Multicomponent Fickian solution-diffusion model for osmotic transport through membranes

Osmotically-assisted membrane processes (OAMP) are separation technologies that leverage osmotic gradients to recover water from brine. Accurate modeling of the solute-coupling effects for transmembrane transport is integral development and subsequent optimization OAMP unit operations. In literature, multicomponent in commonly linearized, species fluxes computed using binary solution-diffusion theory then superposed. However, recent publications highlight large predictive errors associated with such an approach as coupling between ignored. this paper, we demonstrate significant improvements can be obtained when interactions incorporated. Here, present a model, by extending model diffusion theory. When coefficients available, find average absolute deviation (AAD) decreased 21.0% 3.0% 7 unique combinations forward osmosis involving ternary mixtures. absence data coefficients, regress impact on solute fluxes, excess permeabilities. For case H2O-NaCl-EtOH process, AAD shown decrease 66.1% 7.2% NaCl concentrations 0.0 1.5 M EtOH mass fractions 0.5. These values extended analyze implications thermodynamic area requirements desalination systems employing OAMP.