Apparatus and method for ammonia removal from waste streams

Details Apparatus and method for ammonia removal from waste streams Apparatus and method for ammonia removal from waste streams

B - Operations, Transporting

01

D

23/351, 362/40,

B01D 53/58 (2006.01) B01D 53/04 (2006.01) B01J 20/34 (2006.01) B01J 45/00 (2006.01) B01J 49/00 (2006.01) C01G 9/06 (2006.01) C02F 1/42 (2006.01)

Patent

CA 2285277

Apparatus, materials, and methods for removing ammonia from fluids using metal hydroxides (e.g. zinc hydroxide) and metal loaded media (e.g. zinc loaded ion exchange resins); the metal hydroxides and metal loaded media may be regenerated with a weak acid (pK a between 3 and 7). Alternatively, ammonia is removed from fluids by using H2SO4 and ZnSO4 and metal loaded media; the metal loaded media may be regenerated with H2SO4 and ZnSO4; the ammonia containing H2SO4 and ZnSO4 may be concentrated as necessary to form (NH4)2SO4.ZnSO4.6H2O (ammonium zinc sulfate hexahydrate) crystals. These crystals are removed from the mother liquor and heated to temperatures exceeding 200 °C releasing NH3 and H2O vapor upon the decomposition of the crystals.

L'invention porte sur des appareils, des matériaux et des procédés d'extraction d'ammoniaque de fluides recourant à des hydroxydes métalliques (par exemple de zinc) et à des milieux à charge métallique (par exemple des résines échangeuses d'ions à charge de zinc). Les hydroxydes métalliques ainsi que les milieux à charge métallique peuvent être régénérés par un acide faible (d'un pKa compris entre 3 et 7). Dans une variante, l'extraction de l'ammoniaque se fait par du H2SO4 et du ZnSO4 dans un milieu à charge métallique pouvant être régénéré par le H2SO4 et le ZnSO4. L'ammoniaque contenant le H2SO4 et le ZnSO4 peut être concentré autant que nécessaire pour donner des cristaux de (NH4)2SO4,ZnSO4,6H2O (sulfate hexahydrate d'ammonium zinc), lesquels cristaux sont retirés de la liqueur mère, puis chauffés à plus de 200 DEG C, leur décomposition produisant du NH3 et de l'eau.

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