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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.)

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

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Mazine Kiyuna, Luma Sayuri ; Fuess, Lucas Tadeu ; Zaiat, Marcelo
Total Authors: 3
Document type: Journal article
Source: Bioresource Technology; v. 232, p. 103-112, MAY 2017.
Web of Science Citations: 24

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)

FAPESP's process: 14/19091-9 - Influence of sulfate on the anaerobic digestion of sugarcane vinasse: effects on the organic matter removal and methane production
Grantee:Luma Sayuri Mazine Kiyuna
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 09/15984-0 - Bioenergy production from wastewaters and environmental fitting of liquid and solid wastes generated
Grantee:Marcelo Zaiat
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/15606-9 - Thermophilic anaerobic biodigestion of vinasse in combined acidogenic-methanogenic systems to enhance bioenergy recovery in first generation sugarcane biorefineries
Grantee:Lucas Tadeu Fuess
Support type: Scholarships in Brazil - Doctorate