[compost_tea] Re: Flow rate for air pumps

From: Steve Diver <steved_at_ncat.org>
Date: Fri, 18 Feb 2005 02:22:59 -0000

Thanks, Elaine -

Everybody please pay attention to
ppm vs. percent when referring to
dissolved oxygen. 

It is a common mistake... !!

Steve Diver


--- In compost_tea_at_yahoogroups.com, soilfoodweb@a... wrote:
> I think that Steve meant 6 ppm, which is 6 mg oxygen per liter, not
6% DO
>
> 6% dissolved oxygen would mean the brew is seriously anaerobic.
Normal
> percent oxygen is about 22% at sea level and room temperature. 
>
> At about 16% oxygen, you lose the aerobes, and facultative anaerobes
win.  At
> about 8% oxygen, the true anaerobes start to grow. 
>
> Elaine
>





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Received on Thu Feb 17 2005 - 22:14:48 EST

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