Dryer Patents (Class 110/224)
  • Patent number: 4098006
    Abstract: A process for drying organic waste, such as sewage sludge, by contacting the organic waste with hot vapors. Partial dewatering of the organic waste is achieved by admixture with a recycled portion of dried solids followed by extrusion of the mixture. The resultant extrudate is then dried, and the unrecycled portion is extruded in a separate operation to form compacted granules having good flow characteristics and suitable for application by commercial fertilizer spreaders. A plasticizer and an extrusion aid may be added to the dried material prior to extrusion.
    Type: Grant
    Filed: July 7, 1977
    Date of Patent: July 4, 1978
    Assignee: UOP Inc.
    Inventor: Vere Maffet