Influence of operating parameters and membrane materials on fouling of ceramic hollow fibre membranes

Arndt, F.; Ehlen, Frank; Schütz, Steffen; Anlauf, Harald; Nirschl, Hermann

doi:10.1016/j.seppur.2016.07.046

Cited by 15 publications

(5 citation statements)

References 22 publications

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“…MRI was used for an in situ analysis of many membrane processes . MRI allows not only a measurement in an optically transparent setup but is also a non‐invasive analysis method in opaque ceramic hollow fibers that are used in this publication …”

Section: Introductionmentioning

confidence: 99%

In situ measurement of deposit layer formation during skim milk filtration by MRI

Schork

Schuhmann

Nirschl

et al. 2019

Magnetic Reson in Chemistry

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Filtration and separation via membranes are key processes in food processing. One major application of membrane filtration is in the dairy industry, aiming for the separation of different milk proteins. The various chemical components of milk possess different physiochemical properties and can be used most effectively in food processing if they are separately available and remain in their native state. Microfiltration of skim milk allows a fractionation of the milk proteins casein and whey by size. A deposit is formed on the membrane surface mainly but not exclusively by micellar casein proteins during filtration. Membrane pore blockage by whey proteins and fouling occur during membrane filtration, negatively affecting the yield of the whey protein fraction. Skim milk filtration and the deposit layer formation were measured time and spatially resolved by in situ magnetic resonance imaging (MRI). The nature of the fouling layer was investigated during dead‐end filtration in ceramic hollow fiber membranes. MRI was used to further clarify the influence of operating conditions on separation and filtration mechanisms that are responsible for growth of the fouling layer and its reversibility. The MRI measurements were analyzed for a detailed description of skim milk filtration by modeling the signal intensity distribution.

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Section: Introductionmentioning

confidence: 99%

In situ measurement of deposit layer formation during skim milk filtration by MRI

Schork

Schuhmann

Nirschl

et al. 2019

Magnetic Reson in Chemistry

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“…Für die Filtra tion heißt das, dass sich im Fall puren Alginats in wässriger Lösung eine Konzentrationspolarisation, d. h. ein Konzentrationsgradient, während der Fil tration ausbildet, wohingegen bei der Filtration von wässriger Natrium-Alginatlösung mit zweiwertigen ionen eine Gelschicht an der innenseite der membran entsteht. Die Unterschiede der Filtrationsmechanismen finden sich in den mRi-messungen wieder und werden in der quantitativen Auswertung der intensitätsprofile offensichtlich [28,30,31,37].…”

Section: Mri-charakterisierung Von Ultrafiltrationen Als Beispiel Für Mechanische Trennverfahrenunclassified

NMR‐Messmethoden

Schuhmann¹,

Guthausen²

2020

Chemie in nserer Zeit

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Zusammenfassung Durch die vielseitigen Einsatzmöglichkeiten der zerstörungsfreien und nichtinvasiven NMR‐Messmethodik können zahlreiche verfahrenstechnische Prozesse wie Kristallisation, Alterung, Separation oder chemische Reaktion hinsichtlich Molekülstruktur, Moleküldynamik, Diffusion, und mesoskopischer Struktur detailliert charakterisiert werden. Dabei wird beispielsweise die NMR‐Spektroskopie zur quantitativen Messung chemischer Reaktionen verwendet. Die NMR‐Bildgebung ist als Magnetresonanztomographie in der Medizin bekannt. Mit ihr kann in der Verfahrenstechnik beispielsweise das Zusetzen von Membranfiltern bei verschiedenen Betriebsbedingungen charakterisiert werden. Auch zur Bestimmung von Produkteigenschaft und Produktqualität werden NMR‐Methoden im industriellen Maßstab verwendet, um zum Beispiel Verfälschungen in Lebensmitteln aufzudecken oder den Öl‐ bzw. Fettgehalt zu bestimmen.

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“…Most of the feed volume is pumped back into the reservoir as retentate and only a small fraction flows through the membrane as filtrate. Porous hollow fibres are often used due to their large internal surface-to-volume ratio [1], [2], but the pumped fluid is subject to high drag within the small cross sections of the fibres. In addition to the transmembrane pressure (TMP) required to force the filtrate through the membrane, additional pressure is needed for the tangential flow, resulting in high pumping costs per volume of filtrate.…”

Section: Introductionmentioning

confidence: 99%

Concept and Design of a Bearingless Spinfilter

Beglinger¹,

Steinert²,

Nußbaumer³

et al. 2023

IEEE/ASME Trans. Mechatron.

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In many separation processes, filtration performance degrades over time due to retained particles blocking the flow through the filter membrane. A novel bearingless spinfilter extends the long-term performance by self-cleaning effects. The filter rotor is magnetically levitated and actuated by two selfbearing motors inside a hermetically sealed housing, which eliminates the need for bearings and rotary sealings, that both lead to process fluid contamination. Both bearingless motors have integrated electronics and independently control the levitation of the spinfilter rotor. A first prototype is designed and the concept is validated by the separation of a yeast cell culture. Special focus is placed on the internal rotary seal between the feed and filtrate regions, that is inevitably created when the filter membrane is in motion. Any leakage flow through the seal leads to filtrate impurities, which is minimized in this paper with an embedded impeller as a pressure compensation method. A constant filtrate flux of 1750 L h −1 m −2 and a filtrate purity of 75 % was achieved in a first series of tests.

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Influence of operating parameters and membrane materials on fouling of ceramic hollow fibre membranes

Cited by 15 publications

References 22 publications

In situ measurement of deposit layer formation during skim milk filtration by MRI

In situ measurement of deposit layer formation during skim milk filtration by MRI

NMR‐Messmethoden

Concept and Design of a Bearingless Spinfilter

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