Gas: heating and illuminating – Processes – Fuel mixtures
Patent
1980-06-23
1982-04-06
Kratz, Peter F.
Gas: heating and illuminating
Processes
Fuel mixtures
48209, 210603, 210747, 210901, 210926, 405129, 435167, C02F 1104, C12P 502
Patent
active
043233678
ABSTRACT:
A process for improved gas production and accelerated stabilization of landfills by accelerated in situ bioleaching of organic wastes by acid forming bacteria in substantially sealed landfills, passing the leachate of hydrolysis and liquefaction products of microbial action of the microorganisms with the organic material to an acid phase digester to regenerate the activated culture of acid forming microorganisms for recirculation to the landfill, passing the supernatant from the acid phase digester to a methane phase digester operated under conditions to produce methane rich gas. The supernatant from the methane phase digester containing nutrients for the acid forming microorganisms and added sewage sludge or other desired nutrient materials are circulated through the landfill. Low Btu gas is withdrawn from the acid phase digester while high Btu gas is withdrawn from the methane phase digester and may be upgraded for use as SNG. The process of this invention is applicable to small as well as large organic waste landfills, provides simultaneous disposal of municipal solid waste and sewage sludge or other aqueous organic waste in a landfill which may be stabilized much more quickly than an uncontrolled landfill as presently utilized.
REFERENCES:
patent: 1286017 (1918-11-01), Jones
patent: 2572767 (1951-10-01), Schlenz
patent: 3705851 (1972-12-01), Brauer
patent: 3732697 (1973-05-01), Dickson
patent: 3846292 (1974-11-01), Lecompte
patent: 4022665 (1977-05-01), Ghosh et al.
"Methane Production, Recovery, and Utilization from Landfills", James et al., Symposium Papers on Energy from Biomass and Wastes, Wash., D.C., Aug. 1978, pp. 317-324.
"Recovery and Utilization of Methane Gas from a Sanitary Landfill . . . ", Stearns et al., Symposium Papers on Energy from Biomass and Wastes, Wash., D.C., Aug. 1978, pp. 325-343.
Anaerobic Digestion, I. The Microbiology of Anaerobic Digestion, Toerien et al., Water Research, vol. 3, pp. 385-416, Pergamen Press (1969).
Institute of Gas Technology
Kratz Peter F.
Speckman Thomas W.
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