| Popis: |
The following work aims to estimate the production of biogas in the liquid and gaseous phases in an anaerobic reactor by means of simulation. For this, the ADM 1 model modified by Mendes et al. (2016) is used to represent the simultaneous removal of carbon and nitrogen (SRCN) from a fishery effluent. Henry equation, originally used to represent thermodynamic equilibrium, is hereby replaced by a method that aggregates more robust equations, available in the simulator Aspen Plus. Therefore, the validity of Henry’s law is tested by applying an equilibrium condition that considerate liquid phase modeling by means of eNRTL method. The results show that when applying the thermodynamic method, the gaseous concentrations for CH4, N2, H2 and acetic acid are lower than those foreseen by ADM 1, and the presence of these dissolved components in the liquid phase is indicated. That way, it is verified that the consideration of equilibrium condition is fundamentally important for anaerobic digestion process, besides indicating the need for more in-depth studies about the influence of this consideration in the process. |
