40 CFR 63.2192 - What definitions apply to this subpart?
Batch means a single fermentation cycle in a single fermentation vessel (fermenter).
Batch monitoring period means the period that begins at the later of either the start of aeration or the addition of yeast to the fermenter; the period ends at the earlier of either the end of aeration or the point at which the yeast has begun being emptied from the fermenter.
Brew means the mixture of yeast and additives in the fermenter.
Brew ethanol means the ethanol in fermenter liquid.
Brew ethanol monitor means the monitoring system that you use to measure brew ethanol to demonstrate compliance with this subpart. The monitoring system includes a resistance element used as an ethanol sensor, with the measured resistance proportional to the concentration of ethanol in the brew.
Brew-to-exhaust correlation means the correlation between the concentration of ethanol in the brew and the concentration of VOC in the fermenter exhaust. This correlation is specific to each fed-batch fermentation stage and is established while manufacturing the product that comprises the largest percentage (by mass) of average annual production.
Emission limitation means any emission limit or operating limit.
Fed-batch means the yeast is fed carbohydrates and additives during fermentation in the vessel. In contrast, carbohydrates and additives are added to “set-batch” fermenters only at the start of the batch.
1-hour period means any 60-minute period commencing on the minute at which the batch monitoring period begins.
Specialty yeast includes but is not limited to yeast produced for use in wine, champagne, whiskey, and beer.