| Texto completo | |
| Autor(es): |
Augusto, Isabela Mehi Gaspari
;
Tavares, Arthur Gregorio Barbosa
;
Zanone, Armando
;
Lazaro, Carolina Zampol
;
Albanez, Roberta
;
Rodrigues, Jose Alberto Domingues
;
Ratusznei, Suzana Maria
;
Lovato, Giovanna
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 13, n. 5, p. 14-pg., 2025-10-25. |
| Resumo | |
Glycerol, a major byproduct of biodiesel production, presents both an environmental challenge and an opportunity for renewable energy generation via biological routes. However, its use as a substrate for thermophilic dark anaerobic fermentation remains limited due to low hydrogen productivity. This study evaluated hydrogen production in a 3.0 L anaerobic bioreactor operated at thermophilic temperatures (45-60 degrees C) with varying glycerol concentrations (0-4.7 g/L). To overcome microbial washout observed under direct glycerol feeding, a gradual transition from whey to glycerol was implemented to promote microbial adaptation. Hydrogen production decreased with increasing glycerol concentrations (from 89.7 mmol-H2/L/d to 2.7 mmol-H2/L/d at 100 % glycerol). The main metabolites detected were acetic acid (122-392 mg/L) and 1,3-propanediol (281-1585 mg/L). The Haldane-Andrews model effectively characterized excess-substrate inhibition kinetics, providing critical inhibition constants for key microbial groups, with acetic and lactic acid producers identified as the most sensitive groups to glycerol. Temperature influenced microbial diversity, with moderate thermophilic conditions (45 degrees C) favoring a diverse consortium (including Thermoanaerobacterium, Clostridium sensu stricto and Oxobacter), while higher temperatures (60 degrees C) led to the dominance of Thermoanaerobacterium. These findings provide novel insights into inhibition mechanisms using glycerol as a substrate for dark fermentation, supporting the optimization of hydrogen production from agroindustrial residues under thermophilic conditions. (AU) | |
| Processo FAPESP: | 21/05637-3 - Produção de biohidrogênio por digestão anaeróbia de glicerina em condição termofílica: avaliação de possível inibição |
| Beneficiário: | Arthur Gregorio Barbosa Tavares |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 22/01425-4 - Produção de hidrogênio e metano em dois estágios pelo tratamento de resíduos do processamento da soja (melaço e okara) em condição termofílica e mesofílica |
| Beneficiário: | Isabela Mehi Gaspari Augusto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 19/25395-4 - Avaliação da Produção de Biohidrogênio em Condição Termofílica Pelo Tratamento do Resíduo do Processo de Produção de Biodiesel |
| Beneficiário: | Isabela Mehi Gaspari Augusto |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |