Abstract
A continuous, primary bottom fermentation system for beer brewing with the ability to maintain a stable and high level of yeast activity during its long operation was designed, and its performance was evaluated. The basic strategy was to realize the same physiologically or morphologically synchronized changes in yeast and wort constituents during the main fermentation as those realized in traditional bottom beer fermentations. The liquid nonabsorbent carrier particles used to fill the fermenter successfully promoted the fermentation of wort sugars, which were supplied from the top of the fermenter, by preventing their rapid sinking. In addition, the carrier particles displayed other benefits that resulted in effective operation. The quality of the harvested young beer was satisfactory but had a low ester content that might be improved by further studies.
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