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KMID : 1094720220270010119
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Biotechnology and Bioprocess Engineering
2022 Volume.27 No. 1 p.119 ~ p.125
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Optimized Sugar Extraction and Bioethanol Production from Lipid-extracted Sewage Sludge
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Supaporn Pansuwan
Yeom Sung-Ho
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Abstract
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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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KEYWORD
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optimization, lipid-extracted sewage sludge, sugar extraction, dilute acid treatment, bioethanol
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