Filtration of lager beer with microsieves: flux, permeate, haze and in-line microscope observations

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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.
Item Type:Article
Copyright:© 2002 Elsevier Science B.V.
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/42339
Official URL:http://dx.doi.org/10.1016/S0376-7388(01)00553-1
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