title: Comparison of liquid hot water and alkaline pretreatments of giant reed for improved enzymatic digestibility and biogas energy production.
abstract: Liquid hot water (LHW) and alkaline pretreatments of giant reed biomass were compared in terms of digestibility, methane production, and cost-benefit efficiency for electricity generation via anaerobic digestion with a combined heat and power system. Compared to LHW pretreatment, alkaline pretreatment retained more of the dry matter in giant reed biomass solids due to less severe conditions. Under their optimal conditions, LHW pretreatment (190°C, 15min) and alkaline pretreatment (20g/L of NaOH, 24h) improved glucose yield from giant reed by more than 2-fold, while only the alkaline pretreatment significantly (p<0.05) increased cumulative methane yield (by 63%) over that of untreated biomass (217L/kgVS). LHW pretreatment obtained negative net electrical energy production due to high energy input. Alkaline pretreatment achieved 27% higher net electrical energy production than that of non-pretreatment (3859kJ/kg initial total solids), but alkaline liquor reuse is needed for improved net benefit.
authors.affiliation: Department of Food, Agricultural and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096, United States; Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Agricultural Ministry, Collaborative Innovation Center of Biomass Energy, Henan Agricultural University, Zhengzhou 450002, China.
authors.forename: Danping
authors.initials: D
authors.lastname: Jiang
authors.affiliation: Department of Food, Agricultural and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096, United States. Electronic address: ge.162@osu.edu.
authors.forename: Xumeng
authors.initials: X
authors.lastname: Ge
authors.affiliation: Key Laboratory of New Materials and Facilities for Rural Renewable Energy of Agricultural Ministry, Collaborative Innovation Center of Biomass Energy, Henan Agricultural University, Zhengzhou 450002, China.
authors.forename: Quanguo
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Food, Agricultural and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096, United States.
authors.forename: Yebo
authors.initials: Y
authors.lastname: Li
mesh_terms: D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D005947:Glucose; D006358:Hot Temperature; D008697:Methane; D006109:Poaceae / Q000737:chemistry* / Q000378:metabolism; D014867:Water
chemical_list: D056804:Biofuels; D014867:Water; D005947:Glucose; D008697:Methane
keywords: Alkaline pretreatment; Benefit-cost analysis; Giant reed; Liquid hot water; Methane yield