| abstract |
Apparatus, materials, and methods for removing ammonia from fluid using metal hydroxides (e.g. zinc hydroxide) and metal cation loaded media (e.g. zinc loaded ion exchange resins); the metal hydroxides and metal cation loaded media may be regenerated with a weak acid (pK a between 3 and 7). Alternatively, ammonia is removed from fluids by using H 2 SO 4 and ZnSO 4 and metal cation loaded media; the metal cation loaded media may be regenerated with H 2 SO 4 and ZnSO 4 ; the ammonia containing H 2 SO 4 and H 2 SO 4 may be concentrated as necessary to form (NH 4 ) 2 SO 4 .ZnSO 4 .6H 2 O (ammonium zinc sulfate hexahydrate) crystals. These crystals are removed from the mother liquor and heated to temperatures exceeding 200° C. releasing NH 3 and H 2 O vapor upon the decomposition of the crystals. |