Transport characterization and modelling of Donnan dialysis for ammonium recovery from aqueous solutions

Efficient recovery of ammonium, a valuable nutrient, from dilute streams is still an unsolved challenge. One possible approach to separate and simultaneously concentrate ammonium low concentration Donnan dialysis. To design process, mass transport model was utilized for both plate frame hollow fiber modules compared experiments. The chosen based on film theory, accounting resistances in the liquid as well membrane phase allow complete investigation transfer limitations. Experimental data flux potassium using flat sheet Nafion-115 FujiFilm type-2 Nafion membranes predicted very by several flow conditions concentrations. two stage removal could be accurately starting over orders magnitude concentration. For module case, draw side were more substantial vs. due lower velocity. Both showed similar rates, up 1[mol/(m2·h)]. In investigated, non-optimized, laboratory system, 80% achieved with processing 12.5 [L/(m2·h)].