title: Comparison of solid-state to liquid anaerobic digestion of lignocellulosic feedstocks for biogas production.
abstract: Lignocellulosic biomass feedstocks (switchgrass, corn stover, wheat straw, yard waste, leaves, waste paper, maple, and pine) were evaluated for methane production under liquid anaerobic digestion (L-AD) and solid-state anaerobic digestion (SS-AD). No significant difference in methane yield between L-AD and SS-AD, except for waste paper and pine, were found. However, the volumetric productivity was 2- to 7-fold greater in the SS-AD system compared with the L-AD system, except for paper. Methane yields from corn stover, wheat straw, and switchgrass were 2-5 times higher than those from yard waste, maple, and pine biomass. Waste paper had a methane yield of only 15 L/kg VS caused by souring during SS-AD due to organic overloading. Pine also had very low biogas yield of 17 L/kg VS, indicating the need for pretreatment prior to SS-AD. The findings of this study can guide future studies to improve the efficiency and stability of SS-AD of lignocellulosic biomass.
authors.affiliation: Department of Food, Agricultural, and Biological Engineering, The Ohio State University/Ohio Agricultural Research and Development Center, Wooster, OH 44691-4096, United States.
authors.forename: Dan
authors.initials: D
authors.lastname: Brown
authors.forename: Jian
authors.initials: J
authors.lastname: Shi
authors.forename: Yebo
authors.initials: Y
authors.lastname: Li
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D006868:Hydrolysis; D007700:Kinetics; D008031:Lignin / Q000378:metabolism*; D008697:Methane / Q000378:metabolism
chemical_list: D056804:Biofuels; C036909:lignocellulose; D008031:Lignin; D008697:Methane