New approach to agro-industrial solid and liquid waste management: Performance of an EGSB reactor at different hydraulic retention times for methane production

Autor(es)

Rodrigues, Caroline Varella ; de Oliveira Filho, Leonardo Matias ; Camargo, Franciele Pereira ; Dornelles, Henrique de Souza ; Sakamoto, Isabel Kimiko ; Maintinguer, Sandra Imaculada ; Silva, Edson Luiz ; Varesche, Maria Bernadete Amancio

• Tipo de documento: Artigo Científico
• Fonte: RENEWABLE ENERGY; v. 237, p. 13-pg., 2024-12-01.

Resumo

This study investigated the removal of agro-industrial wastes (5 g COD L-1 from coffee and 0.5 g COD L-1 from brewery wastewater, plus 1 g L-1 of coffee pulp and husk) in a continuous Expanded Granular Sludge Bed (EGSB) reactor at 35 degrees C. The effect of Hydraulic Retention Times (HRTs) of 72h, 48h, and 24h on CH4 yield was examined using a mixed culture of cattle manure and granular sludge. Methane yields were 201, 124.5, and 113.8 mL CH4 g-1 COD for the 1st, 2nd, and 3rd phases, respectively. Volatile fatty acids, particularly acetic acid, increased at lower HRTs. Sequencing of the 16S rRNA gene on the Illumina HiSeq platform revealed a syntrophic relationship between Syntrophorhabdus, Syntrophobacter, and Pseudomonas with methanogens Methanomassiliicoccus, Methanospirillum, and Methanobacterium, aiding in the removal of phenolic compounds. The study suggests that an HRT of 72h is optimal for maximizing CH4 production in the EGSB reactor. (AU)

• Processo FAPESP: 15/06246-7 - Aplicação do conceito de biorrefinaria a estações de tratamento biológico de águas residuárias: o controle da poluição ambiental aliado à recuperação de matéria e energia
• Beneficiário: Marcelo Zaiat
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 20/15988-5 - Biorrefinaria aplicada à gestão de resíduos do processamento do café codigeridos em resíduos industriais para a geração de biogás
• Beneficiário: Caroline Varella Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado