Methane Production by Co-Digesting Vinasse and Whey in an AnSBBR: Effect of Mixture Ratio and Feed Strategy

The most common approach to deal with vinasse (sugarcane stillage) is fertigation, but this technique compromises soil structure and surrounding water bodies. A possible solution is to transport vinasse to local cheese whey producers and perform the co-digestion of these wastewaters together, reduci...

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Bibliographic Details
Published in:Applied biochemistry and biotechnology 2019-01, Vol.187 (1), p.28-46
Main Authors: Lovato, Giovanna, Albanez, Roberta, Triveloni, Marianne, Ratusznei, Suzana M., Rodrigues, José A. D.
Format: Article
Language:English
Subjects:
60 APPLIED LIFE SCIENCES
Alternative energy sources
Batch culture
Biochemistry
Biofilms
Biogas
Biomass
Bioreactors
Biotechnology
CHEESE
Chemical oxygen demand
Chemistry
Chemistry and Materials Science
Composition effects
DIGESTION
Efficiency
Energy recovery
Ethanol
Metabolism
METHANE
Methane - metabolism
Models, Biological
Organic loading
ORGANIC MATTER
Productivity
Reactors
Renewable energy
Saccharum - chemistry
Soil structure
Soil water
SOILS
STILLAGE
SUGAR CANE
Sugarcane
Vinasse
WASTE WATER
Waste Water - microbiology
WHEY
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Summary:The most common approach to deal with vinasse (sugarcane stillage) is fertigation, but this technique compromises soil structure and surrounding water bodies. A possible solution is to transport vinasse to local cheese whey producers and perform the co-digestion of these wastewaters together, reducing their organic load and generating bioenergy. Therefore, this study investigated the application of an AnSBBR (anaerobic sequencing batch biofilm reactor) operated in batch and fed-batch mode, co-digesting vinasse and whey at 30 °C. The effect of influent composition and feeding strategy was assessed. In all conditions, the system achieved high organic matter removal (approximately 83%). Increasing the percentage of vinasse from 0 to 100% in the influent resulted in a decrease in methane productivity (76.3 to 51.1 molCH 4 m −3 day −1 ) and yield (12.7 to 9.1 molCH 4 kgCOD −1 ), but fed-batch mode operation improved reactor performance (73.0 molCH 4 m −3 day −1 and 11.5 molCH 4 kgCOD −1 ). From the kinetic metabolic model, it was possible to infer that, at the best condition, methane is produced in a similar way from the acetoclastic and hydrogenotrophic routes. A scheme of four parallel reactors with a volume of 16,950 m 3 each was proposed in the scale-up estimation, with an energy recovery estimated in 28,745 MWh per month.
ISSN:0273-2289
1559-0291
DOI:10.1007/s12010-018-2802-7