Process for utilizing a pumpable fuel from highly dewatered sewage sludge

Patent · Tue Aug 10 04:00:00 EDT 1993

OSTI ID:6056175

Khan, M R

A process is described for disposing of sewage sludge comprising: (1) dewatering an aqueous slurry of sewage sludge having a solids content of at least about 3 wt. % to produce an aqueous slurry of sewage sludge having a solids content in the range of about 5 to 20 wt. %; (2) pressing and/or centrifuging the dewatered slurry of sewage sludge from (1) to produce amorphous sewage sludge having a solids content in the range of about 28 to 50 wt. %; (3) heating the amorphous sewage sludge from (2) in a closed pressure vessel at a temperature in the range of about 150 F to 510 F in the absence of air for a period in the range of about 3 seconds to 60 minutes and shearing the sewage sludge by a rotor/mixer operating at a speed in the range of about 15 to 100 rpm, thereby producing a pumpable slurry of sewage sludge having a viscosity in the range of about 400 to 1,500 centipoise when a measured at 200 F and a higher heating value in the range of about 5,000 to 9,500 Btu/lb, dry basis; and (4) burning said pumpable slurry from (3) in a partial oxidation gasifier, furnace, boiler, or incinerator to produce an effluent gas stream.

• Assignee: Texaco Inc., White Plains, NY (United States)
• Patent Number(s): A; US 5234468
• Application Number: PPN: US 7-722811
• OSTI ID: 6056175
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090900 -- Biomass Fuels-- Processing-- (1990-)
092000* -- Biomass Fuels-- Combustion-- (1990-)
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320604 -- Energy Conservation
Consumption
& Utilization-- Municipalities & Community Systems-- Municipal Waste Management-- (1980-)
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
BOILERS
CALORIFIC VALUE
CENTRIFUGATION
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION PROPERTIES
CONCENTRATION RATIO
FABRICATION
FURNACES
GAS GENERATORS
HEAT TREATMENTS
INCINERATORS
MATERIALS
MATERIALS WORKING
MIXING
OXIDATION
PRESSING
REMOVAL
SEPARATION PROCESSES
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOLIDS
THERMOCHEMICAL PROCESSES
VISCOSITY
WASTES
WATER REMOVAL