The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1993
Filed:
Jun. 28, 1991
Motasimur R Khan, Wappingers Falls, NY (US);
Matthew A McMahon, Wappingers Falls, NY (US);
Christine C Albert, Peekskill, NY (US);
Ronald J McKeon, Beacon, NY (US);
Stephen J DeCanio, Montgomery, NY (US);
Texaco Inc., White Plains, NY (US);
Abstract
A process for disposing of sewage sludge comprising the steps of, (1) dewatering the sewage sludge to produce an aqueous slurry of sewage sludge having a solids content of about 10 to 50 wt. %; (2) heating and mildly shearing said dewatered sewage sludge at about 150.degree. F. to 210.degree. F. in the absence of air for 3 seconds to 60 minutes by a rotor/mixer at a speed of about 15 to 1000 r.p.m., thereby producing a pumpable slurry having a viscosity of less than about 2500 centipoise; (3) mixing at a temperature in the range of about ambient to 200.degree. F. the slurry of sewage sludge from (2) with a supplemental fuel to produce a pumpable slurry of sewage sludge and supplemental fuel having a solids content in the range of about 50 to 65 wt. % and a higher heating value in the range of about 6,000 to 18,000 BTU/LB; and (4) burning said pumpable slurry from (3) in a partial oxidation gasifier, furnace, boiler, or incinerator to produce an 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.