Domenico Foglia, Walter Wukovits, Anton Friedl, Mattias Ljunggren, Guido Zacchi, Krzysztof Urbaniec, Mariusz Markowski, Michael Modigell:
Integration study on a two-stage fermentation process for the production of biohydrogen
Chemical Engineering Transactions, 345-350
In order to make the hydrogen economy fully sustainable, renewable resources have to be employed for its production. Simulation models, developed with Aspen Plus to calculate mass and energy balances, will be used to integrate the process steps necessary to produce pure hydrogen from biomass in a 2-stage fermentation process. The main challenge is the reduction of water and heat demand connected to the low substrate concentration in the fermentation steps; the easiest solution is to partly recirculate outgoing process streams. Electrolyte equilibrium was considered during simulation of different recirculation options to evaluate important effects on the pH and on the system osmolality. The results show that certain recirculation options can reduce the heat and water demand significantly.