Filtration of lager beer with microsieves: flux, permeate, haze and in-line microscope observations
Kuiper, Stein and Rijn van, Cees and Nijdam, Wietze and Raspe, Onno and Wolferen van, Henk and Krijnen, Gijs and Elwenspoek, Miko (2002) Filtration of lager beer with microsieves: flux, permeate, haze and in-line microscope observations. Journal of Membrane Science, 196 (2). pp. 159-170. ISSN 0376-7388
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|Abstract:||Membrane fouling during filtration of lager beer with microsieves was studied through in-line microscope observations. It was observed that the main fouling was caused by micrometre-sized particles, presumably aggregated proteins. These particles formed flocks covering parts of the membrane surface. Most of the flocks could be removed by a strong temporary increase in crossflow. Underneath the flocks a permanent fouling layer was formed inside the pores. This made frequent removal of the flocks crucial in delaying the process of permanent in-pore fouling.
Besides the fouling process the influence of pore size on permeate flux and turbidity was investigated. Centrifuged beer appeared to give a significantly clearer permeate than rough beer. For centrifuged beer and a microsieve with a pore diameter of 0.55 μm a haze of 0.23 EBC was obtained during 10.5 h of filtration at an average flux of 2.21×103 l/m2 h. For a sieve with slit-shaped perforations of 0.70 μm×3.0 μm a haze of 0.46 EBC was obtained during 9 h of filtration at an average flux of 1.43×104 l/m2 h. This flux is more than two-orders of magnitude higher than is commonly obtained with membrane-filtration of lager beer. Concentration of the beer by a factor of 12 hardly influenced the magnitude of the flux.
|Copyright:||© 2002 Elsevier Science B.V.|
Electrical Engineering, Mathematics and Computer Science (EEMCS)
|Link to this item:||http://purl.utwente.nl/publications/42339|
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