Utilization of Sago Solid Waste for Bioethanol Production With Variation of Sago Solid Waste-Solvent Ratio and Pre-treatment Time

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Chairul C., Ridho M., Zultiniar Z., Hendra A.

9th International Conference on Sustainable Agriculture, Food, and Energy, SAFE 2022, İstanbul, Turkey, 17 October 2022, vol.1228 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 1228
  • Doi Number: 10.1088/1755-1315/1228/1/012034
  • City: İstanbul
  • Country: Turkey
  • Hacettepe University Affiliated: Yes


Sago solid waste is a lignocellulosic material that can be used as a raw material for making bioethanol. The lignin component of lignocellulose can slow saccharification by preventing cellulase enzymes from accessing cellulose. The pre-treatment stage is the first stage of the lignocellulose-to-bioethanol conversion process, and it is used to lower lignin levels in lignocellulose. Saccharification and fermentation are the next processes in turning lignocellulosic material to bioethanol. The pre-treatment stage was carried out in this study using a 10% NaOH solution at a 4 bar pressure reactor and a temperature of 140 °C, while the saccharification and fermentation stages were carried out simultaneously (SSF) using cellulase enzymes and yeast Saccharomyces cerevisiae at 30 °C and pH 5. The ratio of sago solid waste to NaOH solution and the period of the pre-treatment process were varied in the study. The sago solid waste to solvent ratios were 1:5, 1:6, and 1:7, with processing times beginning at 20 minutes, 30 minutes, and 40 minutes. The maximum lignin reduction results (60.11%) were obtained at a ratio of 1:7 and a pre-treatment time of 40 minutes, while the highest yield of sago solid waste mass (35.14%) was obtained at a ratio of 1:5 and a pre-treatment process duration of 20 minutes. The results of the initial treatment stage were then continued with SSF for 0 hours, 24 hours, 48 hours, and 72 hours with the highest bioethanol content of 12% at 72 hours.