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Optimized Sugar Extraction and Bioethanol Production from Lipid-extracted Sewage Sludge

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Abstract

In a previous study, we extracted lipids from raw sewage sludge having a lipid content of 13.1% and used it for biodiesel production. In this study, the residue, lipid-extracted sewage sludge (LESS), was used to obtain sugars for bioethanol production. The LESS was composed of 2.6% lipids, 8.9% carbohydrates, 52.2% proteins, 35.3% ash, and 1.0% moisture. To process the LESS, a conventional dilute acid treatment was used, and this was optimized statistically via central composite design. A sugar yield of 75.5% was obtained under the optimal conditions: 5.9% (v/v) sulfuric acid, 85 min, and 120°C. In addition, commercial dry yeast was used to produce bioethanol from the sugars obtained from the LESS, and 1.8 g/L of bioethanol was obtained from the 5.0 g/L of sugars in the LESS under optimal culture conditions.

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Acknowledgments

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2018R1D1A1B07051113). The authors greatly appreciate this support.

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Authors and Affiliations

  1. College of Multidisciplinary Sciences, King Mongkut’s University of Technology Thonburi, Bangkok, 10140, Thailand

    Pansuwan Supaporn

  2. Department of Biochemical Engineering, Gangneung-Wonju National University, Gangneung, 25457, Korea

    Sung Ho Yeom

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  1. Pansuwan Supaporn
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  2. Sung Ho Yeom
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Correspondence to Sung Ho Yeom.

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Supaporn, P., Yeom, S.H. Optimized Sugar Extraction and Bioethanol Production from Lipid-extracted Sewage Sludge. Biotechnol Bioproc E 27, 119–125 (2022). https://doi.org/10.1007/s12257-021-0142-x

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  • DOI: https://doi.org/10.1007/s12257-021-0142-x

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