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The effect of process parameters during the thermal-expansionary pretreatment of wheat straw on hydrolysate quality and on biogas yield

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  • Kratky, Lukas
  • Jirout, Tomas

Abstract

This paper was dedicated to evaluate the impact of thermal-expansionary pretreatment on the quality of hydrolysate and on biogas yield. An aqueous suspension containing 5% wt. of wheat straw was treated under process temperature 170–200 °C with residence time 0–60 min. It has been proven that the organic biomass loss of straw, the rate of disruptions in its microstructure, COD, glucose and acetic acid yields in the liquid phase of hydrolysate increased with an increasing process temperature and residence time, while acidity decreased. This technology has also significantly increased methane yield. A maximum increase of 41% was reached at process temperature 170 °C and residence time 20 min. Nevertheless, based on energy balance of the treatment, it was determined, that heat of regeneration is lower than heat needed to reach process temperature. An addition heat source must be therefore installed in the technology.

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  • Kratky, Lukas & Jirout, Tomas, 2015. "The effect of process parameters during the thermal-expansionary pretreatment of wheat straw on hydrolysate quality and on biogas yield," Renewable Energy, Elsevier, vol. 77(C), pages 250-258.
    • Handle: RePEc:eee:renene:v:77:y:2015:i:c:p:250-258
    DOI: 10.1016/j.renene.2014.12.026
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    References listed on IDEAS

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    1. Toor, Saqib Sohail & Rosendahl, Lasse & Rudolf, Andreas, 2011. "Hydrothermal liquefaction of biomass: A review of subcritical water technologies," Energy, Elsevier, vol. 36(5), pages 2328-2342.
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    Cited by:

    1. Kulbeik, Tim & Scherzinger, Marvin & Höfer, Isabel & Kaltschmitt, Martin, 2021. "Autoclave pre-treatment of foliage – Effects of temperature, residence time and water content on solid biofuel properties," Renewable Energy, Elsevier, vol. 171(C), pages 275-286.
    2. Mulka, Rafał & Szulczewski, Wiesław & Szlachta, Józef & Mulka, Mariusz, 2016. "Estimation of methane production for batch technology – A new approach," Renewable Energy, Elsevier, vol. 90(C), pages 440-449.
    3. Zhang, Quanguo & Hu, Jianjun & Lee, Duu-Jong, 2016. "Biogas from anaerobic digestion processes: Research updates," Renewable Energy, Elsevier, vol. 98(C), pages 108-119.
    4. Wang, Zhi-Wen & Zhu, Ming-Qiang & Li, Ming-Fei & Wei, Qin & Sun, Run-Cang, 2019. "Effects of hydrothermal treatment on enhancing enzymatic hydrolysis of rapeseed straw," Renewable Energy, Elsevier, vol. 134(C), pages 446-452.

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