title: Combined process for ethanol fermentation at high-solids loading and biogas digestion from unwashed steam-exploded corn stover.
abstract: A combined process was designed for the co-production of ethanol and methane from unwashed steam-exploded corn stover. A terminal ethanol titer of 69.8 g/kg mass weight (72.5%) was achieved when the fed-batch mode was performed at a final solids loading of 35.5% (w/w) dry matter (DM) content. The whole stillage from high-solids ethanol fermentation was directly transferred in a 3-L anaerobic digester. During 52-day single-stage digester operation, the methane productivity was 320 mL CH₄/g volatile solids (VS) with a maximum VS reduction efficiency of 55.3%. The calculated overall product yield was 197 g ethanol + 96 g methane/kg corn stover. This indicated that the combined process was able to improve overall content utilization and extract a greater yield of lignocellulosic biomass compared to ethanol fermentation alone.
authors.affiliation: College of Life Science, Capital Normal University, Beijing 100048, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Wang
authors.affiliation: College of Life Science, Capital Normal University, Beijing 100048, China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Lv
authors.affiliation: College of Life Science, Capital Normal University, Beijing 100048, China.
authors.forename: Jiliang
authors.initials: J
authors.lastname: Du
authors.affiliation: College of Life Science, Capital Normal University, Beijing 100048, China.
authors.forename: Chunling
authors.initials: C
authors.lastname: Mo
authors.affiliation: College of Life Science, Capital Normal University, Beijing 100048, China.
authors.forename: Xiushan
authors.initials: X
authors.lastname: Yang
authors.affiliation: College of Life Science, Capital Normal University, Beijing 100048, China. Electronic address: cnu_tianshen@sina.com.
authors.forename: Shen
authors.initials: S
authors.lastname: Tian
mesh_terms: D056804:Biofuels; D002849:Chromatography, Gas; D002851:Chromatography, High Pressure Liquid; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D008031:Lignin / Q000378:metabolism; D008697:Methane / Q000096:biosynthesis; D035261:Plant Components, Aerial / Q000737:chemistry*; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D014866:Waste Products / Q000032:analysis*; D003313:Zea mays / Q000737:chemistry*
chemical_list: D056804:Biofuels; D014866:Waste Products; C036909:lignocellulose; D000431:Ethanol; D008031:Lignin; D008697:Methane
keywords: Anaerobic digestion; Ethanol and methane co-production; High solids fed batch SSF; Mass balance