| Texto completo | |
| Autor(es): |
Dias, M. E. S.
;
Fuess, L. T.
;
Nogueira, E. W.
;
Tommaso, G.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | FUEL; v. 407, p. 17-pg., 2026-10-23. |
| Resumo | |
This study presents a novel and integrated approach to enhance methane production from spent coffee grounds (SCG) by using coffee processing wastewater (CPWw) as both a pretreatment catalyst and a liquid medium. Unlike conventional methods, this work utilizes the acidogenic fermentation-derived short-chain fatty acids (SCFAs) from CPWw to facilitate a thermochemical pretreatment of SCG, bypassing the need for synthetic organic chemicals. The process involved three main steps: (i) acidogenic fermentation of CPWw (either alone or with SCG) to produce SCFAs, (ii) thermal pretreatment of SCG using the fermented liquid as a diluted acid solution, and (iii) anaerobic digestion of the pretreated SCG. This integration of biological and thermal processes significantly reduced lignocellulosic recalcitrance and enhanced hydrolysis, leading to a 68 % increase in methane yield (380.93 NmL g- 1 SCG) compared to untreated SCG (226.75 NmL g- 1 SCG). Additionally, methane production rates rose by 57 %, from 15.39 +/- 0.81 NmL g- 1 SCG h- 1 for untreated SCG to 24.13 +/- 1.05 NmL g- 1 SCG h- 1 during co-digestion with CPWw. Microbial community analysis revealed key shifts, with an enrichment of cellulose- and hemicellulose-degrading genera (e.g., Hydrogenispora, Mesotoga, Longilinea) and a dominance of the methanogenic genus Methanosaeta. This study introduces a novel mechanism for enhancing methane production by leveraging naturally derived SCFAs from CPWw, offering a sustainable, cost-effective, and environmentally friendly solution for biogas production from coffee residues. (AU) | |
| Processo FAPESP: | 20/07737-2 - Pré-tratamentos hidrotérmico e químico de resíduos da produção de café solúvel acoplados à metanogênese |
| Beneficiário: | Maria Eduarda Simoes Dias |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 22/10615-1 - Consolidação do conceito de biorrefinaria aplicado ao tratamento biológico de águas residuárias e de resíduos sólidos |
| Beneficiário: | Marcelo Zaiat |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 21/15022-6 - Associação de pré-tratamentos e digestão anaeróbia para a valorização energética dos principais resíduos da cadeia produtiva do café |
| Beneficiário: | Giovana Tommaso |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |