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



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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