[compost_tea] Re: Pumping air in is not the best way to aerate your tea

From: elprune (elprune@yahoo.com)
Date: Fri Feb 21 2003 - 19:00:29 EST


Most of the oxygen in the bubble is released at the point it's
introduced into the water. The more movement at the top, as in a
waterfall hitting the surface will give both horizontal and vertical
circulation (depending on the force) resulting in better aeration
than just air bubbles alone.
  
--- In compost_tea@yahoogroups.com, lblair@a... wrote:
> This should be easy to check with a DO meter.
> However, circulation of the water vertically must ensure a
reasonable
> distribution of oxygen throughout.
> And o2 will dissolve at any air-water interface : the surface area
of
> the bubbles could vastly exceed the area of the top of the
container.
>
> What you say about fish is true where (1) there is no vertical
> circulation of the water, and (2) the o2 is depleted.
> Well, guess what? No bubbles in the tank -> depleted DO. Bubbles in
> tank -> happy fish!
>
> Unless of course you are basing your email on some scientific
> experiments, please explain!
>
> Lynton
> "elprune " wrote:
> >
> > Very little oxygen is actually dissolved from the air bubbles.
Most
> > exchange takes place at the top where the air/water interface is.
> > This is done from movement of the water at the top and that's
where
> > most of the dissolved oxygen is.
> >
> > When a fish in a poorly aerated tank is gasping for air, why do
you
> > think it goes to the top.
> >
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> >
> >
> >
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