scholarly journals Optimizing the Axial Resistance Profile of Submerged Hollow Fiber Membranes

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 20
Author(s):  
Michael Kuhn ◽  
Heiko Briesen
Keyword(s):  
Hollow Fiber ◽  
Membrane Fouling ◽  
Optimization Method ◽  
Membrane Resistance ◽  
Practical Implementation ◽  
Hollow Fiber Membranes ◽  
General Validity ◽  
Transmembrane Flux ◽  
Fiber Membranes ◽  
First Time

Submerged hollow fiber membranes (SHFMs) are used for a wide variety of applications. Their applicability and their advantages, however, depend crucially on the prevailing hydrodynamics within single fibers. In this respect, the non-uniform distribution of transmembrane flux is a known problem related to inhomogeneous membrane fouling and disadvantages for cleaning. To address this problem, we propose an approach to homogenize transmembrane flux by varying the local membrane resistance using optimal control methods for the first time in SHFM research. Based on an established model, different scenarios are optimized, namely with different fiber lengths and inner radii. In addition, a double-end setup is explored. It is shown that the optimization goal is reached very well in all tested cases, which underlines the general validity of our strategy. Further uses and extensions of the optimization method are provided, as well as hints for the practical implementation of the suggested measures.

Performance and antifouling enhancement of polyethersulfone hollow fiber membranes incorporated with highly hydrophilic hydroxyapatite nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44480-44488 ◽  
Author(s):  
Esmaeil Salimi ◽  
Azadeh Ghaee ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Water Purification ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Hollow Fiber Membranes ◽  
Hydroxyapatite Nanoparticles ◽  
Fiber Membranes

Membrane fouling is one of the main drawbacks in water purification applications. The present work indicated that the fabricated HAp/PES hollow fiber membranes presented better hydrophilicity, permeation and anti-fouling performance compared to PES membranes.

scholarly journals The Effect of Membrane Material and Surface Pore Size on the Fouling Properties of Submerged Membranes

2016 ◽  
Author(s):  
Sungil Jeon ◽  
Saeid Rajabzadeh ◽  
Ryo Okamura ◽  
Toru Ishigami ◽  
Susumu Hasegawa ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Pore Size ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Polymeric Membrane ◽  
Transmembrane Pressure ◽  
Hollow Fiber Membranes ◽  
Membrane Material ◽  
Pore Sizes ◽  
Fiber Membranes

We aimed to investigate the relationship between membrane material and development of membrane fouling in a membrane bioreactor (MBR) using membranes with different pore sizes and hydrophilicities. Batch filtration tests were performed using submerged single hollow fiber membrane ultrafiltration (UF) modules with different polymeric membrane materials including cellulose acetate (CA), polyethersulfone (PES), and polyvinylidene fluoride (PVDF) with activated sludge taken from a municipal wastewater treatment plant. The three UF hollow fiber membranes were prepared by a non-solvent-induced phase separation method and had similar water permeabilities and pore sizes. The results revealed that transmembrane pressure (TMP) increased more sharply for the hydrophobic PVDF membrane than for the hydrophilic CA membrane in batch filtration tests, even when membranes with similar permeabilities and pore sizes were used. PVDF hollow fiber membranes with smaller pores had greater fouling propensity than those with larger pores. In contrast, CA hollow fiber membranes showed good mitigation of membrane fouling regardless of pore size. The results obtained in this study suggest that the surface hydrophilicity and pore size of UF membranes clearly affect the fouling properties in MBR operation when using activated sludge.

scholarly journals Recovery of Lignosulfonates from Spent Sulfite Liquor Using Ceramic Hollow-Fiber Membranes

Membranes ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 45 ◽  
Author(s):  
Daniel Humpert ◽  
Mehrdad Ebrahimi ◽  
Annika Stroh ◽  
Peter Czermak
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Raw Material ◽  
Hollow Fiber Membranes ◽  
Permeate Flux ◽  
Fiber Membranes ◽  
Wall Shear ◽  
Spent Sulfite Liquor

Spent sulfite liquor is an abundant but currently less used wastewater stream from the pulp and paper industry. The recovery of lignin from this resource would provide an inexpensive raw material for the manufacture of fuels and fine chemicals. Here we investigated the suitability of ceramic hollow-fiber membranes for the concentration of spent sulfite liquor as an alternative to common membrane technologies. We tested three ceramic hollow-fiber membranes (3, 8, and 30 nm) in different membrane processes (fed-batch and total recycle mode) and compared their performance with the widely-used tubular membrane geometry. We also evaluated backflushing as a strategy to reduce membrane fouling during filtration. The juxtaposition of the two membrane geometries revealed that wall shear stress is the most important process parameter for the assessment of membrane performance according to permeate flux. The higher the wall shear stress, the higher the permeate flux. Due to the smaller inner diameter of the hollow-fiber membranes, higher wall shear stress can be achieved more easily. Backflushing had no effect on the permeate flux during the concentration experiments.

Membrane fouling properties of hollow fiber membranes prepared from cellulose acetate derivatives

2011 ◽  
Vol 376 (1-2) ◽  
pp. 102-109 ◽  
Author(s):  
Takashi Shibutani ◽  
Toshihiko Kitaura ◽  
Yoshikage Ohmukai ◽  
Tatsuo Maruyama ◽  
Shuji Nakatsuka ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes

Effect of surface roughness of hollow fiber membranes with gear-shaped structure on membrane fouling by sodium alginate

2011 ◽  
Vol 366 (1-2) ◽  
pp. 389-397 ◽  
Author(s):  
Masatoshi Hashino ◽  
Takeshi Katagiri ◽  
Noboru Kubota ◽  
Yoshikage Ohmukai ◽  
Tatsuo Maruyama ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Sodium Alginate ◽  
Hollow Fiber ◽  
Membrane Fouling ◽  
Hollow Fiber Membranes ◽  
Fiber Membranes ◽  
Effect Of Surface
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