Donnan dialysis is a selective membrane process driven by an electrochemical potential. It can be used for arsenate [As(Ⅴ)] removal from drinking water. In this study

the effects of the intermembrane As(Ⅴ) mobility

membrane affinity to As(Ⅴ)

membrane effective area and its thickness on As(Ⅴ) removal kinetics were investigated based on the analysis of the process variables in an As(Ⅴ) dialytic model. The results indicated that when the rotation rate was higher than 200 r·min-1

the intermembrane diffusion was the rate-limiting step for the As(Ⅴ) mass transfer in the Donnan dialysis process. Higher intermembrane mobility

larger membrane area and thinner membrane accelerated the As(Ⅴ) removal on the same degree. However

they did not change the residual As(Ⅴ) concentration in the feed solution at the Donnan equilibrium. The conditions of both feed and stripping solutions affected the As(Ⅴ) concentration gradient across the membrane. Besides the As(Ⅴ) flux

they also altered the Donnan equilibrium. Membrane module of the high packed density and in-situ As(Ⅴ) removal from stripping solution were proposed for the development of novel arsenic removal device based on Donnan dialysis.