At a critical micelle concentration, surfactant micelles attract oppositely charged metal ions on their surface by columbic force and organic dyes can be entrapped by the micellar core via hydrophobic-hydrophobic interaction. Methylene Blue (MB) and Reactive Black 5 (RB5) dyes were removed by ultrafiltration with the help of oppositely charged surfactants SDS and CTAB. Simultaneous separation of Alizarin Red S (ARS) and zinc ions was accomplished by chelation and micellization. Thermodynamics of micellar enhanced ultrafiltration (MEUF) was discussed and the separation performance of the process measured in terms of the rejection percentage and the permeate flux which were evaluated by using the membranes of variable pore sizes.