Saccharification of starchy food waste through thermochemical and enzymatic pretreatment, towards enhanced bioethanol production via newly isolated non-conventional yeast strains

I. Ntaikou, M. Alexandropoulou, M. Kamilari, S.A. Alamri, Y.S. Moustafa, M. Hashem, G. Antonopoulou and G. Lyberatos

Energy, 2023, vol. 281, issue C

Abstract: A starchy food waste containing mainly cooked wasted rice (WR) was exploited for bioethanol production using novel yeast strains was investigated. Different pretreatment schemes of the waste at solids loading 10%–30% TS WR (w/v) i.e. enzymatic, thermochemical and combined thermochemical/enzymatic pretreatment, were evaluated aiming to the maximum liberation of fermentable carbohydrates and their subsequent bioconversion to ethanol. Fermentation tests of the whole pretreated slurries were initially performed with the yeasts strains that were identified as Kluyveromyces marxianus isolate V3-19,Pichia kudriavzevii strain YF1702 and K. marxianus strain TTG-428, and their fermentation efficiencies (FE) were comparatively assessed. It was shown that the combined pretreatment led to the maximum saccharification, whereas FEs were higher for K. marxianus, V3-19, exceeding 90% of the theoretical maximum. In the case of the highest organic loading of WR, though, up to 25% of soluble carbohydrates remained unexploitable after 72 h of fermentation, indicating that kinetic restrictions occurred in the process. Further experiments with the hydrolysates that were recovered after combined pretreatment, revealed that the removal of solids enhances the consumption of sugars and leads to complete uptake for the loading 20% TS WR (w/v).

Keywords: Bioethanol; Food wastes; Starch; Hydrolysis; Pichia kudriavzevii; Kluyveromyces marxianus (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544223016535
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:energy:v:281:y:2023:i:c:s0360544223016535

DOI: 10.1016/j.energy.2023.128259

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

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