Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7713895 | International Journal of Hydrogen Energy | 2015 | 8 Pages |
Abstract
This study investigated pathways for anaerobic hydrogen production from biomass at low pH values, also known as dark fermentation. A 200Â l bench scale anaerobic baffled reactor with four internal compartments was used for hydrogen production from wheat starch. The liquid fermentation products and hydrodynamic characteristics were analyzed using high performance liquid chromatography, tracer studies, and gas analysis. A mean residence time of 29Â h and a feed strength of 4 gCOD/l resulted in a total gas production of 230Â l/d containing 42% hydrogen and 11% methane. The gas collected from the different compartments highly differed in composition showing a partial phase separation, with maximum H2 concentrations of up to 60% observed in the first compartment. 49% and 44% of the total H2 produced were derived during the formation of acetic and butyric acid respectively. Just 8% of the H2 was produced during propionic acid synthesis. Concentrations up to 1Â g/l lactic acid built by the bifidum pathway was also observed.
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Authors
Lars Jürgensen, Ehiaze Augustine Ehimen, Jens Born, Jens Bo Holm-Nielsen,