This paper deals with the functioning of an integrated membrane system composed as follows: [Graphics] where CEM denotes a membrane made of cation-exchange polymer. The system combines the functions of Donnan dialysis (DD) and pertraction in the multimembrane hybrid system (MHS). The MHS consists of an agitated bulk liquid membrane acid two CEMs. The DD-MHS system was designed to improve the treatment of feed solutions with the use of ionic carriers (liquid membranes (LM)), the sodium or potassium salts of which are highly surface active, or enhance the formation of reversed micelles and miroemulsions, e.g. di-(2-ethylhexyl) phosphoric acid (D2EHPA). The system was tested with the use of an alkaline electroplating solution containing zinc, magnesium, calcium, sodium, and potassium species. The performance of the DD-MHS was compared with the results of the: simple DD, and the pel traction in the MHS carried out separately. Under similar experimental conditions, the separation coefficient alpha (Zn)(SigmaM) increases from 0.6 (MHS, D2EHPA) or 0.26 (DD) to 5.1 in the case of the DD-MHS with D2EHPA, and 180-600 with Cyanex 302. The construction of the DD-MHS protects the emulsification of an organic phase (LM) and enables the preconcentration of metallic cations before their specific separation with the use of a proper carrier in a liquid membrane.