The short answer to your ...

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The short answer to your question, "can you SELECTIVELY remove ammonia as ammonium" is NO!  If you figure out a way to do it, then you will have the corner on a market that it boudless.  Even to get rid of the ammonia, you have to eithe precipitate it or oxidize it.  This is usually done via microbiology for oxidation.  Then you would have to denitrify to get your nitrogen gas, after your oxidative nitrification (formation of Nitrate and then Nitrite).  Good luck with this one!  I will be watching for you on the cover of Time, if you pull it off.  Best Regards, Sean L. Roop