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Assessing straw digestate as feedstock for bioethanol production

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  • Stoumpou, Vasileia
  • Novakovic, Jelica
  • Kontogianni, Nikoleta
  • Barampouti, Elli Maria
  • Mai, Sofia
  • Moustakas, Kostantinos
  • Malamis, Dimitris
  • Loizidou, Maria

Abstract

Anaerobically digested agricultural waste, such as straw digestate, still consists of residual lignin and carbohydrates that may be utilised as substrate for sugars production and alcoholic fermentation. Chemical pretreatment combined with enzymatic hydrolysis was investigated as an alternative valorisation route for digestate. Acid pretreatment along with enzymatic hydrolysis was found to yield low sugars recoveries (2–39%), casting doubt on its suitability for ethanol production. In contrary, alkaline pretreatment and enzymatic hydrolysis is a better approach with elevated saccharification yields reaching up to 72%. Ethanol fermentation of alkaline pretreated digestate presented yields up to 65% consuming all the available glucose, implying that no inhibitory factors are present. Conclusively, according to the experimental results the perspective of a new integrated system is enforced. This system combines ethanol production with anaerobic digestion simultaneously producing energy in the form of ethanol and methane and improving the overall energy balance.

Suggested Citation

  • Stoumpou, Vasileia & Novakovic, Jelica & Kontogianni, Nikoleta & Barampouti, Elli Maria & Mai, Sofia & Moustakas, Kostantinos & Malamis, Dimitris & Loizidou, Maria, 2020. "Assessing straw digestate as feedstock for bioethanol production," Renewable Energy, Elsevier, vol. 153(C), pages 261-269.
    • Handle: RePEc:eee:renene:v:153:y:2020:i:c:p:261-269
    DOI: 10.1016/j.renene.2020.02.021
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    References listed on IDEAS

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    1. Vancov, T. & McIntosh, S., 2012. "Mild acid pretreatment and enzyme saccharification of Sorghum bicolor straw," Applied Energy, Elsevier, vol. 92(C), pages 421-428.
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