Process for treating sewage sludge and fertilizer products there

Details Process for treating sewage sludge and fertilizer products there Process for treating sewage sludge and fertilizer products there

1974-05-23

1976-03-09

Hart, Charles N.

Chemistry: fertilizers

Processes and products

Organic material-containing

71 13, 71 28, 210 18, C05F 300, C05C 900, C02C 300

Patent

active

039429709

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.

REFERENCES:
patent: 3073693 (1963-01-01), Nielsson et al.
patent: 3279979 (1966-10-01), Gribnau et al.
patent: 3655395 (1972-04-01), Karnematt
patent: 3705794 (1972-12-01), Czurak et al.

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