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  1. #21
    Moderator urbanfarmer's Avatar
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    Re: Aquaponics 101 Part Three: System Design, Continue

    Hey guys, I can't believe I did not see this discussion earlier... I blame JCO for getting rid of the portal... GRRRRR

    Badflash you are right, but my understanding is that the gas exchange in short water columns like we have in most of our systems is minimal compared to what occurs at the surface of the water.

    ANYWAY, I have asked Dr. Wilson Lennard to provide me some of the research he has been privy to over the years to share with you guys, but according to him the gas exchange at the surface compared to the gas exchange from bubbles beneath is 50:1. This is pretty significant... I will post when I get a reply. There has to be some good research floating around the web here somewhere as well...

  2. #22
    Moderator badflash's Avatar
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    Re: Aquaponics 101 Part Three: System Design, Continue

    Show me the DATA!
    The best fertilizer is the farmer's shadow

  3. #23
    Moderator badflash's Avatar
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    Re: Aquaponics 101 Part Three: System Design, Continue

    OK, I just did a short calculation. I assumed the bubble size of .015" diameter and the air flow was 1/10 cubic foot per minute.

    This would give a total surface area for the bubble of 40 square feet per minute. The surface area of a tank, say a 20 gallon long aquarium is 2.5 square feet. This means that to be equal to the bubbles mathematically you would need to turn over the surface 16 times a minute.

    Now if we are talking a pond and a few air stones, I can see the surface being a big deal, but if you are talking a 100 gallon pool and some good air stones, that is a totally different story.

    Time to buy a DO meter.
    The best fertilizer is the farmer's shadow

  4. #24
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    Re: Aquaponics 101 Part Three: System Design, Continue

    [img][/img]12" tube 3 feet long with air difusser in the bottom.

  5. #25
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    Re: Aquaponics 101 Part Three: System Design, Continue



    showing bottom of tube construction

  6. #26
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    Re: Aquaponics 101 Part Three: System Design, Continue



    air and water column produced by this aerator. this aerator is used in the 1000 gal vat. not shown is the grid and the screen that houses the ceramic biomedia in the lower portion of the tube. since the vat is 4' x 4' x 14' if would be better too have two of these in operation, but it does do a fair job of circulating and aerating the water.

  7. #27
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    Re: Disolve Oxygen levels

    in the many different configurations i have used in hatcheries, i have found no other method that produces upheavel, circulation, useability, and aeration in a useuable physical size and shape as microbubble aeration produces. (on central aquatic systems i prefer the cascading water column through biomedia with reverse flow aeration.) this certainly is not the application to end all applications, always looking for a better system design that would provide even better results.

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