Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 26, Pages 9822-9832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c02529
Keywords
Food waste; Acetone-butanol-ethanol; Fermentation; Energy recovery; Clostridium; Cell immobilization
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Funding
- National Science Foundation through an NSF Phase I STTR grant [1746784]
- USDA Hatch Program of the National Institute of Food and Agriculture (NIFA)
- Virginia Agricultural Experiment Station
- Directorate For Engineering [1746784] Funding Source: National Science Foundation
- Div Of Industrial Innovation & Partnersh [1746784] Funding Source: National Science Foundation
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Sustainable and economical production of butanol via acetone-butanol-ethanol (ABE) fermentation faces several major challenges, including high feedstock cost, low butanol yield, and low butanol productivity. To address these challenges, low-cost food waste was used as feedstock for ABE production in batch and continuous immobilized-cell fermentation by a recombinant high-butanol production strain Clostridium saccharoperbutylacetonicum deltptabuk. Food waste was first liquefied and saccharified to obtain fermentable sugars. After that, food waste hydrolysates were fed into both batch and continuous immobilized-cell fermentation systems to produce ABE. In the batch fermentation, only 14.32 g/L ABE was produced using food waste hydrolysates medium. However, when food waste hydrolysate medium was fed into the continuous immobilized-cell fermentation, remarkable increases of ABE production, yield, and productivity were achieved. At the dilution rate of 0.1 h(-1), 19.65 g/L ABE was produced with an ABE yield of 0.43. At the dilution rate of 0.39 h(-1), the highest ABE productivity (4.56 g/L/h) was obtained, which was 23 times higher than that in the batch fermentation. This study for the first time demonstrated efficient conversion of food waste to butanol via continuous immobilized-cell fermentation to achieve high titer and productivity, which would potentially support the advanced utilization of organic waste materials for biofuel production.
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