title: Combination of high solids loading pretreatment and ethanol fermentation of whole slurry of pretreated rice straw to obtain high ethanol titers and yields.
abstract: In cellulosic ethanol production using lignocellulose, an increase in biomass solids loading during the pretreatment process significantly affects the final ethanol titer and the production cost. In this study, pretreatment using rice straw at high solids loading (20% (w/v)) was evaluated, using maleic acid as a catalyst. After pretreatment at optimal conditions of 190°C, 20 min, and 0.2% or 5% (w/v) maleic acid, the highest enzymatic digestibility obtained was over 80%. Simultaneous saccharification and fermentation (SSF) of the whole slurry of pretreated rice straw in the presence of activated carbon to separate inhibitory compounds generated a high ethanol yield of 62.8%, based on the initial glucan in unpretreated rice straw. These findings suggest that high solids loading pretreatment using maleic acid and SSF of the whole slurry of pretreated rice straw can be combined to improve the process economics of ethanol production.
authors.affiliation: Department of Biotechnology, Graduate School, Korea University, Seoul 136-713, Republic of Korea.
authors.forename: Young Hoon
authors.initials: YH
authors.lastname: Jung
authors.affiliation: Department of Biotechnology, Graduate School, Korea University, Seoul 136-713, Republic of Korea.
authors.forename: Hyun Min
authors.initials: HM
authors.lastname: Park
authors.affiliation: Department of Biotechnology, Graduate School, Korea University, Seoul 136-713, Republic of Korea.
authors.forename: Dong Hyun
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea.
authors.forename: Yong-Cheol
authors.initials: YC
authors.lastname: Park
authors.affiliation: Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Republic of Korea.
authors.forename: Jin-Ho
authors.initials: JH
authors.lastname: Seo
authors.affiliation: Department of Biotechnology, Graduate School, Korea University, Seoul 136-713, Republic of Korea. Electronic address: khekim@korea.ac.kr.
authors.forename: Kyoung Heon
authors.initials: KH
authors.lastname: Kim
mesh_terms: D056804:Biofuels; D018533:Biomass; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D008031:Lignin / Q000737:chemistry / Q000378:metabolism; D012275:Oryza / Q000737:chemistry*
chemical_list: D056804:Biofuels; C036909:lignocellulose; D000431:Ethanol; D008031:Lignin
keywords: High solids loading; Lignocellulose; Maleic acid; Pretreatment; Whole slurry fermentation