Method for converting biomass to methane or ethanol
First Claim
1. A method for converting biomass-based ligno-cellulosic materials in a biotreatment process to produce at least one of a methanaceous fuel gas and ethanol, comprising:
- subjecting said biomass-based ligno-cellulosic materials to pyrolysis to produce (a) a pyroligneous acid wherein a substantial portion is comprised of wood alcohol and wood vinegar, (b) a pyrogas containing methane, carbon monoxide, hydrogen and water, and (c) pyrosolids including char, ash, and residual lignin-containing materials;
separating pyrosolids from said pyroligneous acid, and pyrogas; and
subjecting said pyroligneous acid to an anaerobic biological treatment step to produce at least one of a methane-bearing biogas and ethanol.
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Abstract
A method for enhancing the treatment of lignocellulose-containing materials by biotreatment wherein such lignocellulose-containing materials, normally resistant to biotreatment, are first subjected to a low-temperature, long-residence time pyrolysis at about 175° C. to about 325° C. for about 0.1 hour to about 2.0 hours, wherein a substantial portion of the incoming material is distilled into water-soluble compounds amenable to anaerobic biotreatment. Exemplary applications of the method include pyrolytic pre-treatment of wastewater sludges, cellulosic wastes, wood, peat, plant residues, low-grade coal, and the like to enhance methane gas production in anaerobic digestion and/or oxygen-limited or oxygen-starved fermentation to produce ethanol.
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Citations
16 Claims
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1. A method for converting biomass-based ligno-cellulosic materials in a biotreatment process to produce at least one of a methanaceous fuel gas and ethanol, comprising:
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subjecting said biomass-based ligno-cellulosic materials to pyrolysis to produce (a) a pyroligneous acid wherein a substantial portion is comprised of wood alcohol and wood vinegar, (b) a pyrogas containing methane, carbon monoxide, hydrogen and water, and (c) pyrosolids including char, ash, and residual lignin-containing materials; separating pyrosolids from said pyroligneous acid, and pyrogas; and subjecting said pyroligneous acid to an anaerobic biological treatment step to produce at least one of a methane-bearing biogas and ethanol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for treating lignocellulose—
- containing material, comprising the steps of;
introducing a first lignocellulose-containing material to an anaerobic biotreatment step in a digester wherein methanogenic microorganisms produce a methane-containing biogas and an aqueous stream containing residual biosolids; separating said biogas from said aqueous stream containing biosolids; dewatering said residual biosolids; subjecting said residual biosolids to pyrolysis to produce a pyrolysis product comprising a gas; mixing said gas into a stream drawn from said digester; and
,recycling said stream back to said digester. - View Dependent Claims (14, 15, 16)
- containing material, comprising the steps of;
Specification