highest gas exchange skimmer options

[karimwassef]

This is NOT what I was thinking of, by the way, but I did find it during my searches and I thought I should share for others who may find it interesting

<iframe width="560" height="315" src="https://www.youtube.com/embed/kjPcrCwgGIo" frameborder="0" allowfullscreen></iframe>

Again - I do not think this is a good idea (yet). It doesn't use the atmosphere as a balancing force... No idea what they do about the hydrogen gas...

 

[muttley000]

thanks muttley. were you thinking of the air pump or needle wheel?

I really have nothing scientific to lead me to or away from any of the options. I am interested in what you find

 

[muttley000]

Double post

 

[ca1ore]

FWIW, I would think that any form of air injection that results in fine bubbles would not be useful. I recall reading somewhere that I now cannot recall that the protein affinity quickly disables any diffusion .... thus my earlier comment that I don't think a skimmer is an effective diffuser. Rather like the old FW airstone. Diffusion want about the bubbles, rather the mechanical action of the bubbles to move water to the surface for oxygenation.

I would have thought something akin to a swamp cooler would work better, though evaporation would be a problem.

 

[karimwassef]

that supports the idea of a waterfall though.. a large sheet of water with high surface area to exchange gas.

I almost feel like I'm trying to create gills or lungs for the tank.

I can see a series of penductors arrayed in a line to create a white foamy waterfall in a large eggcrate structure with a two layer thick inlay of bioballs..

with fans that blow more fresh air through/at the eggcrate structure

holy salt-spray batman!

I couldn't resist... just threw everything except the kitchen sink in that.

well, technically, it would be over a basin... kitchen sink!!

 

[karimwassef]

like this?

<a href="http://s1062.photobucket.com/user/karimwassef/media/Designs/x11_zpsxqkbifnk.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/Designs/x11_zpsxqkbifnk.jpg" border="0" alt=" photo x11_zpsxqkbifnk.jpg"/></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/Designs/x12_zpsugl2tnoj.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/Designs/x12_zpsugl2tnoj.jpg" border="0" alt=" photo x12_zpsugl2tnoj.jpg"/></a>

overkill I know.

But I couldn't resist.

 

[karimwassef]

might make a good heat exchanger too... water is still cheaper than electricity.

but it still needs some refinement. A plastic plate on the side opposite the fans to avoid the air blowing a sheet of saltwater through.

Also the configuration of the penductors won't work as is. It would lose too much pressure by the 4th stage away. I'll need to use valves to reduce the flow through the most direct paths to make sure the others were still pressurized.

 

[Annap729]

And now you've cooled your water and need to reheat it.

Remind me again of the actual application and ultimate goal? Maximizing dissolved oxygen?

It's not nutrient export. You keep saying fresh air exchange but not being specific.


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[ca1ore]

might make a good heat exchanger too... water is still cheaper than electricity.

Right, that is essentially how an evaporative/swamp cooler works - though the heat exchange part is highly dependent on ambient humidity.

 

[karimwassef]

My tank is very hot. I never have a problem with it being too cold, even though it's in my garage.

While it was icing outside (subzero), I was running my chiller!! Anything that actively cools my water is welcome.

Humidity will be the bigger problem and I'll probably have to run my dehumidifier constantly now... which warms up the air too.

 

[karimwassef]

Let's leave it at fresh air exchange... getting more of the tanks water exposed to fresh air. That simplifies it to a mechanical problem of water flow vs chemical or biological.

 

[karimwassef]

Sure; you may get more cfm, but is it truly separating water molecules in a manner to provide highest exchange?
Again, focusing on cfm is like saying i need a car with a 500 gallon tank but it has one fuel injector versus a 50 gallon tank with the ability to import 8x the usable fuel ( 8 injectors ) v1 vs v8. Capacity versus efficiency.


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Don't quite agree with the analogy since the volume is also highly mixed. Penductors are used in fluid systems to actively mix liquids. They're used in fire hoses to actively inject air with the purpose of creating foam.

Here is what my penductor fed skimmer looks like for reference - 8' of bubbles that are submerged.

<a href="http://s1062.photobucket.com/user/karimwassef/media/320F8392-4BE8-4695-B1E9-F0C67309ABDC_zpstpgbvfnu.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/320F8392-4BE8-4695-B1E9-F0C67309ABDC_zpstpgbvfnu.jpg" border="0" alt=" photo 320F8392-4BE8-4695-B1E9-F0C67309ABDC_zpstpgbvfnu.jpg"></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/FC19F6E3-4EDC-4186-9971-A607076A04BE_zpsfppdvfbp.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/FC19F6E3-4EDC-4186-9971-A607076A04BE_zpsfppdvfbp.jpg" border="0" alt=" photo FC19F6E3-4EDC-4186-9971-A607076A04BE_zpsfppdvfbp.jpg"></a>

<a href="http://s1062.photobucket.com/user/karimwassef/media/BBC3548B-3CF2-44DF-9B5C-65B388EAFB33_zpshpfnzb51.jpg.html" target="_blank"><img src="http://i1062.photobucket.com/albums/t496/karimwassef/BBC3548B-3CF2-44DF-9B5C-65B388EAFB33_zpshpfnzb51.jpg" border="0" alt=" photo BBC3548B-3CF2-44DF-9B5C-65B388EAFB33_zpshpfnzb51.jpg"></a>

Which brings up a second question - is the period of interaction important? Wouldn't a skimmer that has water flowing down and bubbles flowing up be a better gas exchanger?