Circulate it within a semi-closed system full of funghi. A reverse breeder reactor - a condensing decayer. Vent excess material to radiology equipment. Then sp

Circulate it within a semi-closed system full of funghi. A reverse breeder reactor - a condensing decayer. Vent excess material to radiology equipment. Then sprinkle in some high-melanin humans, to grow your very own super-mutant facility personel. Perhaps also feed them mushrooms, to speed up the adaptation process. The next generation will be... autotrophic?