TY - JOUR
T1 - Transport characterization and modelling of Donnan dialysis for ammonium recovery from aqueous solutions
AU - Zwijnenberg, Harmen J.
AU - Elozeiri, Alaaeldin A.E.
AU - de Grooth, Joris
AU - van der Meer, Walter G.J.
AU - Wood, Jeffery A.
PY - 2023/5/15
Y1 - 2023/5/15
N2 - Efficient recovery of ammonium, a valuable nutrient, from dilute streams is still an unsolved challenge. One possible approach to separate and simultaneously concentrate ammonium from low concentration streams is Donnan dialysis. To design a process, a mass transport model was utilized for both plate and frame and hollow fiber modules and compared to experiments. The chosen model was based on film theory, accounting for mass transport resistances in the liquid as well as the membrane phase to allow for a complete investigation of mass transfer limitations. Experimental data for the flux of ammonium and potassium using flat sheet Nafion-115 and FujiFilm type-2 and hollow fiber Nafion membranes was predicted very well by the model for several flow conditions and concentrations. The two stage ammonium removal could be predicted accurately from a starting concentration over two orders of magnitude in concentration. For the hollow fiber module case, liquid phase resistances on the draw side were more substantial vs. plate and frame due to the lower velocity. Both plate and frame and hollow fiber modules showed similar transport rates, up to 1[mol/(m2·h)]. In the investigated, non-optimized, laboratory system, an 80% removal of ammonium was achieved with a processing flow of 12.5 [L/(m2·h)].
AB - Efficient recovery of ammonium, a valuable nutrient, from dilute streams is still an unsolved challenge. One possible approach to separate and simultaneously concentrate ammonium from low concentration streams is Donnan dialysis. To design a process, a mass transport model was utilized for both plate and frame and hollow fiber modules and compared to experiments. The chosen model was based on film theory, accounting for mass transport resistances in the liquid as well as the membrane phase to allow for a complete investigation of mass transfer limitations. Experimental data for the flux of ammonium and potassium using flat sheet Nafion-115 and FujiFilm type-2 and hollow fiber Nafion membranes was predicted very well by the model for several flow conditions and concentrations. The two stage ammonium removal could be predicted accurately from a starting concentration over two orders of magnitude in concentration. For the hollow fiber module case, liquid phase resistances on the draw side were more substantial vs. plate and frame due to the lower velocity. Both plate and frame and hollow fiber modules showed similar transport rates, up to 1[mol/(m2·h)]. In the investigated, non-optimized, laboratory system, an 80% removal of ammonium was achieved with a processing flow of 12.5 [L/(m2·h)].
KW - Ammonium recovery
KW - Donnan dialysis
KW - Flat sheet
KW - Hollow fiber
KW - Mass transfer model
U2 - 10.1016/j.memsci.2023.121496
DO - 10.1016/j.memsci.2023.121496
M3 - Article
AN - SCOPUS:85149411951
SN - 0376-7388
VL - 674
JO - Journal of Membrane Science
JF - Journal of Membrane Science
M1 - 121496
ER -