Re: [compost_tea] Vortex Brewer.
The important factor is mixing of water at the bottom of the tank so you
need to place the air source at the tank bottom to move water completely in
the tank. For aeration it is the action at the water surface that is
important entraining water at the surface. That is where aeration is mostly
occurring. Some oxygen will be exchanged as air bubbles pass through the
water column but that is not the most important place for exchange. Ok?
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-----Original message-----
From: Will Buck <willbuck76_at_yahoo.com>
To: compost_tea_at_yahoogroups.com
Sent: Tue, May 24, 2011 00:19:17 GMT+00:00
Subject: [compost_tea] Vortex Brewer.
Hi, I am in the process of building a 240 gallon Vortex brewer.
My first brew went anaerobic almost immediately. Clearly I have undersized
the air supply and while I would appreciate advise on which pump I should
purchase (I used an Eco7 that allegedly provides7 cfm, it appears that I
need to at least double that rate), my question is more about the properties
of an air lift pumps so I can maximize the amount of DO.
My design is similar to Bobby Grimes. I purchased a cone bottom tank that I
mounted on a stand so the tank is about 4 feet off the ground (ideal for
gravity filling the spray rig). The manifold is attached to the base of the
stand and there are three 2 inch pipes that return water over the top of the
tank via air lift from a 17 inch air stones.
My question is at what depth should I put the air stones in the pipes? If I
put the stones near the bottom of the pipe I thought this would be ideal
because the air bubbles would be in contact with the water for a longer
period of time as they rose up the pipe thus increasing DO. But of course
the deeper the air stone the lower the performance of the air pump because
the resistance pressure is greater. In other words, is there any rule of
thumb regarding the depth of the air stone?
This question becomes very important as I look at purchasing a new pump as
regenerative blowers loose performance very quickly the more pressure they
are working under.
I would really appreciate any h
Received on Tue May 24 2011 - 11:12:44 EDT
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