title: Application of a slurry feeder to 1 and 3 stage continuous simultaneous saccharification and fermentation of dilute acid pretreated corn stover.
abstract: Continuous operation is often chosen for conceptual designs of biological processing of cellulosic biomass to ethanol to achieve higher volumetric productivities. Furthermore, continuous stirred tank reactors (CSTR) can handle higher solids concentrations than possible in batch mode due to broth thinning at partial conversion in a continuous fermentor. However, experience and literature data are very limited for continuous simultaneous saccharification and fermentation (cSSF) processes. In this work, a slurry feed system was developed and applied to a 3-stage bench-scale cSSF train to convert pretreated corn stover to ethanol and determine the effects of dilution rate and number of fermentation vessels on overall volumetric productivity. The highest productivity of 0.4gL(-1)h(-1) was achieved in a single cSSF vessel with an 8h residence time. Furthermore, productivity at identical total residence times was 12% higher for operation with 3 cSSF stages than for a single CSTR stage for pretreated corn stover.
authors.affiliation: University of California Riverside, Bourns College of Engineering, CE-CERT, Columbia Avenue, Riverside, CA 92507, United States.
authors.forename: Simone
authors.initials: S
authors.lastname: Brethauer
authors.affiliation: University of California Riverside, Bourns College of Engineering, CE-CERT, Columbia Avenue, Riverside, CA 92507, United States.
authors.forename: Michael H
authors.initials: MH
authors.lastname: Studer
authors.affiliation: University of California Riverside, Bourns College of Engineering, CE-CERT, Columbia Avenue, Riverside, CA 92507, United States. Electronic address: cewyman@engr.ucr.edu.
authors.forename: Charles E
authors.initials: CE
authors.lastname: Wyman
mesh_terms: D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D002851:Chromatography, High Pressure Liquid; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D006868:Hydrolysis; D007700:Kinetics; D008954:Models, Biological; D012441:Saccharomyces cerevisiae; D013213:Starch / Q000378:metabolism*; D003313:Zea mays / Q000737:chemistry / Q000378:metabolism*
chemical_list: D056804:Biofuels; D000431:Ethanol; D013213:Starch
keywords: Continuous fermentation; Dilute acid pretreatment; Ethanol; Lignocellulosic biomass; Simultaneous saccharification and fermentation (SSF)