Organic base fertilizer from municipal sewage sludge

Details Organic base fertilizer from municipal sewage sludge Organic base fertilizer from municipal sewage sludge

C - Chemistry, Metallurgy

05

F

C05F 7/00 (2006.01) C05D 3/02 (2006.01) C05D 9/00 (2006.01)

Patent

CA 2077508

ORGANIC BASE FERTILIZER FROM MUNICIPAL SEWAGE SLUDGE ABSTRACT OF THE DISCLOSURE 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°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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