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Re: [compost_tea] Re: Micro bubbles + water pump...



Hi Dan,
 
Yes.  You are missing something.  The smallest unit can put micro bubbles (they are about 20 microns in diameter) into suspension in the water.  Don't think of the Aerob-A-Jet as a device to circulate the water.  It saturates the water with micro-bubbles.  These kind of bubbles are in suspension for a long period of time.  For example. if you were to saturate a gallon of water with 20 micron sized micro-bubbles, went to bed and got up in the morning, they would be there the next morning.  The Aerob-A-Jet was designed to keep DO in large bodies of water at very high levels.  I have also seen venturie's that can produce 20 micron micro bubbles. 
 
If you think of the best ceramic air stone that makes small bubbles, they are about 100 microns in size and will come out of the water fairly quickly.  With the micro bubbles at 20 microns, they have different physical properties with respect to water tension and one can maintain a lot of air in suspension for the aerobic bacteria and anything else that loves the presence of continuous levels of fairly high DO. 
 
The price of the smallest Aerob-A-Jet puts it off the list for many CTers, but if one had a business of making and applying large volumes of compost tea... such as a landscaper with hundreds of accounts or a large farming operation, then the Aerob-A-Jet would be very desirable because with such a device protruding into a compost tea tank, DO would never be a problem.  This device would also solve the problem of when you stop brewing the tea and are now ready to apply the tea and are concerned about the DO levels dropping and affecting the bacteria because the DO was too low.  I think that problem would be history as far as the DO component of that particular problem is concerned.
 
I have seen tests with 20 micron bubbles in sea water and there is so much air in suspension, the water looks like milk!  You can't see through the sea water.  (pun intended!)  With so many things suspended and dissolved in compost tea, I would expect much the same thing.  With the Aerob-A-Jet constantly running, air is being pushed out into the water at a high rate, but water is not being circulated through the device.  I don't think it would take very long for the smallest Aerob-A-Jet to saturate and maintain a lot of suspended air bubbles in a fairly large tank of tea water.  If a lot of water had to be circulated through the device, then it wouldn't be long before the process would efficiently clear out all of the bacteria and fungi in the process of making those 20 micron micro bubbles. 
 
If you want to get hold of a distributor for the Aerob-A-Jet, call the manufacturer and they will get you in contact with a distributor in your area.  I was talking with a distributor in Los Angeles, but don't have the contact information.  I didn't keep it because I figured I'd never get such a device that would cost that much.  But, with people buying $1,200 brewers, I guess the Aerob-A-Jet might have a place after all eh?
 
--Thomas Giannou
http://www.tandjenterprises.com
 
----- Original Message -----
From: lmvine
Sent: Friday, May 02, 2003 5:06 AM
Subject: [compost_tea] Re: Micro bubbles + water pump...

> Hi Tachung,

> I think it was between $400 and $450 from a distributor in Los
Angeles.

The Aerob-A-Jet Model 100 Specifications says 0.22 CFM air.  This is
lower than that required by 15 gallon CT brewers.  I can see were it
would provide SOME aeration for a septic tank where it is already
anerobic.

T. G. am I missing something?
Dan

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