Abstract: An ammonia-containing liquid or an ammonia-containing gas is made to contact a porous coordination polymer in which a metal ion and an organic ligand coordinately bonded, ammonia is adsorbed to the porous coordination polymer, and the ammonia is desorbed from the ammonia-adsorbed porous coordination polymer to recover the ammonia. The porous coordination polymer that contacts the ammonia-containing liquid preferably has a water-soluble solvent adhered thereto. The ammonia-containing gas is preferably adjusted such that water is contained at an amount of 106 parts by mass or more when the ammonia content is 100 parts by mass.

Abstract: To realize easy management of gas residual amount while reducing the burden on gas users, the gas treatment system 1 according to an embodiment of the present disclosure includes a first container 5A1 that houses a first porous metal-organic framework capable of collecting a first gas contained in a mixed gas flowing from an inlet side, a second container 5B1 that houses a second porous metal-organic framework capable of collecting a second gas contained in the mixed gas that flows in series with the first container 5A1, a first gas detector TCD11 that is provided as a detection target in a space of the flow path on the downstream side of the first container 5A1 and can detect the first gas, and a control device 100 that outputs at least information on the state of the first container 5A1 based on the detection information based on the first gas detector.