Vinasse generates from alcohol production process has become as a secondary feedstock for bioenergy production. However, due to the lack of nitrogen source, an additional of nitrogen source is needed to enhance the microbial growth and its production performance. Therefore, brewer's yeast was used to co-digest with vinasse to produce hydrogen owing to its high nitrogen and carbon contents. Investigated parameters were vinasse, brewer's yeast, and fly ash concentrations. Fly ash was used as the buffer in the biohydrogen production process. The maximum cumulative hydrogen production of 6,226.67 ml-H_2 /L was obtained at 9.0 g-VS/L of vinasse, 28.0 g-VS/L of brewer's yeast and 4,000 mg-CaO/L of fly ash, respectively. The hydrogenic effluent left over from the optimal hydrogen production was further used as the substrate for methane production. The maximum methane yield of 100.99 ml-CH_4 /g-VS_(added) was obtained. The overall energy production in a two-stage bio-hydrogen and methane production from the co-digestion process was 5.45 Kj/g-VS_(added)
展开▼
