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
www.ikegger.com
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

How Much CO2 Is Produced During Fermentation?
So, the other day I was wondering if the CO2 coming out of my fermenter could be used in two ways. 1. To carbonate the beer during fermentation 2. To flush out my kegs and all my gear ready for when the brew is ready Turns out, hell yes you can! Save time and buying CO2 with just a few simple parts!
