Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2005-07-12
2005-07-12
Cintins, Ivars C. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C071S021000, C210S667000, C210S669000, C210S710000, C210S726000, C210S903000, C210S906000, C210S916000
Reexamination Certificate
active
06916426
ABSTRACT:
A method of treating an animal waste slurry so as to efficiently extract nutrients, and which can be performed in a zero-discharge system, comprises flocculating the slurry, processing, e.g. filtering, the flocculated slurry to separate liquid from solid material, drying the solid material, processing the liquid to extract ammonium, phosphorous and potassium from the slurry, all within 24 hours, and preferably on average within 12 hours, of production of the waste material by animals. Since the urates of potassium and ammonium in the slurry take a few hours to break down, they remain in crystalline form and therefore a larger portion of the total amount of potassium and ammonium in the slurry can be extracted.
REFERENCES:
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patent: 5914040 (1999-06-01), Pescher et al.
patent: 6083386 (2000-07-01), Lloyd
patent: 6387145 (2002-05-01), Miele et al.
patent: 6409788 (2002-06-01), Sower
Bi Xiaotao
Helle Steve
Timmenga Hubert
Van Slyke Victor
Watkinson Paul
ATD Waste Systems Inc.
Cintins Ivars C.
Long Brian M.
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