Removal of cold trub from hopped wort by crossflow microfiltration : analytical aspects

Varga, Áron and Bertok, Richárd and Hegyesné-Vecseri, Beáta and Márki, Edit: Removal of cold trub from hopped wort by crossflow microfiltration : analytical aspects. In: Proceedings of the International Symposium on Analytical and Environmental Problems, (23). pp. 70-74. (2017)

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Abstract

Removing cold trub (cold break) from hopped wort is important, because of yeast viability, beer quality and less fouling during fermentation in a Membrane Bioreactor (MBR). Cold trub can be removed from hopped wort by several methods, but Crossflow Microfiltration (CFMF) would be an alternative technology. For the membrane filtration experiment a pale wort was made in pilot scale. The membrane filtration was performed with the following operating parameters: temperature (10±1°C), Transmembrane Pressure (0.4 bar) and Retentate Flow Rate (50 l/h). The size of particles in cold trub is about 0.5 µm, the nominal pore size of the used membrane was 0.2 µm. The Initial Flux and Steady State Flux of the membrane filtration were calculated. Chemical and physical properties (β-glucan content, bitterness, colour, dynamic viscosity, extract content, free amino nitrogen content, pH, turbidity, particle size distribution) of original wort and permeate samples were measured and retentions of different components (β-glucan, iso-alpha acids, extract, free amino nitrogen) were calculated. The Initial Flux and Steady State Flux of the membrane filtration were 16.75 L/(m2 h) and 4.89 L/(m2 h), respectively. Changing of the analytical parameters are appropriate, for example, retention of β-glucan was 40.17 % and free amino nitrogen content of original wort and permeate were same. According to the particle size distribution measurement cold trub can be completely removed by CFMF. CFMF is an alternative method for removing cold trub from hopped wort based on the results, but the optimization of the technology is needed for purposes of increasing Flux values and improve analytical parameters.

Item Type: Article
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2017
Volume: 23
ISBN: 978-963-306-563-1
Page Range: pp. 70-74
Uncontrolled Keywords: Analitikai kémia, Élelmiszeripari technológia, Sör
Additional Information: Bibliogr.: p. 73-74. ; összefoglalás angol nyelven
Date Deposited: 2018. Dec. 14. 08:41
Last Modified: 2018. Dec. 14. 08:41
URI: http://acta.bibl.u-szeged.hu/id/eprint/56158

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