Patents Assigned to TRG International Waste Management, Ltd.
  • Organic base fertilizer from municipal sewage sludge
    Patent number: 5252116
    Abstract: A process for the production of a granular fertilizer product from biological or municipal sewage sludge is described. This process involves (1) gently blending the biological sludge with sufficient lime-containing material (preferably lime kiln dust) to raise the pH of the blended material to at least 11 pH units, and preferably at least 12 pH units, in such a manner as to avoid or prevent the formation of a slurry; (2) then conditioning the blended materials at a temperature of 180.degree. F.
    Type: Grant
    Filed: September 3, 1991
    Date of Patent: October 12, 1993
    Assignee: TRG International Waste Management, Ltd.
    Inventors: Earl R. Markham, John T. Markham, Edward G. Markham