Abstract The present work studies the feasibility to treat distillery wastewaters (vinasses) using the coagu-lants: polyaluminum chloride, anionic and cationic polyacrylamide, a mixture of them and anultrafiltration membrane. The vinasse was characterized carrying out color and turbidity measures. Theoptimalcoagulantanditsdoseweredetermined.Thereductioninturbiditywasfoundtobe0%,35%and70% when anionic, cationic polyacrylamide and polyaluminum chloride respectively were used; whenmixing PAC with the cationic polyacrylamide, it was possible to obtain an additional 28% and 10% re-movalinturbidityandcolorrespectively.Afterwards,thevinassewasfilteredusinganultrafiltrationpro-cess with a ceramic membrane of 0.005µm of pore diameter with and without coagulants. The resultsshowacolorandturbidityreductionof70%and90%respectively.Whenusingcoagulantstheremovalin-creased to 97%. It may be concluded that the efficiency of the coagulants used is low although its use to-gether with an ultrafiltration membrane leads to satisfactory results.Key words: Wastewater, distillery, vinasses, coagulants, membrane.