Unraveling the influence of the COD/sulfate ratio on organic matter removal and methane production from the biodigestion of sugarcane vinasse

Autor(es)

Mazine Kiyuna, Luma Sayuri ; Fuess, Lucas Tadeu ; Zaiat, Marcelo

• Tipo de documento: Artigo Científico
• Fonte: Bioresource Technology; v. 232, p. 103-112, MAY 2017.
• Citações Web of Science: 24

Resumo

Throughout the sugarcane harvest, it is common for sulfate to accumulate in the vinasse of sugar and ethanol plants. However, little is known regarding the influence of sulfate on the anaerobic digestion (AD) of vinasse, which may lead to severe performance losses. This study assessed the influence of various COD/sulfate ratios (12.0, 10.0 and 7.5) on both COD removal and methane (CH4) production from sugarcane vinasse AD. Batch assays were conducted in thermophilic conditions. At a COD/sulfate ratio of 7.5, CH4 production was 35% lower compared with a ratio of 12.0, considering a diversion of approximately 13.6% of the electron flow to sulfidogenesis. The diversion of electrons to sulfidogenesis was negligible at COD/sulfate ratios higher than 25, considering the exponential increase in CH4 production. Organic matter degradation was not greatly affected by sulfidogenesis, with COD removal levels higher than 80%, regardless of the initial COD/sulfate ratio. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 14/19091-9 - Influência do sulfato na digestão anaeróbia da vinhaça de cana-de-açúcar: efeitos sobre a remoção de matéria orgânica e produção de metano
• Beneficiário: Luma Sayuri Mazine Kiyuna
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 12/15606-9 - Biodigestão anaeróbia termofílica de vinhaça em sistemas combinados do tipo acidogênico-metanogênico para potencialização da recuperação de bioenergia em biorrefinarias de cana-de-açúcar de primeira geração
• Beneficiário: Lucas Tadeu Fuess
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/15984-0 - Produção de bioenergia no tratamento de águas residuárias e adequação ambiental dos efluentes e resíduos gerados
• Beneficiário: Marcelo Zaiat
• Modalidade de apoio: Auxílio à Pesquisa - Temático