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TitleContinuous primary beer fermentation with brewing yeast immobilized on spent grains
Author(s)Brányik, Tomáš
Vicente, A. A.
Cruz, José Machado
Teixeira, J. A.
Spent grains
Issue date2002
PublisherInstitute of Brewing & Distilling
JournalJournal of the Institute of Brewing
Citation“Journal of the Institute of Brewing”. ISSN 0046-9750. 108:4 (2002) 410-415.
Series/Report no.2002;03
Abstract(s)This work demonstrated the technological feasibility of the three-phase airlift bioreactor (ALR) with brewing yeast immobilized on spent grains (a brewing by-product) for continuous beer production. The optimum fermentation performance of the one stage immobilized cell bioreactor was achieved at residence times between 18–25 h (dilution rate 0.04–0.055 hˉ¹) and was characterized by an apparent degree of attenuation in the range of 70–80%. The productivity of the system in terms of ethanol concentration in green beer (ca. 4.2%) was satisfactory. Although the diacetyl concentration in the young beer was high (0.32 mg Lˉ¹ at D = 0.04 hˉ¹) it is speculated that the level could be reduced by cell growth control, aeration and temperature optimisation. The immobilized yeast fermentation in the ALR was shown to be robust in recovery after process upsets.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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