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Subcritical water hydrolysis of grape pomace as a sustainable pretreatment for anaerobic digestion in a biorefinery concept

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Author(s):
Castro, Luiz Eduardo Nochi ; Barroso, Tiago Linhares Cruz Tabosa ; Sganzerla, William Gustavo ; Costa, Josiel Martins ; Saia, Flavia Talarico ; Colpini, Leda Maria Saragiotto ; Forster-Carneiro, Tania
Total Authors: 7
Document type: Journal article
Source: FUEL; v. 363, p. 15-pg., 2024-01-19.
Abstract

This study presented a sustainable bioprocess based on the integration between subcritical water hydrolysis (SWH) and anaerobic digestion (AD) for the valorization of grape pomace (Vitis vinifera L.) in a biorefinery concept. The hydrolysate obtained by SWH (150 C, 150 bar, 10 mL min- 1, and solvent-to-feed ratio of 30 g water g(-1) grape pomace) was composed by glucose (0.37 g kg(- 1)), arabinose (0.25 g kg(- 1)), fructose (1.87 g kg(- 1)), and cellobiose (0.62 g kg(- 1)) as major sugars, demonstrating the rupture of the carbohydrates in the biomass and release of monosaccharides from the structure. The application of grape pomace hydrolysate obtained by SWH in AD process increased the methane yield (256.88 L CH4 kg(- 1) TVS) when compared with the AD without pretreatment (35.74 L CH4 kg(-1) TVS) after 40 days of experiment. The biogas produced in the process integrating SWH and AD (42.76 L kg(- 1) grape pomace) can be converted into electricity (72.33 kWh t(-1)) and heat (390.17 MJ t(-1)), mitigating greenhouse gases emissions (27.27 kg CO2-eq t(- 1)) and contributing for the development of a sustainable industry. The pretreatment favored the development of a stable and diverse microbial community, highlighting the presence of Clostridia, Lachnospiraceae and Trichococcus. The digestate generated after fermentation presented an IC50 of 8.8 g/L under lettuce germination, demonstrating that could be applied as biofertilizer in agriculture. In conclusion, the novel bioprocess integrating SWH and AD can be a promising alternative for the valorization of grape pomace in a biorefinery concept, producing biomethane, bioenergy, and biofertilizer from a by-product generated worldwide. (AU)

FAPESP's process: 19/26925-7 - Development of an automated system for biofuel precursor production using sub-critical technology
Grantee:William Gustavo Sganzerla
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 21/03950-6 - Subcritical hydrolysis and anaerobic digestion for the production of sugars and biogas from apple pomace from juice processing
Grantee:Josiel Martins Costa
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 18/14938-4 - Waste2energy: integration of supercritical technologies and anaerobic digestion through an automated system for the production of biofuel precursors
Grantee:Tânia Forster Carneiro
Support Opportunities: Research Grants - Young Investigators Grants - Phase 2
FAPESP's process: 21/04096-9 - Integration of the extraction/hydrolysis processes in subcritical water and purification for the valuation of grape bagasse in a biorrefinery concept
Grantee:Luiz Eduardo Nochi de Castro
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 20/16248-5 - Purification of jabuticaba waste extracts by adsorbents and biochar using supercritical technology
Grantee:Tiago Linhares Cruz Tabosa Barroso
Support Opportunities: Scholarships in Brazil - Master