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I'm not sure if this is exactly answering your question and I cannot cite any sources in particular to aid either. However, when I home brew I add a little plastic device on the top of the sealed, fermenting beer which steadily allows the CO2 to escape throughout the process. I'm sure large breweries have a similar method of doing the same thing. As far as what is done with the escaped CO2, I'm not sure but I can assume it is simply released. Feel free to improve upon this answer.

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14y ago
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Q: What does a brewery do with extra CO2 made during fermentation?
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