초록 ▼

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 wit

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 Low Btu gas is withdrawn from the acid phase digester while high Btu gas is withdrawn from the methane phase digester and may be upgraded for use as SNG.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.

대표청구항 ▼

A process for improved gas production by accelerated in situ bioleaching of organic waste landfills comprising: contacting said organic waste in a substantially sealed landfill in situ with an aqueous activated culture of hydrolytic and liquefying anaerobic microorganisms under growth conditions to

A process for improved gas production by accelerated in situ bioleaching of organic waste landfills comprising: contacting said organic waste in a substantially sealed landfill in situ with an aqueous activated culture of hydrolytic and liquefying anaerobic microorganisms under growth conditions to produce a bioleachate of hydrolysis and liquefaction products of microbial action of said microorganisms with said organic waste and to produce deactivated hydrolytic and liquefying anaerobic microorganisms; passing said bioleachate and deactivated microorganisms from said landfill to an acid phase digester operated at mesophilic or thermophilic conditions to regenerate said activated culture of hydrolytic and liquefying anaerobic microorganisms; passing the supernatant from said acid phase digester to a methane phase digester operated at mesophilic or thermophilic conditions to produce gas rich in methane; recirculating a mixture of said activated culture of hydrolytic and liquefying anaerobic microorganisms from said acid phase digester and the supernatant from said methane phase digester to contacting organic waste in situ in said substantially sealed landfill; and withdrawing low Btu gas from said acid phase digester and high Btu gas from said methane phase digester.