Apparatus and method for ammonia removal from waste streams

Chemistry of inorganic compounds – Nitrogen or compound thereof – Ammonia or ammonium hydroxide

Reexamination Certificate

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C210S269000, C210S674000, C210S681000, C423S238000, C423S517000

Reexamination Certificate

active

06838069

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 (pKabetween 3 and 7). Alternatively, ammonia is removed from fluids by using H2SO4and ZnSO4and metal cation loaded media; the metal cation loaded media may be regenerated with H2SO4and ZnSO4; the ammonia containing H2SO4and H2SO4may 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 NH3and H2O vapor upon the decomposition of the crystals.

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