Intensification of microfiltration using a blade-type turbulence promoter

Popović, Sanja; Jovičević, Dragica Z.; Muhadinović, Marko; Milanović, Spasenija D.; Tekić, Miodrag N.

doi:10.1016/j.memsci.2012.09.032

Cited by 28 publications

(19 citation statements)

References 27 publications

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“…However, membrane fouling during the process is one of the major disadvantages of this technology (4). Different techniques might be employed to reduce the membrane fouling: increase of crossflow velocity (5), promotion of turbulence (6,7,8,9,10), pulsation, backflushing (11), temperature increase (12), changes in pH (13), flocculation (14,15), and coagulation (16) of the suspension, introduction of external electrical field (17,18), and surface modification with temperature sensitive polymers (19). Membrane fouling becomes even more critical in crossflow microfiltration of disrupted cells as there are solids and solutes of various sizes, hydrophobicities, charge densities, solubilities, shapes, sensitivities to share force, etc.…”

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confidence: 99%

Optimization of Crossflow Microfiltration of DisruptedArthrobacter luteusCells

Mažeika

Rušinas

Stupak

et al. 2015

Separation Science and Technology

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Influence of various conditions on crossflow microfiltration of disrupted Arthrobacter luteus cells has been analyzed. Evaluation of permeate flux and transmission of macromolecules through the membrane demonstrates that the 750 kDa MWCO polysulfone membrane is the most efficient. Ionic strength, cell concentration, and pH have the highest influence on the yield of AluI restriction endonuclease. Meanwhile, the flocculation and decreased pH have the largest effect on performance of crossflow microfiltration. Flocculation with polyethyleneimine (PEI) have increased the permeate flux to 45.7 Lh −1 m −2 and pH5.5 decreased the flux to 22.2 Lh −1 m −2 . In conclusion, optimal conditions for crossflow microfiltration of A. luteus cells lysate have been identified.

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confidence: 99%

Optimization of Crossflow Microfiltration of DisruptedArthrobacter luteusCells

Mažeika

Rušinas

Stupak

et al. 2015

Separation Science and Technology

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“…The effect of turbulence promoter's geometry on the flow field in the membrane channel and fouling minimization have been widely presented. [4][5][6] Turbulence promoters of diverse geometries are studied in the microfiltration of various mixtures such as yeast, 7,8 skimmed milk, 4,6 bentonite, 9 etc. where excellent flux improvements were gained.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of ultrafiltration of milk proteins by applying twisted tapes: A sensitivity analysis using a response surface methodology

Popović

Ilicic

Gáspár

2020

JSCS

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This paper presents the intensification of the ultrafiltration of milk proteins by applying twisted tapes as turbulence promoters to minimize membrane fouling. The aim was to examine the influence of operating conditions and twisted tape dimension on the alleviation of flux and the consumption of specific energy. A twisted tape was inserted in the ultrafiltration membrane (50 nm pore size) to alleviate turbulence and minimize fouling. The response surface methodology was used for the sensitivity analysis of the effects of operating conditions on the responses. The analysis showed that the linear effect of the aspect ratio of a twisted tape has a dominant significant effect on flux improvement. The linear effect of cross-flow rate has a positive dominant effect on the specific energy consumption. The linear effect of concentration and the mutual effect of aspect ratio and transmembrane pressure are statistically significant for both responses. By adjusting the operating conditions properly, the high flux improvement of 300 % can be reached with specific energy consumption below 1.0 kWh m-3 using a twisted tape of the aspect ratio of 1.0 and imposing low transmembrane pressure.

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“…In addition, higher cross-flow velocities increase the wall shear rate at the membrane surface [12]. To further enlarge the benefit of inserts in the flow channel, their geometry is designed to induce secondary flows which enhance mixing and particle back transport into the bulk fluid [4,19]. For instance, wires are wound around a rod to establish a helical flow path forming vortices and flow instabilities [7,20].…”

Section: Introductionmentioning

confidence: 99%

“…This was explained by the change in flow path induced by the varying cross-section of the cone-shaped insert [25]. 6 kW h/m 3 , whereas less than 4.4 kW h/m 3 were necessary in the system with blade-type mixers [19]. However, the specific energy consumption was even lower when twisted tape mixers were applied instead of blade-type mixers [19].…”

Section: Introductionmentioning

confidence: 99%

“…6 kW h/m 3 , whereas less than 4.4 kW h/m 3 were necessary in the system with blade-type mixers [19]. However, the specific energy consumption was even lower when twisted tape mixers were applied instead of blade-type mixers [19]. The lower energy-efficiency of the blade-type mixers in comparison to the twisted tape mixers was attributed to the higher pressure loss the blade-type mixers impose on the filtration system [19].…”

Section: Introductionmentioning

confidence: 99%

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Fouling Mitigation in Tubular Membranes by 3D-printed Twisted Tape Turbulence Promoters

Weßling¹

2019

Preprint

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Despite intensive research, fouling remains a severe problem in membrane filtration. It is often controlled by applying turbulent flow which requires a higher energy consumption. So-called turbulence promoters or static mixers can be inserted into the flow channel of tubular membranes. They deflect the fluid, induce vortices, enhance particle back-transport and increase the shear rate at the membrane surface, thus mitigating fouling. However, little is known how the geometry of such turbulence promotors affects the reduction of fouling. We investigate how different 3D-printed mixer geometries affect fouling and improve the flux during filtration with humic acid. Most mixer geometries used in the present study are based on a twisted tape; a Kenics static mixer is investigated as well. Static mixers with changing diameter prove to be less effective than twisted tape mixers with constant diameter which lead to an increase in permeate flux of around 130%. The highest flux improvement of 140% can be reached by applying a Kenics mixer. Regardless of their geometry, all investigated static mixer cause higher permeate fluxes at same specific energy consumption. Again, the Kenics mixer proves to be the most efficient static mixer. The presented mixer geometries can be fabricated with undercut injection molding techniques and represent a simple and viable option to make tubular membrane based filtration processes more efficient.

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Intensification of microfiltration using a blade-type turbulence promoter

Cited by 28 publications

References 27 publications

Optimization of Crossflow Microfiltration of DisruptedArthrobacter luteusCells

Optimization of Crossflow Microfiltration of DisruptedArthrobacter luteusCells

Enhancement of ultrafiltration of milk proteins by applying twisted tapes: A sensitivity analysis using a response surface methodology

Fouling Mitigation in Tubular Membranes by 3D-printed Twisted Tape Turbulence Promoters

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