Method of producing fertilizer product containing sewage sludge

Details Method of producing fertilizer product containing sewage sludge Method of producing fertilizer product containing sewage sludge

1985-01-14

1986-01-21

Schor, Kenneth M.

Chemistry: fertilizers

Processes and products

Organic material-containing

71 61, 71 63, 71 6402, 71 6403, G05F 700

Patent

active

045655634

ABSTRACT:
A fertilizer product consisting of solid, substantially dry, spherical or semi-spherical granules of ammonium sulfate and sewage sludge solids is formed by adding to a quantity of crystalline ammonium sulfate in a mixing vessel a second quantity of water-laden sludge while mixing the two together and driving off water from the sludge until granulation is complete. The sludge is added slowly enough, relative to the rate at which water is removed therefrom, that the ammonium sulfate crystals do not dissolve in the water initially contained in the sludge. Sludge solids effectively fill the voids between individual ammonium sulfate crystals in the resulting granules, thereby producing an end product of improved size and shape.

REFERENCES:
patent: 3050383 (1962-08-01), Wilson
patent: 3442637 (1969-05-01), Hudson
patent: 3758287 (1973-09-01), Scheel
patent: 3963471 (1976-06-01), Hampton
patent: 4038180 (1977-07-01), Talbert
patent: 4038181 (1977-07-01), Talbert
patent: 4125465 (1978-11-01), Turovsky
patent: 4167479 (1979-09-01), Besik

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