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Organic containing sludge to fertilizer alkaline conversion process

  • US 8,202,342 B2
  • Filed: 05/09/2011
  • Issued: 06/19/2012
  • Est. Priority Date: 09/15/2005
  • Status: Active Grant
First Claim
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1. A method of fertilizer manufacture comprising:

  • creating a thixotropic paste from a composition containing biosolids;

    adding an oxidizing agent to the paste;

    adding a first amount of ammonia to the paste to produce a pH of 10 or higher;

    adding an acid to the paste to produce heat and at pH 7.0 or less and a second amount of ammonia to the paste to raise the concentration of free ammonia to above 10,000 ppm;

    adding a granulating agent to the paste;

    extruding or granulating the paste; and

    drying the extruded or granulated paste to a dryness of 90% or more of solids.

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