Processing of sewage sludge for use as a fuel

Details Processing of sewage sludge for use as a fuel Processing of sewage sludge for use as a fuel

1992-09-01

1993-11-23

Kratz, Peter

Gas: heating and illuminating

Processes

Fuel mixtures

48197A, 48209, 48DIG7, 110346, 210758, 210770, 210774, C10J 346, C02F 1106

Patent

active

052640094

ABSTRACT:
A process for disposing of sanitary sewage sludge by producing a pumpable slurry of sewage sludge with or without solid carbonaceous fuel and burning said slurry as fuel in a partial oxidation gas generator, furnace, or boiler. The aqueous slurry of sewage sludge is concentrated by removing water by means of a conventional belt filter press, centrifuge, or hydroclone. The dewatered slurry of sewage sludge is preheated and sheared; hydrothermally treated; and its solids content increased. A chelating agent, for example an aminopolycarboxylic acid or a hydrocarboxylic acid is mixed with the aqueous slurry of sewage sludge during the preheating and shearing step and/or the step for increasing its solids content. By means of the subject process, the viscosity of the slurry of sewage sludge with or without solid carbonaceous fuel is reduced and coagulation is suppressed. A pumpable aqueous slurry of sewage sludge with or without solid carbonaceous fuel is produced and burned with a free-oxygen containing gas in a partial oxidation gasifier, furnace, boiler, or incinerator to produce a hot raw effluent gas stream. In a preferred embodiment, the effluent gas stream is cleaned and purified and non-contaminating ash and slag are separated. 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: 4762527 (1988-08-01), Beshore et al.
patent: 4810259 (1989-03-01), Bakitsky et al.
patent: 4933086 (1990-06-01), McMahon et al.
patent: 4983296 (1991-01-01), McMahon et al.
patent: 5188739 (1993-02-01), Khan et al.
patent: 5188741 (1993-02-01), Zang et al.
patent: 5211724 (1993-05-01), Khan et al.

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