation has also been reported by other researchers . This is associated with a surface liquid layer on the cast film that emerges because of the intake of water from humid air .…”

Section: Resultssupporting

confidence: 84%

Correlation of the polymer hydrophilicity and membrane fabrication process on the properties of asymmetric membranes in a vapor‐induced phase‐inversion process

Zhu

Zhang

Zheng

et al. 2017

J of Applied Polymer Sci

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In this study, we sought a better understanding of how the hydrophilicity of a polymer affects the morphology and performance of membranes. Three types of polymer with different hydrophilicity solution systems were considered: poly(aryl ether ketone) bearing a hydroxyl group (PEK-OH-100) with N,N-dimethylformamide (DMF); poly(aryl ether ketone) bearing a 50% fraction hydroxyl group with DMF, and cardo poly(aryl ether ketone) with DMF. These systems were used to investigate the evolution of the morphology and variation in performance versus a change in the hydrophilicity of the polymer. In addition, the fundamental thermodynamic influence of the solution systems on the phase-inversion process was investigated by cloud-point measurement and Hansen solubility parameter theory to determine the role of polymer hydrophilicity on the stability of the polymer solution in humid surroundings. The performance of the membranes was tested via testing of the pure water flux, porosity, and rejection of bovine serum albumin (BSA) with respect to variations in the polymer hydrophilicity, evaporation time, relative humidity, and molecular weight of the polymer. The resulting optimal membrane exhibited a flux of 329.3 L m 22 h 21 and a 99.3% rejection of BSA at a relative humidity of 90% and an evaporation time of 3 s. The hydrophilic PEK-OH-100 membranes have promising applications in protein separation and the porous support of reverse-osmosis membranes and so on.

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Section: Resultssupporting

confidence: 84%

Correlation of the polymer hydrophilicity and membrane fabrication process on the properties of asymmetric membranes in a vapor‐induced phase‐inversion process

Zhu

Zhang

Zheng

et al. 2017

J of Applied Polymer Sci

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“…Therefore, it may be possible to increase MF performance by increasing the local shear rates near the membrane surface. On the other hand, a higher cross-flow velocity of a feed solution leads to increase energy demand which effects on economic aspects of the process [4,34,65]. However, according to Streit et al [23], for the same operational conditions such as transmembrane pressure, increasing the feed cross-flow velocity may reduce MF process time.…”

Section: Effect Of the Feed Flow Ratementioning

confidence: 99%

“…Indeed, it leads to the reduction of the productivity of the system and makes membrane cleaning a necessity. This causes in increasing operational costs and reduces a membrane's lifetime [33][34][35][36]. Based on literature review, it can be analyzed that flux decline during MF of biological suspensions is affected by a great number of factors, such as: (i) process parameters (transmembrane pressure, feed flow rate, and temperature) [1,2,4,6,12,16,[18][19][20][21][22][23]25,37,38], (ii) membrane properties (pore size and its distribution, hydrophilicity/hydrophobicity character) [1,3,6,14,21,25,37,39], (iii) feed solution properties (nature, bacterial cell mass, particle size, and pH) [11,12,21,22,38], and (iv) interaction between foulants and membranes [3,22].…”

Section: Introductionmentioning

confidence: 99%

Cross-Flow Microfiltration of Glycerol Fermentation Broths with Citrobacter freundii

Tomczak

Gryta

2020

Membranes

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This paper reports the study of the cross-flow microfiltration (MF) of glycerol fermentation broths with Citrobacter freundii bacteria. A single channel tubular ceramic membrane with a nominal pore size of 0.14 µm was used. It has been demonstrated that the MF ceramic membrane has been successfully applied to bacteria cell removal and to effectively eliminate colloidal particles from glycerol fermentation broths. However, due to fouling, the significant reduction of the MF performance has been demonstrated. In order to investigate the impact of transmembrane pressure (TMP) and feed flow rate (Q) on MF performance, 24 experiments have been performed. The highest steady state permeate flux (138.97 dm3/m2h) was achieved for 0.12 MPa and 1000 dm3/h. Fouling analysis has been studied based on the resistance-in series model. It has been found that the percentage of irreversible fouling resistance during the MF increases with increasing TMP and Q. The permeate flux regeneration has been achieved by membrane cleaning with 3 wt % NaOH and 3 wt % H3PO4 at 45 °C. The results of this study are expected to be useful in industrially employing the MF process as the first step of glycerol fermentation broth purification.

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“…For the first time, a patterned superhydrophobic PVDF membrane with porous micropillars was prepared via a micro-molding phase separation (µPS) technique. A similar technique has been used to create macro-patterned surfaces for pressure driven membranes (Çulfaz, Rolevink et al 2010, Çulfaz, Haddad et al 2011, Hashino, Katagiri et al 2011, Won, Lee et al 2012, Jamshidi Gohari, Lau et al 2013, Lee, Won et al 2013, Gençal, Durmaz et al 2015, Maruf, Greenberg et al 2016, Won, Jung et al 2016, ElSherbiny, Khalil et al 2017. However, pressure driven processes only involve a liquid-solid interface with a convective flow of liquid across the membrane.…”

Section: Introductionmentioning

confidence: 99%

Slippery for scaling resistance in membrane distillation: A novel porous micropillared superhydrophobic surface

et al. 2019

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Scaling in membrane distillation (MD) is a key issue in desalination of concentrated saline water, where the interface property between the membrane and the feed become critical. In this paper, a new slippery mechanism was explored as an innovative concept to understand the scaling behavior in membrane distillation for a soluble salt, NaCl. The investigation was based on a novel design of a superhydrophobic polyvinylidene fluoride (PVDF) membrane with micro-pillar arrays (MP-PVDF) using a micromolding phase separation (µPS) method. The membrane showed a contact angle of 166.0 ± 2.3° and the sliding angle of 15.8 ± 3.3°. After CF4 plasma treatment, the resultant membrane (CF4-MP-PVDF) showed a reduced sliding angle of 3.0 o. In direct contact membrane distillation (DCMD), the CF4-MP-PVDF membrane illustrated excellent anti-scaling in concentrating saturated NaCl feed. Characterization of the used membranes showed that scaling due to NaCl crystals and possible membrane wetting occurred on the control PVDF and MP-PVDF membranes, but not on the CF4-MP-PVDF membrane. To understand this phenomenon, a "slippery" theory was introduced and correlated the sliding angle to the slippery surface of CF4-MP-PVDF and its anti-scaling property. This work provides a well-defined physical and theoretical platform for investigating scaling problems in membrane distillation and beyond.

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Preparation of patterned microfiltration membranes and their performance in crossflow yeast filtration

Cited by 52 publications

References 37 publications

Correlation of the polymer hydrophilicity and membrane fabrication process on the properties of asymmetric membranes in a vapor‐induced phase‐inversion process

Correlation of the polymer hydrophilicity and membrane fabrication process on the properties of asymmetric membranes in a vapor‐induced phase‐inversion process

Cross-Flow Microfiltration of Glycerol Fermentation Broths with Citrobacter freundii

Slippery for scaling resistance in membrane distillation: A novel porous micropillared superhydrophobic surface

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