Different ratios of carbon sources in the fermentation of cheese whey and glucose as substrates for hydrogen and ethanol production in continuous reactors |
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Authors: | Paula Rúbia Ferreira Rosa Samantha Christine Santos Edson Luiz Silva |
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Affiliation: | 1. Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235, 13565-905 São Carlos, São Paulo, Brazil;2. Department of Hydraulics and Sanitation, School of Engineering of São Carlos, University of São Paulo, Av. Trabalhador São-carlense, 400, 13566-590 São Carlos, São Paulo, Brazil |
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Abstract: | The fermentation of glucose, cheese whey and the mixture of glucose and cheese whey were evaluated in this study from two inocula sources (sludge from a UASB reactor for swine wastewater treatment and poultry slaughterhouse) for hydrogen production in continuous anaerobic fluidized bed reactors (AFBR). For all fermentations, a hydraulic retention time (HRT) of 6 h and a substrate concentration of 5 g COD L−1 were used. In glucose fermentation, the maximum hydrogen yield (HY) was 1.37 mmol H2 g−1 COD. The co-fermentation of the cheese whey and glucose mixture was favorable for the concomitant production of hydrogen and ethanol, with yields of up to 1.7 mmol H2 g−1 COD and 3.45 mol EtOH g−1 COD in AFBR2. The utilization of cheese whey as a sole substrate resulted in an HY of 1.9 mmol H2 g−1 COD. Throughout the study, ethanol fermentation was evident. |
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Keywords: | Co-fermentation Cheese whey Ethanol production Hydrogen production |
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