Enhanced hydrogen production from sewage sludge by cofermentation with wine vinasse |
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| Affiliation: | 1. Department of Environmental Technology, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C., Av. Normalistas 800, Col. Colinas de la Normal, C.P. 44270 Guadalajara, Jalisco, Mexico;2. Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011 Valladolid, Spain;3. Sanitary Engineering Section, Faculty of Civil Engineering and Geosciences, Department of Water Management, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands;4. Department of Environmental Engineering and Water Technology, UNESCO-IHE Institute for Water Education, P. O. Box 3015, 2601 DA Delft, The Netherlands;1. Chemical Engineering Department, Polytechnic School, University of São Paulo (DEQ/EP/USP), Av. Prof. Lineu Prestes 580, Bloco 18 – Conjunto das Químicas, SP 05508-000, Brazil;2. Biological Process Laboratory, São Carlos School of Engineering, University of São Paulo (LPB/EESC/USP), Av. João Dagnone 1100, São Carlos, SP 13563-120, Brazil;1. 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;2. Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luis, km 235, 13565-905, São Carlos, São Paulo, Brazil |
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| Abstract: | The cofermentation of sewage sludge and wine vinasse at different mixing ratios to enhance hydrogen production was investigated. Batch experiments were carried out under thermophilic conditions with thermophilic sludge inoculum obtained from an acidogenic anaerobic reactor. The results showed that the addition of wine vinasse enhances the hydrogen production of sewage sludge fermentation. The highest hydrogen yields, 41.16 ± 3.57 and 43.25 ± 1.52 mL H2/g VSadded, were obtained at sludge:vinasse ratios of 50:50 and 25:75, respectively. These yields were 13 and 14 times higher than that obtained in the monofermentation of sludge (3.17 ± 1.28 mL H2/g VSadded). The highest VS removal (37%) was obtained at a mixing ratio of 25:75. Cofermentation had a synergistic effect the hydrogen yield obtained at a sludge:vinasse ratio of 50:50 was 40% higher, comparing to the sum of each waste. Furthermore, kinetic analysis showed that Cone and first-order kinetic models fitted hydrogen production better than the modified Gompertz model. |
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| Keywords: | Hydrogen production Cofermentation Sludge Wine vinasse |
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