Chemistry: fertilizers – Processes and products – Organic material-containing
Patent
1991-09-03
1993-10-12
Lander, Ferris
Chemistry: fertilizers
Processes and products
Organic material-containing
71 25, 71 6405, C05F 700
Patent
active
052521168
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. and a pH of at least 11, and preferably at least 12, for a time sufficient to effectively kill or otherwise destroy a significant percentage of the pathogens present in the sludge; (3) blending the conditioned sludge with a second lime-containing material (preferably cement kiln dust or fly ash) and a binder (preferably lignosulfonate); (4) then agglomerating the blended materials to form pellets or granules; (5) drying the pellets or granules to a moisture content of less than 15 weight percent; (6) and curing the dried pellets or granules at ambient temperatures for a time sufficient for the pellets or granules to develop sufficient physical strength to be used as a fertilizer. The product of this invention can be used directly as a low-grade fertilizer or, if desired, additional nutrients or other additives can be added to upgrade its fertilizer value.
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Agitative Agglomeration, The State of the Art (1987), pp. 59-75, Carl A. Holley, Ferro-Tech, Wyandotte, Mich. 48192.
Binders and Binder Systems for Agglomeration, pp. 77-86, Carl A. Holley, President, Ferro-Tech, Wyandotte, Mich. 48192, Aug. 1981.
Waste Agglomeration, Carl A. Holley, President, Ferro-Tech, Incorporated, Wyandotte, Michigan U.S.A., pp. 99-125, Nov. 1989.
Cement Kiln Dust Utilization and Treatment, pp. 163-165, Carl A. Holley, President Ferro-Tech, Aug. 1983.
The Ferro-Tech-Turbulator, Ferro-Tech, Wyandotte, Mich. 48192, pp. 269-271, Feb. 1987.
Markham Earl R.
Markham Edward G.
Markham John T.
Lander Ferris
TRG International Waste Management, Ltd.
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