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Bioethanol production using the sequential acid/alkali-pretreated empty palm fruit bunch fiber

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  • Kim, Seonghun
  • Kim, Chul Ho

Abstract

Empty palm fruit bunch (EPFB) contains a rigid and ordered fiber structure within a relatively high level of hemicellulose and lignin. To enhance poorly enzymatic digestibility and fermentability, in this a sequential acid/alkali pretreatment strategy was applied to increase the fermentable sugar in EPFB fiber. Cellulose content in the biomass was effectively increased by using dilute sulfuric acid treatment to eliminate hemicellulose followed by highly concentrated sodium hydroxide treatment for delignification. The pretreated biomass consisted of 85.2 ± 1.9% cellulose, 1.8 ± 0.5% hemicellulose, and 9.2 ± 0.3% lignin. Under optimal conditions for enzymatic saccharification, 10% (w/v) of pretreated EPFB fiber was hydrolyzed completely and converted to 70.8 ± 0.8 g/L glucose and 1.8 ± 0.1 g/L xylose with a 83.9% yield efficiency. Simultaneous saccharification and fermentation of the pretreated biomass by Saccharomyces cerevisiae W303-1A produced 37.8 g/L ethanol in 1.5 L fermented medium containing 10% (w/v) pretreated EPFB fiber after 60 h. The ethanol productivity was 0.378 g ethanol/g dry EPFB fiber and 0.45 g ethanol/g glucose after fermentation, with a low concentration of xylose and organic acid metabolites. Also, 88% of fermentable sugar was used by the yeast for ethanol fermentation. These results indicate that sequential acid/alkali pretreatment increased enzymatic digestibility and ethanol productivity.

Suggested Citation

  • Kim, Seonghun & Kim, Chul Ho, 2013. "Bioethanol production using the sequential acid/alkali-pretreated empty palm fruit bunch fiber," Renewable Energy, Elsevier, vol. 54(C), pages 150-155.
    • Handle: RePEc:eee:renene:v:54:y:2013:i:c:p:150-155
    DOI: 10.1016/j.renene.2012.08.032
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    Citations

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    Cited by:

    1. Pulidindi, Indra Neel & Kimchi, Baruchi B. & Gedanken, Aharon, 2014. "Can cellulose be a sustainable feedstock for bioethanol production?," Renewable Energy, Elsevier, vol. 71(C), pages 77-80.
    2. Akhtar, Junaid & Idris, Ani, 2017. "Oil palm empty fruit bunches a promising substrate for succinic acid production via simultaneous saccharification and fermentation," Renewable Energy, Elsevier, vol. 114(PB), pages 917-923.
    3. Kim, Seonghun & Kim, Chul Ho, 2014. "Evaluation of whole Jerusalem artichoke (Helianthus tuberosus L.) for consolidated bioprocessing ethanol production," Renewable Energy, Elsevier, vol. 65(C), pages 83-91.
    4. Do, Truong Xuan & Lim, Young-il, 2016. "Techno-economic comparison of three energy conversion pathways from empty fruit bunches," Renewable Energy, Elsevier, vol. 90(C), pages 307-318.
    5. Derman, Eryati & Abdulla, Rahmath & Marbawi, Hartinie & Sabullah, Mohd Khalizan, 2018. "Oil palm empty fruit bunches as a promising feedstock for bioethanol production in Malaysia," Renewable Energy, Elsevier, vol. 129(PA), pages 285-298.
    6. Romaní, Aloia & Ruiz, Héctor A. & Teixeira, José A. & Domingues, Lucília, 2016. "Valorization of Eucalyptus wood by glycerol-organosolv pretreatment within the biorefinery concept: An integrated and intensified approach," Renewable Energy, Elsevier, vol. 95(C), pages 1-9.
    7. Xu, Jikun & Hou, Huijie & Hu, Jingping & Liu, Bingchuan, 2018. "Coupling of hydrothermal and ionic liquid pretreatments for sequential biorefinery of Tamarix austromongolica," Applied Energy, Elsevier, vol. 229(C), pages 745-755.
    8. Thangavelu, Saravana Kannan & Ahmed, Abu Saleh & Ani, Farid Nasir, 2016. "Review on bioethanol as alternative fuel for spark ignition engines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 820-835.
    9. Kim, Seonghun & Kim, Sang-Dae & Sohn, Seok Young, 2020. "Evaluation of the wastewater generated during alkaline pretreatment of biomass for feasibility of recycling and reusing," Renewable Energy, Elsevier, vol. 155(C), pages 1156-1164.
    10. Arora, Richa & Behera, Shuvashish & Kumar, Sachin, 2015. "Bioprospecting thermophilic/thermotolerant microbes for production of lignocellulosic ethanol: A future perspective," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 699-717.
    11. Suhartini, Sri & Rohma, Novita Ainur & Mardawati, Efri & Kasbawati, & Hidayat, Nur & Melville, Lynsey, 2022. "Biorefining of oil palm empty fruit bunches for bioethanol and xylitol production in Indonesia: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 154(C).

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