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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.)

Value-added soluble metabolite production from sugarcane vinasse within the carboxylate platform: An application of the anaerobic biorefinery beyond biogas production

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Author(s):
Eng Sanchez, Felipe [1] ; Tadeu Fuess, Lucas [1, 2] ; Soares Cavalcante, Guilherme [1] ; Angela Talarico Adorno, Maria [1] ; Zaiat, Marcelo [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Lab Proc Biol, Escola Engn Sao Carlos, LPB, EESC, USP, Av Joao Dagnone 1100, BR-13563120 S ao Carlos, SP - Brazil
[2] Univ Sao Paulo, Dept Engn Quim, Escola Politecn, DEQ, EP, USP, Av Prof Lineu Prestes 580, Bloco 18 Conjunto Quim, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: FUEL; v. 286, n. 1 FEB 15 2021.
Web of Science Citations: 1
Abstract

Currently, wastewater processing through anaerobic digestion can generate not only biofuels such as bio-hydrogen and methane, but also value-added soluble-phase intermediates (e.g. carboxylic acids), which have numerous applications. This study investigates the potential of using sugarcane vinasse, the main byproduct from ethanol production, as substrate in dark fermentation to recover soluble metabolites through the biorefinery approach. The impacts of temperature (30-60 degrees C) and initial pH (5.0-10.0) were initially assessed in batch tests using microbial consortia obtained from the natural fermentation of vinasse. The yield (401 mg-CODorganic acids g(-1)CODt(initial)) and productivity (653 mg-CODorganic acids L-1 d(-1)) of organic acids were maximized at alkaline/ mesophilic (pH = 8.8-10.0; 40 degrees C) conditions. Acetic-type fermentation prevailed at 30-40 degrees C, whilst butyrate was the primary metabolite at a higher temperature (60 degrees C). Further chain elongation-based experiments were conducted by adding ethanol and lactate as exogenous carbon sources in vinasse fermentation, also using vinasse-derived microbial consortia as the inoculum. Lactate was added as both chemical reactant and fermented cassava flour wastewater (fCFW). Ethanol addition was irrelevant to the acidogenic activity. Conversely, lactate addition directly increased the production of propionic, butyric, (iso)valeric, and caproic acids, with a pre-dominance of butyrate. Chain elongation was particularly favored when adding fCFW with pH adjusted to 7.0, boosting the generation of caproic acid from lactate and butyrate and (iso)valeric acid from acetate and propionate. These results highlight the potential for producing organic acids from vinasse as an alternative to gaseous fuels, expanding the suitability of dark fermentation targeting bioresource recovery from sugarcane. (AU)

FAPESP's process: 15/06246-7 - Biorefinery concept applied to biological wastewater treatment plants: environmental pollution control coupled with material and energy recovery
Grantee:Marcelo Zaiat
Support type: Research Projects - Thematic Grants
FAPESP's process: 17/00080-5 - Enhancement of energy production from sugarcane in first generation biorefineries: biodigestion as the core conversion step
Grantee:Lucas Tadeu Fuess
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 16/21478-4 - Valorization of vinasse from sugar-cane industry by anaerobic digestion: treatment, organic acids recovery and biohydrogen production
Grantee:Felipe Eng Sánchez
Support type: Scholarships in Brazil - Post-Doctorate