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.
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Data availability
The authors declare that all data supporting the findings of this study are available within the article, including the supplementary information files.
Abbreviations
- AD:
-
Anaerobic digestion
- AE:
-
Alkaline extraction
- CP:
-
Central point
- EC:
-
Enzymatic conversion
- LB:
-
Lignocellulosic biomass
- LF:
-
Liquid fractions, from enzymatic hydrolysis of SF
- LR:
-
Lignin removal
- LSR:
-
Liquid-to-solid ratio
- RLF:
-
Residual liquid fraction from alkaline extraction of SB pretreated with O3
- SB:
-
Sugarcane bagasse
- SF:
-
Solid fractions, from SB pretreatment
- SS-1S-AD:
-
Single-stage anaerobic digestion at solid state
- SS-2S-AD:
-
Two-stage anaerobic digestion at solid state
- USF:
-
Unhydrolyzed solid fractions, from enzymatic hydrolysis of SF
- YEtOH:
-
Ethanol yield
- 1S-AD:
-
Single-stage anaerobic digestion
- 2S-AD:
-
Two-stage anaerobic digestion.
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Funding
This work was supported by the Coordination for the Improvement of Higher Education Personnel - CAPES (Finance Code 001); Brazilian National Council for Scientific and Technological Development (CNPq – grant numbers: 308978/2017-0; 152180/2019-2; 307445/2019-4); and Minas Gerais State Research Funding Agency (FAPEMIG – grant number: TEC-APQ-03502-16).
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Diego R S Lima: investigation, methodology, resources, formal analysis; Aline G O Paranhos: writing – original draft; Oscar F H Adarme: formal analysis; Software; Bruno E L Baêta: resources, supervision, writing – review and editing; Leandro V A Gurgel: resources, supervision, writing – review and editing, funding acquisition; Alexandre S Santos: writing – review and editing, visualization; Silvana Q Silva: writing - review and editing, resources, funding acquisition; Sérgio F Aquino: conceptualization, writing - review and editing, project administration, funding acquisition.
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Lima, D.R.S., de Oliveira Paranhos, A.G., Adarme, O.F.H. et al. Integrated production of second-generation ethanol and biogas from sugarcane bagasse pretreated with ozone. Biomass Conv. Bioref. 12, 809–825 (2022). https://doi.org/10.1007/s13399-020-01234-7
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DOI: https://doi.org/10.1007/s13399-020-01234-7