In-situ visualization of flow and fouling layer formation in ceramic hollow fiber membranes by magnetic resonance tomography (MRI)

F. Arndt*, S. Schuhmann, G. Guthausen, H. Nirschl, Karlsruhe Institute of Technology (KIT); S. Sch├╝tz, MANN+HUMMEL GmbH, Germany

Within membrane processes, fouling is one of the critical issues affecting the productivity, plant operation and maintenance costs. Focusing on wastewater treatment processes, it has been reported that extracellular polymeric substances (EPS) are one of the main causes of membrane fouling. In membrane filtration research, sodium alginate often serves as a model compound for EPS. Sodium alginate is a hydrophilic unbranched binary copolymer. In the presence of divalent cations, e.g. Ca2+, alginates form complexes, which lead to a significant change in filtration mechanisms in dead-end filtration and also to a change in filtration performance during cross-flow filtration experiments. Filtration conditions (e.g. transmembrane pressure or cross flow velocity), feed composition as well as membrane material have a major influence on the fouling behavior of the system. In this study ceramic hollow fiber membranes were used due to their high chemical and thermal stability coupled with a high specific membrane surface.
In addition to the evaluation of the filtration data using conventional cake filtration model, nuclear magnetic resonance imaging was used to elucidate the influence of Ca2+ on the fouling layer structure for alginate filtration with ceramic hollow fibre membranes....

Session: M5 - Fouling and Ceramic Membranes
Day: 12 October 2016
Time: 16:45 - 18:00 h

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