BioEnergy Research

, Volume 6, Issue 1, pp 292–299

Ethanol Production from High-Solid SSCF of Alkaline-Pretreated Corncob Using Recombinant Zymomonas mobilis CP4

Authors

  • Rongxin Su
    • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and TechnologyTianjin University
  • Yuanyuan Ma
    • Biomass Conversion Laboratory of Tianjin University R&D Center for Petrochemical TechnologyTianjin University
  • Wei Qi
    • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and TechnologyTianjin University
  • Mingjia Zhang
    • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and TechnologyTianjin University
  • Fang Wang
    • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and TechnologyTianjin University
  • Ruoyu Du
    • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and TechnologyTianjin University
  • Jifeng Yang
    • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and TechnologyTianjin University
    • Biomass Conversion Laboratory of Tianjin University R&D Center for Petrochemical TechnologyTianjin University
    • State Key Laboratory of Chemical Engineering, School of Chemical Engineering and TechnologyTianjin University
Article

DOI: 10.1007/s12155-012-9256-5

Cite this article as:
Su, R., Ma, Y., Qi, W. et al. Bioenerg. Res. (2013) 6: 292. doi:10.1007/s12155-012-9256-5

Abstract

In this work, Zymomonas mobilis was genetically improved for pentose utilization to increase the final ethanol concentration. It showed good fermentation ability on both soluble sugar mixture and lignocellulose. Nearly all the glucose and xylose in sugar mixture can be consumed, corresponding to 86 % of theoretic ethanol yield. Simultaneous saccharification and co-fermentation (SSCF) of NaOH-pretreated corncob was then carried out in a high dry matter (DM) loading of 15–25 w/v%. At the DM loading of 15 %, the suitable operating conditions were determined, i.e., Z. mobilis loading of 0.30 g dry weight/L at 30 °C (pH 5.5), under which the ethanol concentration reached 49.2 g/L. Higher final ethanol concentrations were obtained when SSCF was operated at the fed-batch mode. Several amounts of substrate (1 % to 10 %) were added, and the highest final ethanol concentration (60.5 g/L) was obtained at 10 % DM addition.

Keywords

Simultaneous saccharification and co-fermentation Recombinant Zymomonas mobilis Corncob Bioethanol Xylose fermentation Lignocellulose Cellulose High solids

Supplementary material

12155_2012_9256_MOESM1_ESM.doc (34 kb)
ESM 1 (DOC 34 kb)

Copyright information

© Springer Science+Business Media, LLC 2012