Process for disposing of sewage sludge

Gas: heating and illuminating – Processes – Fuel mixtures

Patent

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Details

48197A, 48209, 48DIG7, 110342, 110346, 210758, 252373, C10J 346

Patent

active

052735567

ABSTRACT:
A process for disposing of sewage sludge by heating and shearing an aqueous mixture of sewage sludge in a tubular-shaped processing means containing a plurality of rotating agitators to produce a pumpable aqueous slurry of sewage sludge. The aqueous slurry of sewage sludge is mixed with solid carbonaceous fuel or an aqueous slurry of solid carbonaceous fuel to produce a pumpable aqueous slurry of sewage sludge and solid carbonaceous fuel. The aqueous slurry of sewage sludge and solid carbonaceous fuel is heated in a first steam jacketed rotary disc mixing-heating means. Alternately, first and second hoppers are filled with said heated aqueous slurry of sewage sludge and solid carbonaceous fuel and cycled between a second steam jacketed rotary disc mixing-heating means; wherein while one hopper is being filled the contents in the other hopper are being dewatered. The thickened pumpable slurry is burned in a partial oxidation gasifier, furnace, boiler, or incinerator to produce a hot effluent gas steam. By this process, noxious sewage sludge may be disposed of without contaminating the environment. By-product synthesis gas, reducing gas, or fuel gas may be produced.

REFERENCES:
patent: 3687646 (1972-08-01), Brent et al.
patent: 4933086 (1990-06-01), McMahon et al.
patent: 4983296 (1991-01-01), McMahon et al.
patent: 5017196 (1991-05-01), Dewitz
patent: 5134944 (1992-08-01), Keller et al.

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