There are different techniques which are used for removal of dyes from aqueous effluents.To carry out biochemical and chemical oxidation processes is needed the grouping and concentration of dyes in order to ease the degradative process.The above can be achieved by the use of polymer-enhanced ultrafiltration (PEUF); this is method continuous, environmentally friendly and easily adaptable to features of effluent and nature of dye.Therefore, the objective of this work was to study the use of PEUF for Acid Blue 129 (AB129) removal from aqueous effluents in order to be used as previous stage to its degradation by oxidation processes.PEUF experiments were performed using poly(allyl(triethyl)ammonium chloride) as water-soluble polymer, cellulose membranes and an ultrafiltration unit with dead-end flow under different values of pHs.Also, experiments in absence of polymer were performed.Results shown that two stages can be identified during the retention experiments, a first stage of flocculation followed of a stage Acid Blue 129 Synthetic dye Ultrafiltration PEUF Water treatment Acid Blue 129 Colorante sintético Ultrafiltración PEUF Tratamiento de aguas