Waste-to-fuel technologies for the bioconversion of carrot discards into biobutanol

Juan C. López-Linares, Mónica Coca, Pedro E. Plaza, Susana Lucas and María Teresa García-Cubero

Renewable Energy, 2023, vol. 202, issue C, 362-369

Abstract: Carrot discard was evaluated as a raw material for acetone-butanol-ethanol (ABE) fermentation. Different strategies based on hydrothermal pretreatment and/or enzymatic hydrolysis were compared for biobutanol production from carrot discard pulp. In addition, the use of different types of enzymes and diverse enzyme mixtures were evaluated. In this way, total sugar recoveries of up to 76%, and butanol and ABE concentrations of 7.4 and 11.5 g/L, respectively (74 g butanol and 115 g ABE/kg carrot pulp), were achieved when the carrot discard pulp was enzymatically hydrolyzed, without pretreatment, using a mixture of enzymes of Cellic CTec2 and Viscozyme L at a dosage of 0.1 and 0.2 g/g, respectively. When a hydrothermal pretreatment was applied, a total sugar recovery of 88%, 6.9 g/L butanol and 10.1 g/L ABE (69 g butanol and 101 g ABE/kg carrot pulp) were attained using the same mixture of enzymes. In this way, no hydrothermal pretreatment would be necessary to produce ABE from carrot discard, which is very interesting for the profitability of the process. Furthermore, the carrot discard juice yielded 6.4 and 9 g/L butanol and ABE, respectively, showing that all the carrot discards could be used for ABE production.

Keywords: Carrot discard; Hydrothermal pretreatment; Enzymatic hydrolysis; Biofuels; Biobutanol; Clostridium beijerinckii (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148122017347
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:202:y:2023:i:c:p:362-369

DOI: 10.1016/j.renene.2022.11.093

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().