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-   -   How to use oxygen to aerate wort? (http://www.homebrewtalk.com/f39/how-use-oxygen-aerate-wort-239411/)

lakedawgs 04-13-2011 01:00 AM

How to use oxygen to aerate wort?
 
I have been reading through the old posts regarding aerating wort with oxygen.
I have seen posts from " a light stream of bubbles for the last couple of minutes of chilling" to 5 or 10 liters per minute with no time frame given.

I have a couple of medical oxygen tanks since my mother passed in December and was wondering how to put them to use. I can get a 2 micron stone but would like to know how to most efficiently use it.
Thank you

avidhomebrewer 04-13-2011 01:55 AM

How I've oxygenated brews before is to cool them, transfer to the primary, then drop in a sanitized stone (don't touch it - the oils from your skin will clog the small holes in the stone) and line, then slowly turn on the O2 until the wort foams out of the top. Cover it to let the foam subside and repeat as necessary. I usually try for oxygenation time to be around 60-90 seconds.

Reelale 04-13-2011 02:02 AM

IIRC, 3 lpm for 1 minute gives a dissolved O2 concentration of around 10ppm. This link from Wyyeast confirms that ball park figure, as they didn't give a flow rate. http://www.wyeastlab.com/hb_oxygenation.cfm

lakedawgs 04-13-2011 02:34 AM

Thanks to both, good info.
I have read that you oxygenate before you pitch yeast, do you guys do that?
Any reason to use oxygen after pitching or initial fermentation?
THANKS

Carter1932 04-13-2011 02:38 AM

Quote:

Originally Posted by lakedawgs (Post 2832639)
Thanks to both, good info.
I have read that you oxygenate before you pitch yeast, do you guys do that?

Yes, yeast want oxygen during fermentation.


Quote:

Originally Posted by lakedawgs (Post 2832639)
Any reason to use oxygen after pitching or initial fermentation?

No, you'll risk oxidizing your beer so it will taste like cardboard and there is no reason to do it anyway.

If you have the oxygen tank I might suggest you look at getting one of these. http://www.williamsbrewing.com/22-AE...WAND-P490.aspx Love mine.

Reelale 04-13-2011 02:40 AM

I oxygenate the wort prior to pitching. You boil all the oxygen out during the boil, just need to replace it for initial yeast growth. No need for oxygen after the growth phase.

Shaneoco1981 04-13-2011 02:44 AM

You want to use oxygen before pitching for the yeast to help it reproduce quickly. At any other stage of fermentation, oxygen is your enemy. I know it sounds kinda back-ass-wards, but that's the way it is. As Revvy likes to say "Oxygenated beer = liquid cardboard". He is right. Palmer explains it best here:

http://www.howtobrew.com/section1/chapter6-9-3.html

He does a much better job then most people could.

McGreen 04-13-2011 03:10 AM

honestly, i've been in water treatment for many years and the best way to aerate is forced air or the WAY easier method: stirring.

pokerfreak2 04-13-2011 03:25 AM

Is there a way to measure ppm ?

Shaneoco1981 04-13-2011 12:36 PM

No, not with what we have available to us as home brewers. Just do a google search and ask how long to shake a carboy, or use a aquarium pump to aerate wort. You will find different times for all. If I remember correctly, I believe I heard/read that shaking the carboy and aquarium pump both take about 15 minutes. The oxygen tank with a regulator takes about 3 minutes...


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