Title: Process for treating sewage sludge and fertilizer products thereof

Abstract: An apparatus for and a process of treating sludge filter cake and the granular product thereof which comprises reducing the particle size and moisture content of the sludge cake, sterilizing the sludge cake by contacting the sludge cake with an N-methylol-urea solution, reacting the N-methylol-urea solution with the sludge cake at a pH of 3 to 5 while agitating the sludge particles to provide a granular-reaction product, and drying the product to provide a granular, high-nitrogen, odorless fertilizer or animal feed supplement product.

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Inventors: O'Donnell, James M. (Slatersville, RI, US)

Application Number: 472714
Filing Date: 1974-05-23
Publication_date: 1976-03-09
Assignee: Orgonics, Inc. (Slatersville, RI)
Primary Class(es): 71/12 71/13, 71/28, 210/609, 210/764, 210/770
Other Classes:
US Patent Ref:

3073693	Jan, 1963	Nielsson et al.	71/13.
3279979	Oct, 1966	Gribnau et al.	71/28.
3655395	Apr, 1972	Karnematt	71/28.
3705794	Dec, 1972	Czurak et al.	71/29.

Other Refs:
Primary Examiner: Hart, Charles N.
Assistant Examiner: Lander, Ferris H.
Attorney: Crowley; Richard P.