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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.)

Dynamics of sulfate reduction in the thermophilic dark fermentation of sugarcane vinasse: A biohydrogen-independent approach targeting enhanced bioenergy production

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Piffer, Michael Antonio [1] ; Zaiat, Marcelo [1] ; do Nascimento, Claudio Augusto Oller [2] ; Fuess, Lucas Tadeu [2, 1]
Total Authors: 4
[1] Univ Sao Paulo, Sao Carlos Sch Engn, Biol Proc Lab, EESC, USP, Av Joao Dagnone 1100, BR-13563120 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Polytech Sch, Chem Engn Dept, Av Prof Lineu Prestes 580, Bloco 18, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

Dark fermentation (DF) systems usually exploit bioH(2) production aiming to improve the energetic potential (EP) of anaerobic digestion (AD) schemes. In the case of sulfate-rich substrates, the versatility of fermentative consortia may favor the establishment of sulfidogenic conditions, minimizing/eliminating the competition between sulfate-reducing bacteria (SRB) and methanogens in the sequential stage and providing sulfide-free biogas. This study details the establishment of sulfidogenesis on the thermophilic DF of sugarcane vinasse in a continuous polyurethane-filled fixed-film reactor, also estimating the EP for vinasses according to different AD-related approaches. High sodium levels naturally stimulated SRB by maintaining high pH values (> 6.0), whilst NaHCO3 dosing was required when natural buffering conditions were not maintained. High acetate (similar to 3 g-COD L-1) and COD/sulfate ratio (> 25.0) levels indicated a high-quality substrate for further methanogenesis. High butyrate concentrations (similar to 11 g-COD L-1) coupled to caproate detection indicated the occurrence of chain elongation processes, leading to low bioH(2) production levels (<400 NmL-H(2)L(-1)d(-1)). However, estimates indicated 12.2%-and 51.7%-increases in the methane-based EP (MJ m(-3)) of sulfate-free fermented vinasse (216.72) relative to sulfate-rich fermented (193.10) and fresh (142.88) vinasses. Hence, the ultimate approach for maximizing bioenergy production from sugarcane vinasse is detailed in this study. (AU)

FAPESP's process: 15/50684-9 - Sustainable gas pathways for Brazil: from microcosm to macrocosm
Grantee:Reinaldo Giudici
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support type: Research Grants - Research Centers in Engineering Program
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: 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