Journal
BIORESOURCE TECHNOLOGY
Volume 243, Issue -, Pages 464-473Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.06.143
Keywords
Agro-industrial waste; Pretreatment; Butanol; Energy consumption; Energy efficiency; NER
Funding
- European Union's Horizon research and innovation program [654623]
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Waste lettuce leaves - from the fresh cut vegetable industry - were pretreated with the deep eutectic solvent (DES) made of choline chloride - glycerol. Reaction time (3-16 h) and the operation temperature (80-150 degrees C) were investigated. Enzymatic glucose and xylose yields of 94.9% and 75.0%, respectively were obtained when the biomass was pretreated at 150 degrees C for 16 h. Sugars contained in the biomass hydrolysate were fermented in batch cultures of Clostridium acetobutylicum DSMZ 792. The energy consumption and the energy efficiency related to the DES pretreatment were calculated and compared to the most common lignocellulosic pretreatment processes reported in the literature. The DES pretreatment process was characterized by lower energy required (about 28% decrease and 72% decrease) than the NAOH pretreatment and steam explosion process respectively. The Net Energy Ratio (NER) value related to butanol production via DES biomass pretreatment was assessed. (C) 2017 Elsevier Ltd. All rights reserved.
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