Would someone be able to get a hold of SAS and get an
Aerob-a-jet, make a brew of TEA and have it tested out in SFI? After two weeks
of continual effort, I still can not get someone to answer the phone in
SAS.
Regards TaChung Huang (¶À¤j©¾)
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
----- 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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