| Texto completo | |
| Autor(es): |
Paulinetti, Ana Paula
;
Guerieri, Fernanda Furtunato
;
Augusto, Isabela Mehi Gaspari
;
Lazaro, Carolina Zampol
;
Albanez, Roberta
;
Lovato, Giovanna
;
Ratusznei, Suzana Maria
;
Rodriguesa, Jose Alberto Domingues
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Environmental Management; v. 370, p. 14-pg., 2024-10-03. |
| Resumo | |
One of the factors that has a direct impact on anaerobic digestion is the applied organic loading rate (OLRA). Increasing OLRA can boost methane production but can also cause process failure. As a result, establishing the appropriate OLRA for the procedure is critical. This study evaluated the effect of increasing the OLRA using soybean molasses in a thermophilic anaerobic reactor (R-Thermo), as well as the effect of feeding strategy and co-processing with okara. Furthermore, the performance versus stability trade-off between R-Thermo and mesophilic anaerobic digestion (R-Meso) was investigated. The increase of OLRA from 10 to 15 and 20 kg-COD/m(3)/d led to a decrease in COD removal efficiency (90, 86, and 75%), methane yield (12.0, 11.6, and 9.9 mol-CH4/kg-COD) and an increase in total volatile acids concentration (251, 456, and 1393 mg-HAc/L, respectively). At 15 kg-COD/m(3)/d, R-Meso performed similarly to R-Thermo, and at 20 kg-COD/m(3)/d, R-Meso outperformed (81% COD removal efficiency, 9.3 mol-CH4/kg-CODrem and 154.5 mol-CH4/m(3)/d). Temperature greatly influenced the distribution of metabolic pathways, as shown by thermodynamic and kinetic analyses, thus impacting bacterial diversity. At 55 degrees C, amongst the bacterial genera, Tepidiphilus stood out (>28.2%), followed by Acetomicrobium, Coprothermobacter and Candidatus_Caldatribacterium. The OLRA clearly impacted the archaeal community; Methanothermobacter (77.4%) was favored over Methanosarcina (14.8%). Under thermophilic temperature, it seems that syntrophic acetate oxidation (SAO) bacteria might have competed for substrate with acetoclastic methanogens, while in R-Meso microorganisms responsible for the initial steps of organic matter breakdown, such as members of the Firmicutes and Proteobacteria phyla (at least 67%), were dominant. In summary, R-Meso, characterized by a more uniform distribution of metabolic pathways, as well as a diverse and well-adapted microbial consortium, have exhibited enhanced stability and outperformed R-Thermo at high-loads. (AU) | |
| 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: | 22/05522-4 - Viabilidade operacional de um AnSBBR no tratamento de esgoto sanitário: remoção de diclofenaco e ibuprofeno |
| Beneficiário: | Ana Paula Paoli |
| 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: | 21/13810-7 - Produção de biocombustíveis pelo tratamento anaeróbio de melaço de soja em condições mesofílica e termofílica |
| Beneficiário: | Giovanna Lovato |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 21/13797-0 - Produção de Metano em AnSBBR Termofílico pelo Tratamento de Melaço de Soja |
| Beneficiário: | Fernanda Furtunato Guerieri |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |