Years ago a process called "de-gassing" was proposed for removal of ammonia from aquarium water. I performed a search on this site but could not find anything about de-gassing. As I recall it is possible to "de-gas" ammonia from the system water using a wet dry filtration system, but it is not practical. The draw back is that the wet dry tower must be massive (larger than the tank?) and a huge amount of air must flow though it.
HTH
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