Advances in the use of low-pressure, hollow fiber membranes for the disinfection of water

2005 ◽  
Vol 5 (5) ◽  
pp. 109-115 ◽  
Author(s):  
J.G. Jacangelo ◽  
A. Madec ◽  
K.J. Schwab ◽  
D.E. Huffman ◽  
C.S. Mysore
Keyword(s):  
Molecular Weight ◽  
Pore Size ◽  
Hollow Fiber ◽  
Good Predictor ◽  
Low Pressure ◽  
Hollow Fiber Membranes ◽  
Virus Removal ◽  
Testing Unit ◽  
Bench Scale ◽  
Molecular Weight Cutoff

Low-pressure membranes are often used for disinfection purposes. Using a simple bench-scale testing unit, several membranes were evaluated for their capability to remove microorganisms under specific conditions. Five hollow fiber modified polysulfone membranes ranging in molecular weight cutoff (MWCO) from 10,000 to 300,000 daltons and a 0.2 μm nominal pore size membrane were also evaluated. The 10,000 MWCO membrane removed less virus than the two 100,000 MWCO or the 300,000 MWCO membranes. The data from this study suggests that MWCO and specific flux may not, in all cases, be a good predictor of virus removal.

scholarly journals Hydrophilic Dual Layer Hollow Fiber Membranes for Ultrafiltration

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 143
Author(s):  
Lara Grünig ◽  
Ulrich A. Handge ◽  
Joachim Koll ◽  
Oliver Gronwald ◽  
Martin Weber ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hollow Fiber ◽  
Triblock Copolymer ◽  
Pure Water ◽  
Vinyl Pyrrolidone ◽  
Scattering Data ◽  
Coupling Mechanism ◽  
Additive Concentration ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

In this study, a triblock copolymer was used as additive to fabricate new dual layer hollow fiber membranes with a hydrophilic active inner surface in order to improve their fouling resistance. The polymeric components of the solutions for membrane fabrication were poly(ether sulfone), poly(N-vinyl pyrrolidone), and the triblock copolymer. The additive consists of three blocks: a middle hydrophobic poly(ether sulfone) block and two outer hydrophilic alkyl poly(ethylene glycol) blocks. By varying the additive concentration in the solutions, it was possible to fabricate dual layer hollow fiber membranes that are characterized by a hydrophilic inner layer, a pure water permeance of over 1800 L/(m2 bar h) and a molecular weight cut-off of 100 kDa similar to commercial membranes. Contact angle and composition determination by XPS measurements revealed the hydrophilic character of the membranes, which improved with increasing additive concentration. Rheological, dynamic light scattering, transmission, and cloud point experiments elucidated the molecular interaction, precipitation, and spinning behavior of the solutions. The low-molecular weight additive reduces the solution viscosity and thus the average relaxation time. On the contrary, slow processes appear with increasing additive concentration in the scattering data. Furthermore, phase separation occurred at a lower non-solvent concentration and the precipitation time increased with increasing additive content. These effects revealed a coupling mechanism of the triblock copolymer with poly(N-vinyl pyrrolidone) in solution. The chosen process parameters as well as the additive solutions provide an easy and inexpensive way to create an antifouling protection layer in situ with established recipes of poly(ether sulfone) hollow fiber membranes. Therefore, the membranes are promising candidates for fast integration in the membrane industry.

Tailoring the surface pore size of hollow fiber membranes in the TIPS process

2018 ◽  
Vol 6 (2) ◽  
pp. 535-547 ◽  
Author(s):  
Chuanjie Fang ◽  
Sungil Jeon ◽  
Saeid Rajabzadeh ◽  
Liang Cheng ◽  
Lifeng Fang ◽  
...  
Keyword(s):  
Pore Size ◽  
Hollow Fiber ◽  
Outer Layer ◽  
New Method ◽  
Hollow Fiber Membranes ◽  
Polymeric Solution ◽  
Fiber Membranes

A new method was used to tailor the surface pore size of PVDF hollow fiber membranes in the TIPS process by the co-extrusion of different solvents at the outer layer of the extruded polymeric solution.

Concentration and purification of rubella virus hemagglutinin by hollow fiber ultrafiltration and sucrose density centrifugation

1980 ◽  
Vol 26 (11) ◽  
pp. 1334-1339 ◽  
Author(s):  
M. Trudel ◽  
P. Payment
Keyword(s):  
Molecular Weight ◽  
Tissue Culture ◽  
Vero Cell ◽  
Hollow Fiber ◽  
Rubella Virus ◽  
Specific Activity ◽  
Sucrose Density Gradient ◽  
Hollow Fibers ◽  
Cell Monolayers ◽  
Molecular Weight Cutoff

Large volumes of rubella virus were produced in Vero cell monolayers which were grown in the Corbeil-Bellco TM system. Infectious tissue culture fluids were concentrated at least 600 times in less than 4 h by ultrafiltration on hollow fibers with a molecular weight cutoff of 100 000. Recovery of the hemagglutinating activity was 75%. Rubella virus was purified by three successive sucrose density gradient centrifugations using a combination of discontinuous and linear gradients. Specific activity was increased 1000-fold.

PVDF hollow fiber membranes prepared from green diluent via thermally induced phase separation: Effect of PVDF molecular weight

2014 ◽  
Vol 471 ◽  
pp. 237-246 ◽  
Author(s):  
Naser Tavajohi Hassankiadeh ◽  
Zhaoliang Cui ◽  
Ji Hoon Kim ◽  
Dong Won Shin ◽  
Aldo Sanguineti ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Separation ◽  
Hollow Fiber ◽  
Thermally Induced Phase Separation ◽  
Hollow Fiber Membranes ◽  
Separation Effect ◽  
Thermally Induced ◽  
Fiber Membranes

Fouling mechanism of low-pressure hollow fiber membranes used in separating nanosized photocatalysts

2012 ◽  
Vol 389 ◽  
pp. 532-543 ◽  
Author(s):  
Guoliang Zhang ◽  
Jiwei Zhang ◽  
Ling Wang ◽  
Qin Meng ◽  
Jinhui Wang
Keyword(s):  
Hollow Fiber ◽  
Low Pressure ◽  
Hollow Fiber Membranes ◽  
Fouling Mechanism ◽  
Fiber Membranes
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