Chemically disinfected sewage sludge-containing materials

Details Chemically disinfected sewage sludge-containing materials Chemically disinfected sewage sludge-containing materials

1991-05-20

1995-06-13

Wyse, Thomas

Liquid purification or separation

Processes

Chemical treatment

210766, 210774, 48197R, 48197A, 48209, C02F 1114, C02F 150

Patent

active

054239923

ABSTRACT:
A chemically disinfected sewage sludge-containing material comprising (1) an aqueous slurry of sewage sludge-containing material having a solids content in the range of about 10 to 30 wt. %; and (2) a chemical disinfectant comprising a water soluble silicate of sodium in the amount of 5 to 20 wt. % (basis dry wt. of said sewage sludge). In one embodiment, a pumpable chemically disinfected sewage sludge-containing material was produced by the steps of (1) dewatering sewage sludge to produce an aqueous slurry having a solids content of about 10 to 30 wt. %; (2) shearing the dewatered sewage sludge from (1) at a temperature in the range of about ambient to 230.degree. F. and at a shear rate of at least 30 per second for a period in the range of about 0.5 to 180 minutes; and (3) mixing the following materials together at a temperature in the range of about ambient to 230.degree. F. to produce a pumpable aqueous slurry having a solids content in the range of about 30 to 65 wt. % and a pH of at least about 11: (a) about 0.5 to 7 parts by wt. of sheared dewatered sewage sludge from (2); (b) about 5 to 20 wt. % of a silicate of sodium (basis total dry weight of sewage sludge); and (c) about 5 to 7 parts by wt. of at least one material from the group consisting of sewage sludge-containing material, liquid hydrocarbonaceous fuel, solid carbonaceous fuel-containing material, and mixtures thereof.

REFERENCES:
patent: 4793927 (1988-12-01), Meehan et al.
patent: 4822379 (1989-04-01), Thompson
patent: 5114541 (1992-05-01), Bayer
patent: 5217625 (1993-06-01), Khan et al.

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