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Development of a more efficient process for production of fuel ethanol from bamboo

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Abstract

A process for production of fuel ethanol from bamboo treated with concentrated sulfuric acid has been previously proposed. To improve efficiency of the process, we tested saccharification with 70 weight% (wt%) sulfuric acid, acid–sugar separation by ion exclusion, addition of nutrients to the ethanol fermentation, and bioconversion of xylose to xylitol. A high efficiency of both sugar recovery (82.5 %) and acid recovery (97.5 %) was achieved in the saccharification process and in the continuous acid–sugar separation using a modified anion exchange resin, respectively. Reduction of the amount of mineral salts added to the saccharified liquid after acid–sugar separation did not negatively affect performance of the continuous ethanol fermentation. The ethanol yield and productivity were 93.7 % and 6 g/l h, respectively, at 35 °C and pH 4.0. And the ethanol yield and productivity were almost the same even at pH 3.5. Moreover, the xylose remaining in the fermented mash was efficiently converted to xylitol in batch fermentation by Candida tropicalis strain 2.1776. These results demonstrate a more efficient process for the production of fuel ethanol from bamboo.

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Acknowledgements

The authors thank Prof. Akinori Jyo at Kumamoto University for supplying the modified anion exchange resin, DOWEX 1 × 4 SS. This work was supported financially by the Ministry of the Environment of Japan.

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Authors and Affiliations

  1. College of Architecture and Environment, Sichuan University, No.24 South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China

    Zhao-Yong Sun, Ting Wang, Yue-Qin Tang & Kenji Kida

  2. Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto City, Kumamoto, 860-8555, Japan

    Li Tan & Kenji Kida

Authors
  1. Zhao-Yong Sun
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  2. Ting Wang
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Correspondence to Kenji Kida.

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Sun, ZY., Wang, T., Tan, L. et al. Development of a more efficient process for production of fuel ethanol from bamboo. Bioprocess Biosyst Eng 38, 1033–1043 (2015). https://doi.org/10.1007/s00449-014-1345-8

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  • DOI: https://doi.org/10.1007/s00449-014-1345-8

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