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Foam Fractionators


Nelson Gerundo ( I have a lot of experience with high-pressure, axial-bombardment, foam fractionators (FFs).


Foam fractionators can extract Serratia macrescens, Bacillus subtilis, Vibrio Cholerae, V. parahaemolyticus, and they should be able to extract V. alginolyticus, V. campbelli, V. casei, V. fluvialis, V. penaecida, V. vulfinicus and V. harveyi.  They should also be able to extract many larger aquatic organisms.  They are cheap, portable, durable, long lasting, efficient, functional, safe, reliable, affordable, simple—and you can build them yourself and add your own control options.


Daniel Gruenberg ( Nelson, scientifically speaking, just because you find certain organisms in the scum from a FF gives you zero information about the removal rate.


I’m not trying to start a battle here, and I agree with the general concept that FF coupled with oxidation is better than oxidation alone.


Again I do appreciate your skills in building cheap and effective systems for FF.  It’s really great work.


Nelson Gerundo ( Daniel, I’m talking about large volumes of scum.  A foam fractionator can quickly clean an entire algal tank.  I have been using FF to concentrate Thalassiosira pseudonana from a huge mass algal tank into a drum of diatom slurry concentrate.  Sun dry this on a rooftop to make a diatom powder.


Do you know of anybody that is using FF to produce diatom powder?


Patrick Wood ( While FF and ozone might be good in some situations, Dallas Weaver is right: At shrimp hatcheries, nothing beats mechanical filtration, which is getting cheaper and becoming nearly maintenance free.


Sources: 1. The Shrimp List (a mailing list for shrimp farmers).  Subject: Foam Extracting Device in Indoor Aquaculture.  April 5-6, 2017.  2. Bob Rosenberry, Shrimp News International, April 19, 2017.

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