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Re: [compost_tea] Pumps and Aerob-a-jet



Lynton,
 
I don't think the micro bubbles accumulate like that.  There is a saturation point... just as there is for DO.  From what I have read, there is no evidence to support an endless accumulation of microbubbles and therefore an overflow situation.  Micro bubbles can stay in suspension in water for a long time, but there is a physical limit that is governed by water temperature, what is dissolved or suspended in the water, atmospheric pressure, the size of the bubbles, and how many bubbles are present.  They stay in suspension because there isn't enough force from the water around the bubbles to cause them to combine or rise out of the solution.  Why they stay in suspension has to do with water tension that allows them to be suspended.  As they reach a saturation point, which is determined by the water tension needed to retain them, they will come out of suspension because there isn't enough water tension to allow them to stay in suspension.  There's a very similar thing that limits the amount of DO from the atmosphere that can physically be present in water.  Many of the same kind of variables apply... water temperature, what is dissolved or suspended in the water, atmospheric pressure, and the amount already in the water. 
 
--Thomas Giannou
http://www.tandjenterprises.com
 
 
----- Original Message -----
Sent: Tuesday, May 13, 2003 4:51 AM
Subject: Re: [compost_tea] Pumps and Aerob-a-jet

I think there is a difference between a sewage works and a CT brewing
tank: I assume one has a flow-through, the other one body of water that
remains.  I think what Elaine was describing is what happens in the
latter case.  If you keep pumping in more bubbles and they stay in
suspension then you get more and more air in the water ( in fact, unless
there is some wierd law operating at the 20 micron bubble size, I would
expect the container to overflow at some time).
2c from me,
Lynton

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