Influence of Spacer Design and Module Geometry on the Filtration Performance during Skim Milk Microfiltration with Flat Sheet and Spiral-Wound Membranes

Membranes

卷:10

Franziska Kurz¹  Martin Hartinger¹  Eva-Maria Schmid¹  Dominik Hoffmann¹  Jonas Napiwotzki¹  Ulrich Kulozik¹ 

[1] Chair of Food and Bioprocess Engineering, Technical University of Munich, 85354 Freising, Germany;

关键词: skim milk;    swm;    parallel spacer;    module architecture;    deposit layer control;    flat sheet test cell;   

DOI  :  10.3390/membranes10040057

来源: DOAJ

【 摘 要 】

Spacer design in spiral-wound membranes (SWMs) significantly affects the axial pressure
drop in the flow channel but also the deposit layer removal. However, the effects of the spacer
design and feed flow distribution in the module on the filtration performance have not yet been
investigated during the highly fouling-susceptible fractionation of proteins from skim milk by
SWMs. Therefore, a parallel spacer with no turbulence promotion and a less homogeneous feed
flow distribution in the SWM was compared to a diamond spacer with regard to its impact on
deposit formation and filtration performance. The experiments were conducted in a flat sheet test
cell and in SWMs. The parallel spacer induced a more homogeneous deposit layer formation.
However, no difference in filtration performance could be observed in the experiments with the test
cell. Even though deposit layer formation dominates the microfiltration, its amount and spatial
distribution could not be directly linked to the filtration performance. Furthermore, both spacers
were assessed in SWM. Despite the higher crossflow velocity applicable in the more open channels
of the parallel spacer, the performance of the parallel spacer was inferior to the diamond spacer.
This was independent of the viscosity of the feed. Due to the high curvature of the membrane sheets
close to the permeate collection tube, the cross-section of the flow channels in the SWM equipped
with the parallel spacer was reduced. This resulted in a distinctly lower deposit layer control and
performance, which could not be compensated by the resulting higher crossflow velocity far from
the permeate collection tube.

【 授权许可】

Unknown