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Economic process to produce biohydrogen and volatile fatty acids by a mixed culture using vinasse from sugarcane
Eduardo Bittencourt Sydney1, Christian Larroche2, Alessandra Cristine Novak3
1Bioprocess Engineering and Biotechnology Department, Federal University of Parana, Centro Politécnico, Usina Piloto B, CEP 81531-990 Curitiba, Paraná, Brazil; Clermont Université, Université Blaise Pascal, Labex IMobS3, Institut Pascal, Polytech Clermont-Ferrand, 24 avenue des Landais, BP 20206, 63174 Aubière Cedex, France.
Abstract:
This work evaluates the potential of vinasse (a waste obtained at the bottom of sugarcane ethanol distillation columns) as nutrient source for biohydrogen and volatile fatty acids production by means of anaerobic consortia. Two different media were proposed, using sugarcane juice or molasses as carbon source. The consortium LPBAH1 was selected for fermentation of vinasse supplemented with sugarcane juice, resulting in a higher H2 yield of 7.14 molH2 molsucrose(-1) and hydrogen content in biogas of approx. 31%, while consortium LPBAH2 resulted in 3.66 molH2/molsucrose and 32.7% hydrogen content in biogas. The proposed process showed a rational and economical use for vinasse, a mandatory byproduct of the renewable Brazilian energy matrix.
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