In situ MRI of alginate fouling and flow in ceramic hollow fiber membranes

Arndt, F.; Schuhmann, Sebastian; Guthausen, Gisela; Schütz, Steffen; Nirschl, Hermann

doi:10.1016/j.memsci.2016.11.079

Cited by 29 publications

(30 citation statements)

References 28 publications

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“…The experiments were performed in dead‐end filtration mode. A complete description of the filtration setup and its configuration options can be found in previous studies …”

Section: Methodsmentioning

confidence: 99%

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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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“…The experiments were performed in dead‐end filtration mode. A complete description of the filtration setup and its configuration options can be found in previous studies …”

Section: Methodsmentioning

confidence: 99%

“…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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“…A fast spin echo method is needed for in situ filtration in CHFMs because of the inherent T 2 contrast which is generated by the contrast agent but also because of large susceptibility differences between liquids and ceramics. 19 A RARE pulse sequence was used to measure the deposit formation in the membrane lumen while exploring the possibilities of CS. A series of 1808 pulses after a 908 excitation pulse generates a series of echoes with different phase encodings but also with different transverse relaxation weighting.…”

Section: Mri Methodsmentioning

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%

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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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Magnetic Resonance Imaging of Membrane Filtration Processes

Wypysek¹,

Weßling²

2022

Magnetic Resonance Microscopy

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In situ MRI of alginate fouling and flow in ceramic hollow fiber membranes

Cited by 29 publications

References 28 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

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

Magnetic Resonance Imaging of Membrane Filtration Processes

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