New Brewing Lager Beer by Gregory J. Noonan

Author:Gregory J. Noonan [Noonan,, Gregory J.]
Language: eng
Format: epub
Tags: CKB007000 Cooking / Beverages / Beer
ISBN: 9781938469237
Publisher: Brewers Publications
Published: 2015-10-15T16:00:00+00:00

The Fermentation Lock

Although the release of carbonic gas from the fermentation gives it some measure of protection against oxidation and contamination, covering the fermenter immediately after pitching and fitting it with a fermentation lock is advisable. The airlock allows the pressure created by the carbonic gas to push past the liquid in the lock without allowing air in. This prevents the reverse passage of airborne wild yeast and bacteria into the culture-yeast fermentation. Oxygen trapped within the fermenter by the lock is readily driven off by the rising blanket of heavier carbon dioxide produced by the ferment.

The liquid in the lock should be maintained at a constant level, but not so deep that it puts the fermenting beer under any appreciable pressure. During the primary fermentation, it is essential that virtually no carbon dioxide remain in solution, since it carries malt and hop debris into the head and sulphur compounds and esters out of the ferment.

The purpose of the fermentation lock is to prevent infection. It must be kept perfectly clean. The trap can be filled with an antiseptic solution in which microbes cannot exist, a practice that is advisable during later fermentation. Of course, this solution must not contact the ferment either by splashing caused by excess pressure or by careless handling.

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