Aeration - Page 2

Truble · 07-18-2006, 04:58 PM

Corrected. That is what I meant, though the letter mis-spoke.

TekelBira · 07-19-2006, 01:30 AM

Quote:

Originally Posted by Mishkin

What happens if it is oxygenated?

If you "aerate" the worth while it is still "hot", as it is cooling down to yeast pitching temperature, there is a window of opportunity for "bad" bugs to find oxygen and thrive before yeast takes over and wins the battle.

There is also "too much aeration" possibility. If there is more oxygen than yeast could consume, it will stay and result oxidation. (Statement is not based on my experience but reading few books I have as reference sources. If disputed, I'l look it up to provide citation.)

Exo · 07-19-2006, 07:09 AM

The way I look at it is this. Have you ever stared at all the freaking dust suspended in the air when sunlight streams into your home? That stuff is definitely far from sanitized. The more you move your wort around the more you chance getting significant amounts of nasties into the wort. That's why aeration systems have filters on them.

When I use my wort chiller I have the cover on, gently agitating the wort every so often w/o surface agitation so I don't get the temp. barriers.

Wait till your wort is cool, then siphon using a small tube at the top of your bucket/carboy (with lid on if bucket) and make some bubbles. Then stop your airlock hole and shake for a bit...as long as the wort is <80deg. you should aerate real well.

Me, I just broke down and bought an O2 aeration system which was on sale a few days ago...

YMMV?

gauthierk · 07-20-2006, 12:17 AM

The biggest difference in my lag time came with a starter but by using two air stones with a pre filter on them I shaved another 5 hours off of my lag time. (spending special time to sanitize the stones and hoses) It has made a difference.

**ajf** · 07-20-2006, 03:24 AM

Quote:

Originally Posted by Sephro

Right theory wrong wording

You don't want to oxygenate wort ever... You do want to aerate the wort. If you aerate hot wort you will run the risk of oxygenating it. When you aerate the wort you add O2 into the mix.. But when you oxygenate it you are actually fusing the O2 to the wort.

With all due respect, aeration and oxygenation are effectively the same thing. They both result in dissolving oxygen into the wort which is desirable before fermentation has started.

What you want to avoid is oxidation, which is the chemical bonding (or fusing) of oxygen with the wort.

-a.

Beer Snob · 07-20-2006, 04:35 AM

Quote:

Originally Posted by Brewno

Some just pour the wort into their cool water and consider that enough

That is MOST CERTAINLY not enough. On top of areation you want to make sure things are mixed up well too. I got this thing that attaches to my drill and it works great. All you need to do is shake it a bit. When you get real tired, shake it for a bit more and that should be enough.

Beer Snob · 07-20-2006, 04:41 AM

Quote:

Originally Posted by ajf

With all due respect, aeration and oxygenation are effectively the same thing. They both result in dissolving oxygen into the wort which is desirable before fermentation has started.

What you want to avoid is oxidation, which is the chemical bonding (or fusing) of oxygen with the wort.

-a.

Well... I can understand why you say that aeration and oxygenation are the same thing.... but I also say that I have never seen the word oxygenation used when the author meant aeration. Hmm... actually I can't even say I have seen the word oxygenation used. Perhaps the word is too close to oxidation so it is avoided.....

**kornkob** · 07-20-2006, 03:26 PM

Quote:

Originally Posted by Beer Snob

That is MOST CERTAINLY not enough. On top of areation you want to make sure things are mixed up well too. I got this thing that attaches to my drill and it works great. All you need to do is shake it a bit. When you get real tired, shake it for a bit more and that should be enough.

I have to say that I don't work anywhere near that hard at aeration and I get good results.

partial boil goes on top of the cool water (although I cool the wort to 80-ish before I add it to the carboy) and I shake for a while in the carboy to get the water throughoughly mixed. But not till 'I get tired'. I can't imagine I shake the thing more than a minute or 2 tops.

**budbo** · 07-20-2006, 03:59 PM

I have a stone on a line with a filter hooked up to fish tank pump. I just drop it in and let it go until the wort is pitch temp..... since switching from the shake it up method I found I get starts almost as fast as a starter just pitching the smack pack or vial. There is a noticable difference.

kthorson · 07-28-2008, 06:45 PM

Quote:

Originally Posted by TekelBira

There is also "too much aeration" possibility. If there is more oxygen than yeast could consume, it will stay and result oxidation. (Statement is not based on my experience but reading few books I have as reference sources. If disputed, I'l look it up to provide citation.)

I love building gadgets for my brewing and would like to make an inline aerator, but the guy at my LHBS said I needed to be careful not to over aerate the wort. Does anyone know how easy it is to over aerate? I am using O2 but could switch back to filtered air if there is an issue. I also spoke to a brewer at a local brewery this weekend and he didn't think as a home brewer that I could get too much 02 in there.

Kyle