Integrated production of second-generation ethanol and biogas from sugarcane bagasse pretreated with ozone.
No Thumbnail Available
Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Considering the lignocellulosic biorefinery, the present work evaluated the energy potential related to biogas production from the
anaerobic digestion (both at one- and two-stage) of the main residues derived from sugarcane bagasse (SB) pretreatment with
ozone aiming its further use for 2G ethanol. The results showed that 2G ethanol production was maximized under mild ozonation
conditions (7.5 mgO3 gSB−1
), generating 30 L ethanol tonSB−1
, which corresponds to a revenue of 17 USD tonSB−1 with sale.
Despite not leading to profits, the use of electric energy generated through CHP system (by burning the biogas produced at two-
stage anaerobic digestion) covered the energy costs involved in SB ozonation. A combined pretreatment consisting of SB
ozonation followed by alkaline extraction (AE) provided the highest 2G ethanol production (66 L tonSB−1
) under the most
severe conditions (97.5 mgO3 gSB−1
), and resulted in 37 USD tonSB−1 with ethanol sale. Despite this, process sustainability was
only achieved when the anaerobic digestion of main residues was taken into account and the combined O3+AE was used under
the mildest SB ozonation. At these conditions, the surplus energy (~ 30 MW per harvest) had the potential to supply about
320,000 inhabitants during the crop harvest.
Description
Keywords
Ozonation, Alkaline extraction, Two-stage anaerobic digestion, Biorefinery
Citation
LIMA, D. R. S. Integrated production of second-generation ethanol and biogas from sugarcane bagasse pretreated with ozone. Biomass Conversion and Biorefinery, v. 12, p. 809–825, 2022. Disponível em: <https://link.springer.com/article/10.1007/s13399-020-01234-7>. Acesso em: 11 out. 2022.