Deposit layer formation during skim milk dead-end filtration with ceramic hollow fiber membranes using magnetic resonance imaging

Arndt, F.; Heidebrecht, Hans-Jürgen; Schork, Nicolas; Schuhmann, Sebastian; Kulozik, Ulrich; Schütz, Steffen; Nirschl, Hermann; Guthausen, Gisela

doi:10.1255/mrfs.11

Cited by 4 publications

(10 citation statements)

References 13 publications

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“…3 to the data is numerically suffi ciently stable to compensate for this imperfection. As a result, h(t) obviously depends on the filtration time ( Figure 5b) and is much larger than in the case of alginate filtration without Ca 21 . When fitting Eq.…”

Section: Resultsmentioning

confidence: 87%

“…The concentration of sodium alginate was 200 mg/L. Sodium alginate is known to form gel structures in the presence of divalent ions like Ca 21 . In former experi ments, loose polarization layers or gel layers could be observed.…”

Section: Feed Solutions With Contrast Agentsmentioning

confidence: 99%

“…In former experi ments, loose polarization layers or gel layers could be observed. [19][20][21] Ca 21 ions were added in form of CaCl 2 (Sigma Aldrich) with a concentration of c Ca 21 2mmol/L. Due to the poor contrast between alginate and water a contrast agent (Magnetite Alginate 100 MagAlg100, also named MION) 22 was added to the feed solution in concentrations of 1 mM and below.…”

Section: Feed Solutions With Contrast Agentsmentioning

confidence: 99%

“…The filtration module was investigated using a Bruker Avance HDIII SWB 200 MHz spectrometer equipped for MRI. [19][20][21] The probe was a 20 mm birdcage of the MICWB40 series. This allows for an in situ observation of the membrane lumen during the filtration.…”

Section: In Situ Filtration Experimentsmentioning

confidence: 99%

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In‐situcharacterization of deposits in ceramic hollow fiber membranes by compressed sensing RARE‐MRI

et al. 2018

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Ultrafiltration with ceramic hollow fiber membranes was investigated by compressed sensing rapid acquisition relaxation enhancement (CS-RARE) magnetic resonance imaging (MRI) to characterize filtration mechanisms. Sodium alginate was used as a model substance for extracellular polymeric substances. Dependent on the concentration of divalent ions like Ca 21 in an aqueous alginate solution, the characteristics of the filtration change from concentration polarization to a gel layer. The fouling inside the membrane lumen could be measured by MRI with a CS-RARE pulse sequence. Contrast agents have been used to get an appropriate contrast between deposit and feed. The lumen was analyzed quantitatively by exploring the membrane's radial symmetry, and the resulting intensity could be modeled. Thus, different fouling mechanisms could be distinguished. CS-RARE-MRI was proven to be an appropriate in situ tool to quantitatively characterize the deposit formation during in-out filtration processes. The results were underlined by flux interruption experiments and length dependent studies, which make it possible to differentiate between gel layer or cake filtration and concentration polarization filtration processes.

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Section: Resultsmentioning

confidence: 87%

Section: Feed Solutions With Contrast Agentsmentioning

confidence: 99%

Section: Feed Solutions With Contrast Agentsmentioning

confidence: 99%

Section: In Situ Filtration Experimentsmentioning

confidence: 99%

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In‐situcharacterization of deposits in ceramic hollow fiber membranes by compressed sensing RARE‐MRI

et al. 2018

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“…In previous studies [21][22][23][24][25][26], nuclear magnetic resonance imaging (MRI) was used as a non-invasive and non-destructive technique to assess the growth of a deposit layer during filtration of diverse materials as a function of filtration time. These works mostly studied model systems consisting of inorganic particles or defined hydrocolloids such as alginate in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Structural Characterisation of Deposit Layer during Milk Protein Microfiltration by Means of In-Situ MRI and Compositional Analysis

et al. 2020

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Milk protein fractionation by microfiltration membranes is an established but still growing field in dairy technology. Even under cross-flow conditions, this filtration process is impaired by the formation of a deposit by the retained protein fraction, mainly casein micelles. Due to deposition formation and consequently increased overall filtration resistance, the mass flow of the smaller whey protein fraction declines within the first few minutes of filtration. Currently, there are only a handful of analytical techniques available for the direct observation of deposit formation with opaque feed media and membranes. Here, we report on the ongoing development of a non-invasive and non-destructive method based on magnetic resonance imaging (MRI), and its application to characterise deposit layer formation during milk protein fractionation in ceramic hollow fibre membranes as a function of filtration pressure and temperature, temporally and spatially resolved. In addition, the chemical composition of the deposit was analysed by reversed phase high pressure liquid chromatography (RP-HPLC). We correlate the structural information gained by in-situ MRI with the protein amount and composition of the deposit layer obtained by RP-HPLC. We show that the combination of in-situ MRI and chemical analysis by RP-HPLC has the potential to allow for a better scientific understanding of the pressure and temperature dependence of deposit layer formation.

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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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Deposit layer formation during skim milk dead-end filtration with ceramic hollow fiber membranes using magnetic resonance imaging

Abstract: A dead-end filtration process of skim milk with ceramic hollow fiber membranes was investigated using in situ Magnetic Resonance Imaging. Special emphasis was put on contrast optimization exploiting water relaxation times being sensitive to casein concentration in the formed deposit layer.

Cited by 4 publications

References 13 publications

In‐situcharacterization of deposits in ceramic hollow fiber membranes by compressed sensing RARE‐MRI

In‐situcharacterization of deposits in ceramic hollow fiber membranes by compressed sensing RARE‐MRI

Structural Characterisation of Deposit Layer during Milk Protein Microfiltration by Means of In-Situ MRI and Compositional Analysis

NMR‐Messmethoden

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