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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Fuess, Lucas Tadeu [1] ; dos Santos, Graciete Mary [2] ; Delforno, Tiago Palladino [3] ; Moraes, Bruna de Souza [4] ; da Silva, Ariovaldo Jose [2]
Total Authors: 5
[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
Total Affiliations: 4
Document type: Journal article
Source: RENEWABLE ENERGY; v. 158, p. 3-12, OCT 2020.
Web of Science Citations: 4

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)

FAPESP's process: 12/09785-8 - Anaerobic wastewater digestion directed to butanol and ethanol production
Grantee:Ariovaldo José da Silva
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 16/16438-3 - Biogas production in integrated 1st and 2nd generation sugarcane biorrefineries: fundamentals and operational aspects of the process
Grantee:Bruna de Souza Moraes
Support Opportunities: Regular Research Grants