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

Schuhmann, Sebastian 1; Schork, N. 1; Beller, K. 1; Nirschl, N.; Oerther, T.; Guthausen, G. 1
1 Institut für Mechanische Verfahrenstechnik und Mechanik (MVM), Karlsruher Institut für Technologie (KIT)


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 Ca21 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.

Postprint §
DOI: 10.5445/IR/1000088458
Veröffentlicht am 01.01.2020
DOI: 10.1002/aic.16201
Zitationen: 12
Web of Science
Zitationen: 14
Zitationen: 15
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 0001-1541, 1547-5905
KITopen-ID: 1000088458
Erschienen in AIChE journal
Verlag John Wiley and Sons
Band 64
Heft 11
Seiten 4039-4046
Schlagwörter fouling, alginate, NMR imaging, ceramic hollow fiber membranes, compressed sensing
Nachgewiesen in Dimensions
Web of Science
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