Bioethanol Production from Marine Macroalgae Waste: Optimisation of Thermal acid Hydrolysis

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Pardilhó, S (Author) FEUP; Oliveira, J (Author) Other; Pires, JCM (Author) FEUP; Maia Dias, J (Author) Other

Journal

Title: Waste and Biomass Valorization

ISSN: 1877-2641

Publisher: Springer Nature

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-00Z-XTB

DOI: 10.1007/s12649-023-02320-3

Abstract (EN): Marine macroalgae waste, resulting from the accumulation of drifted algal biomass along the coastline, might be a relevant complementary raw material aiming sustainable bioethanol production. In the present study, the optimisation of thermal acid hydrolysis was performed using response surface methodology (RSM) considering the effect of three variables, namely, reaction time (10¿60 min), acid concentration (0.1¿2.5% (v/v) H2SO4) and biomass:acid ratio (5¿15% (w/v)) on sugar concentration and yield. Under the best conditions, the resulting hydrolysates were fermented (7 days, 30 °C, 150 rpm, commercial yeast) to produce bioethanol. A statistically valid second-order model was obtained (r 2 = 0.9876; Prob > F lower than 0.05), showing that sugar concentration is mostly influenced by the biomass:acid ratio while reaction time was not significant. The maximum predicted sugar concentration was 18.4 g/L, being obtained at 2.5% H2SO4 concentration and 15% (w/v) biomass:acid ratio, corresponding to a sugars yield of 12.5 g/100 g (less 36% than that obtained using 10% (w/v)). At the best conditions, the hydrolysates were fermented to obtain a bioethanol concentration up to 2.4 g/L and a 21 mgbioethanol/gbiomass yield, emphasizing the biomass potential for bioenergy production. Graphical Abstract: [Figure not available: see fulltext.] © 2024, The Author(s).

Language: English

Type (Professor's evaluation): Scientific