twd000
Well-Known Member
I recently read about yeast oxygen scavenging to de-aerate mash water. Was wondering if the same principle could be used to purge a receiving keg, rather than pushing out 5 gallons of sanitizer. If it worked it would also have the benefit of topping up my batch size - I could ferment 4 gallons of high-gravity wort in a corny keg, then push the finished beer into a receiving keg with 1 gallon of de-aerated water to reach my target diluted FG.
CO2 weighs 1.98 kg/m^3 at atmospheric pressure
a 5 -gallon keg holds 0.01893 m^3 of volume
to fill a keg once with CO2 requires 0.0375 kg of CO2
table sugar produces 1/2 its weight in CO2 during fermentation, so I need 75g of sugar to produce 0.0375 kg CO2
75g of sugar dissolved in 1 gallon of water is a 1.008 solution, and 100% fermentable.
If I wanted to dilute the air headspace with CO2 by a factor of 2x, I'd need 150g sugar, 3x would require 225g sugar, etc.
So my question is how many gas-dilution multiples do I need to get O2 down below __? ppb
If you were only interested in keg purging instead of high-gravity dilution, you could dissolve your 75g of table sugar in just 0.25 gallon of water to make a 1.030 solution
https://www.ikegger.com/blogs/ikeggerworld/how-much-co2-is-produced-during-fermentation
http://braukaiser.com/wiki/index.php/Accurately_Calculating_Sugar_Additions_for_Carbonation
CO2 weighs 1.98 kg/m^3 at atmospheric pressure
a 5 -gallon keg holds 0.01893 m^3 of volume
to fill a keg once with CO2 requires 0.0375 kg of CO2
table sugar produces 1/2 its weight in CO2 during fermentation, so I need 75g of sugar to produce 0.0375 kg CO2
75g of sugar dissolved in 1 gallon of water is a 1.008 solution, and 100% fermentable.
If I wanted to dilute the air headspace with CO2 by a factor of 2x, I'd need 150g sugar, 3x would require 225g sugar, etc.
So my question is how many gas-dilution multiples do I need to get O2 down below __? ppb
If you were only interested in keg purging instead of high-gravity dilution, you could dissolve your 75g of table sugar in just 0.25 gallon of water to make a 1.030 solution
https://www.ikegger.com/blogs/ikeggerworld/how-much-co2-is-produced-during-fermentation
http://braukaiser.com/wiki/index.php/Accurately_Calculating_Sugar_Additions_for_Carbonation