Sugar production from bioenergy sorghum by using pilot scale continuous hydrothermal pretreatment combined with disk refining

Ming Hsun Cheng, Bruce S. Dien, D. K. Lee, Vijay Singh

Research output: Contribution to journalArticle


Chemical-free pretreatments are attracting increased interest because they generate less inhibitor in hydrolysates. In this study, pilot-scaled continuous hydrothermal (PCH) pretreatment followed by disk refining was evaluated and compared to laboratory-scale batch hot water (LHW) pretreatment. Bioenergy sorghum bagasse (BSB) was pretreated at 160–190 °C for 10 min with and without subsequent disk milling. Hydrothermal pretreatment and disk milling synergistically improved glucose and xylose release by 10–20% compared to hydrothermal pretreatment alone. Maximum yields of glucose and xylose of 82.55% and 70.78%, respectively were achieved, when BSB was pretreated at 190 °C and 180 °C followed by disk milling. LHW pretreated BSB had 5–15% higher sugar yields compared to PCH for all pretreatment conditions. The surface area improvement was also performed. PCH pretreatment combined with disk milling increased BSB surface area by 31.80–106.93%, which was greater than observed using LHW pretreatment.

Original languageEnglish (US)
Article number121663
JournalBioresource Technology
StatePublished - Oct 2019



  • Bioenergy sorghum
  • Disk milling
  • Pilot-scale continuous hydrothermal pretreatment
  • Sugar production
  • Surface area

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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