Crossflow microfiltration with polymeric flat sheet membrane and hollow fibre membrane in the dairy industry
Translated title
Crossflow microfiltrering med polymriske flat sheet membraner of hollow fibre membrane i mejeri industrien
Author
Sørensen, Lone
Term
4. Term
Education
Publication year
2021
Submitted on
2021-06-02
Abstract
Denne afhandling undersøger krydsstrøms-mikrofiltrering med polymeriske flat sheet- og hulfiber-membraner i mejeriindustrien. Formålet var at kortlægge flux- og permeabilitetstendenser, tilbageholdelse af fedt, protein, laktose og tørstof samt fouling under varierende driftsbetingelser, herunder tryk, strømningshastighed og fedtindhold i føden. Der blev udført filtreringsforsøg, og permeatsammensætningen blev vurderet med en kvalitativ FT-IR metode for at observere tendenser. Arbejdet konkluderer, at membranernes hydrofobicitet påvirker fouling, hvilket igen påvirker flux og tilbageholdelse, og at materialevalg og membrantykkelse også har betydning for filtreringsydelsen. Resultaterne giver praktisk indsigt i valg af membrankonfiguration (flat sheet versus hulfiber) og driftsparametre ved mikrofiltrering af mælk, inklusive undersøgelse af MF som muligt alternativ til centrifugering for fjernelse af fedtkugler.
This thesis investigates crossflow microfiltration using polymeric flat sheet and hollow fibre membranes in the dairy industry. The aim was to map flux and permeability trends, rejection of fat, protein, lactose, and total solids, and fouling under varying operating conditions, including pressure, feed velocity, and feed fat content. Filtration experiments were conducted, and permeate composition was assessed with a qualitative FT-IR method to observe trends. The work concludes that membrane hydrophobicity influences fouling, which in turn affects flux and rejection, and that membrane material and thickness also impact filtration performance. The findings provide practical insight into selecting membrane configurations (flat sheet versus hollow fibre) and operating parameters for milk microfiltration, including investigation of MF as a potential alternative to centrifugation for removing fat globules.
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