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The peroxi-coagulation process has been used for treatment of aqueous solutions of four dyes with different structures, namely C.I. Basic blue 3 (BB3), Malachite green (MG), C.I. Basic red 46 (BR46) and C.I. Basic Yellow 2 (BY2) at pH 3.0. The experiments were conducted using an open, undivided and cylindrical glass cell in the presence of sulfate electrolyte media with a carbon nanotube–polytetrafluoroethylene (CNT–PTFE) electrode as cathode. Outer and inside diameters of used carbon nanotube were 8–15nm and 3–5nm, respectively. Up to 90% decolorization of each of the dyes occurred in less than 10min. BY2 has been used as a model among the dyes to study the effect of operational parameters, modeling of process by artificial neural networks (ANN) and calculating operation costs. TOC measurements of the BY2 and mixed dyes showed 92% and 93% decontamination at 6h, respectively. Relationship …