Biochemical butyrate production via dark fermentation as an energetically efficient alternative management approach for vinasse in sugarcane biorefineries

Autor(es)

Fuess, Lucas Tadeu ^[1] ; dos Santos, Graciete Mary ^[2] ; Delforno, Tiago Palladino ^[3] ; Moraes, Bruna de Souza ^[4] ; da Silva, Ariovaldo Jose ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo DEQ EP USP, Chem Engn Dept, Polytech Sch, Av Prof Lineu Prestes 580, Bloco 18, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Campinas FEAGRI Unicamp, Sch Agr Engn, Av Candido Rondon 501, BR-13083875 Campinas, SP - Brazil

^[3] Univ Campinas CPQBA Unicamp, Microbial Resources Div, Res Ctr Chem Biol & Agr, Av Alexandre Cazelatto 999, BR-13148218 Paulinia, SP - Brazil

^[4] Univ Campinas NIPE Unicamp, Interdisciplinary Ctr Energy Planning, Rua Cora Coralina 330, Cidade Univ, BR-13083896 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RENEWABLE ENERGY; v. 158, p. 3-12, OCT 2020.
• Citações Web of Science: 4

Resumo

This study investigated the application of dark fermentation to obtain value-added soluble metabolite products (SMP) from vinasse as a strategy to enhance the energy efficiency in sugarcane biorefineries. Batch tests comparing sucrose and vinasse as the substrates were conducted, providing data to both understand conversion pathways and measure the energetic implications of fermenting vinasse under controlled conditions. Two distinct inoculum pretreatment methods, namely, acid-thermal and thermal were also assessed. Overall, butyrate fermentation was the primary conversion pathway observed in vinasse acidogenesis, leading to butyric/isobutyric acid concentrations over 6.0 g L-1, irrespective of the inoculum pretreatment. Lactic and malic acids were the primary substrates, with the predominance of the lactate-to-butyrate fermentation, suggesting the establishment of a syntrophic relation between lactate-producing bacteria and clostridial populations. Considering energetic aspects, the enhanced butyrate production could lead to an energy recovery potential of 30.9-33.4 MW, outcompeting highly-efficient biohydrogen- (<1.0 MW) and methane-producing (25.5 MW) anaerobic systems, in order to increase sugar conversion efficiency by 7.8%. Although important technological aspects still require proper attention to cost-efficiently scale-up SMP recovery from fermented substrates, the energetic relevance of butyrate production from vinasse was proved, characterizing an efficient approach to enhance the energy performance of sugarcane biorefineries. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/09785-8 - Digestão anaeróbia de águas residuárias direcionada para a produção de butanol e etanol
• Beneficiário: Ariovaldo José da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 16/16438-3 - Produção de biogás em biorrefinarias de cana-de-açúcar integradas de 1ª e 2ª geração: aspectos fundamentais e operacionais do processo
• Beneficiário: Bruna de Souza Moraes
• Modalidade de apoio: Auxílio à Pesquisa - Regular