Omniphobic Hollow Fiber Membranes for Water Recovery and Desalination

2020 ◽  
Vol 2 (8) ◽  
pp. 3034-3038 ◽  
Author(s):  
Mahdi Mohammadi Ghaleni ◽  
Abdullah Al Balushi ◽  
Mona Bavarian ◽  
Siamak Nejati
Keyword(s):  
Hollow Fiber ◽  
Water Recovery ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

Development of polyethersulfone and polyacrylonitrile hollow fiber membranes for clarification of surface water and fungal enzyme broth

2013 ◽  
Vol 13 (1) ◽  
pp. 44-55 ◽  
Author(s):  
K. Praneeth ◽  
S. Kalyani ◽  
Y. V. L. Ravikumar ◽  
J. Tardio ◽  
S. Sridhar
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Hollow Fiber ◽  
Hydraulic Pressure ◽  
Water Recovery ◽  
Hollow Fiber Membranes ◽  
Log Reduction ◽  
Surface Water Treatment ◽  
Fungal Enzyme ◽  
Fiber Membranes

Hollow fiber membranes are of great commercial interest with several applications at the forefront of research to carryout bioseparations, drinking water purification, wastewater treatment besides liquid phase separations and gaseous separations. An experimental study was carried out to synthesize hollow fiber membranes from polyethersulfone (PES) and polyacrylonitrile (PAN) polymers to fabricate modules for surface water treatment and clarification of fungal enzyme broth. Design drawings of a manual hollow fiber spinning machine and spinneret were prepared to fabricate the necessary equipment for extrusion of hollow fibers. Effect of various spinning conditions on specific macroscopic fiber properties, such as outer diameter and wall thickness and membrane pore structure was studied. Concentrations of 15–20 wt% PES in n-methylpyrrolidone (NMP) and PAN in dimethyl formamide (DMF) solvents with important additives and pore formers were prepared. These polymer solutions were extruded through the spinneret and subjected to phase inversion in a water bath. The membranes were characterized by scanning electron microscopy (SEM) and pure water flux studies. PAN and PES exhibited 99.8 and 95.4% turbidity rejection. PAN exhibited a 5 log reduction of Escherichia coli bacteria for surface water treatment at a low hydraulic pressure of 1 bar with a flux of 54.2 L/m2 h at a water recovery of 80% whereas PES gave a flux of 36.6 L/m2 h with 4 log reduction of E. coli. PAN and PES membranes exhibited 54.9 and 69.3% xylanase enzyme recoveries from fungal broth at reasonable flux with turbidity rejection of 94.8 and 95.7% respectively.

Dual Layer Mixed Matrix Hollow Fiber Membranes for Outside-In Filtration of Human Blood Plasma

2020 ◽  
Author(s):  
O.E.M. ter Beek ◽  
M.K. van Gelder ◽  
C. Lokhorst ◽  
D.H.M. Hazenbrink ◽  
B.H. Lentferink ◽  
...  
Keyword(s):  
Blood Plasma ◽  
Human Blood ◽  
Hollow Fiber ◽  
Human Blood Plasma ◽  
Hollow Fiber Membranes ◽  
Mixed Matrix ◽  
Fiber Membranes

Inner-selective coordination nanofiltration hollow fiber membranes from assist-pressure modified substrate

2021 ◽  
Vol 626 ◽  
pp. 119186
Author(s):  
Qian Wang ◽  
Xin Wei ◽  
Guang-Rui Wang ◽  
Tian-Dan Lu ◽  
Qixun Shi ◽  
...  
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

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.

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