Effect of shear rate within the spinneret on morphology, separation performance and mechanical properties of ultrafiltration polyethersulfone hollow fiber membranes

Chung, Tai‐Shung; Qin, Jianjun; Gu, Juan

doi:10.1016/s0009-2509(99)00371-1

Cited by 139 publications

(70 citation statements)

References 24 publications

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“…The method of preparation involved is the same as that of the 'phase inversion' method employed in earlier works as reported by other researchers (Wang et al 2004;Chung et al 2000), and the process of hollow fiber spinning is schematically shown in Figure 1. The formulated dope and bore fluid were filtered by a metal filter (15 mm) and degassed before spinning to remove the particles and gas bubbles that may exist in the dope.…”

Section: Spinning Of Pvdf Hollow Fiber Membranesmentioning

confidence: 99%

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Hou

Wang

et al. 2009

Water Science and Technology

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Fabrication of polyvinylidene fluoride (PVDF) hydrophobic asymmetric hollow fiber membranes was studied by introducing inorganic salt LiCl and water soluble polymer polyethylene glycol (PEG) 1500, using N,N-dimethylacetamide (DMAc) as solvent and tap water as the coagulation medium. The membranes properties also were tested and characterized. It is found that the nonsolvent additive can increase membranes porosity, ether LiCl or PEG 1500. Because of the addition of PEG 1500, the PVDF membranes obtained a rough topography on the membrane surface and the contact angle of the PVDF membranes increased to 113.508 compared to 89.828 of the PVDF membranes spun without an additive. During direct contact membrane distillation (DCMD) of 0.6 M sodium chloride solution, the PVDF membranes spun with PEG 1500 as a non-solvent additive achieved higher water permeation flux compared to the membranes spun from PVDF/DMAc and PVDF/DMAC/LiCl dopes, but the latter two membranes exhibited higher salt rejection rate.

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Section: Spinning Of Pvdf Hollow Fiber Membranesmentioning

confidence: 99%

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Hou

Wang

et al. 2009

Water Science and Technology

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“…These aspects include the composition of the dope solution, the composition of the bore liquid and external coagulant, quench conditions, the air gap length, bore fluid flow rate, humidity, and fiber take-up speed. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] When the polymer dope is pumped through the spinneret during hollow fiber spinning, the highest shear stress is located at the wall of the spinneret. Thus, the rheological conditions existing in the spinneret during hollow fiber spinning are essential to control the final membrane morphology and properties.…”

Section: Introductionmentioning

confidence: 99%

Power‐law polymer solution flow in a converging annular spinneret: Analytical approximation and numerical computation

Tung¹,

Li²,

Hu³

et al. 2011

AIChE Journal

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A simplified analytical solution for the flow of power-law liquids through a conical annulus was derived to estimate the flow profile, wall shear rate, and elongation rate in the spinneret during the spinning of hollow fiber membranes. The velocity profiles and shear and elongation rates of the power-law fluid showed good agreement with those obtained from computational fluid dynamic simulations. Although the actual spinneret is characterized by an annulus with a converging cross section, most studies to date have used a geometrical concentric annulus for the sake of simplicity. The results of the current work indicate that neglecting the converging characteristics of the actual spinneret can lead to significant underestimation of the wall shear rate. Using the equations derived in our work, we were able to predict not only the velocity profile but also the wall shear rate and the elongation rate; the influence of the spinneret design on the membrane morphology and properties were also examined.

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“…Tasselli found that the optimal velocity value was in that range. In addition, other authors as Marcos et al [28] and Chung et al [29], worked at a CFV of 1 m/s with soy proteins and dextrans, respectively.…”

Section: Fouling Uf Testsmentioning

confidence: 99%

Comparison of different model solutions to simulate membrane fouling in the ultrafiltration of a secondary effluent from a municipal wastewater treatment plant

Torà-Grau

Soler–Cabezas

Vincent‐Vela

et al. 2014

Desalination and Water Treatment

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The quality of the secondary treatment effluent from a Municipal Wastewater Treatment Plant is not good enough for some applications such as agriculture. Membrane ultrafiltration has been proven to be a reliable tertiary treatment to achieve the needed water quality. The productivity of the ultrafiltration processes depends on the membrane fouling. The aim of this work is to prepare a model wastewater that could mimic the fouling trend of a secondary treatment effluent wastewater from a Municipal Wastewater Treatment Plant. Several model wastewaters consisting of different proteins and carbohydrates were used in the ultrafiltration experiments. Ultrafiltration was also performed with a secondary treatment effluent. The membrane used in the ultrafiltration tests was a UFCM5 from Norit X-flow® hydrophilic polyethersulfone/polyvinylpyrrolidone blend hollow fiber ultrafiltration membrane of 200 KDa molecular weight cut-off with a fiber diameter of 1.5 mm. Membrane configuration was insideout. Ultrafiltration tests with model wastewater and secondary treatment effluent wastewater were compared. The results showed that the best model wastewater which represents the fouling trend of secondary treatment effluent wastewater is the model wastewater whose composition is 15 mg/l of bovine serum albumin and 5.5 mg/l of dextran.

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Effect of shear rate within the spinneret on morphology, separation performance and mechanical properties of ultrafiltration polyethersulfone hollow fiber membranes

Cited by 139 publications

References 24 publications

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Preparation of hydrophobic PVDF hollow fiber membranes for desalination through membrane distillation

Power‐law polymer solution flow in a converging annular spinneret: Analytical approximation and numerical computation

Comparison of different model solutions to simulate membrane fouling in the ultrafiltration of a secondary effluent from a municipal wastewater treatment plant

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