Industrial offset printing processes generate wastewater withhighly colored obtaining values of 5x106 Pt-Co units and great valuesof chemical oxygen demand (COD) 5.3x10-5 mg L-1. Thus, conventionaltechnologies such as biologicals treatment fail in reaching thedischarge limits. In this research, a sequential treatment was applied:coagulation with aluminum hydroxychloride (AHC), electrocoagulationwith Al anodes and finally ozonation. Optimal conditions arefound when adding 20 mg L-1 AHC, followed by electrocoagulationat 4 A for 50 min, and finally alkaline ozonation for 15 min, resultingin an overall color removal of 99.99% color and 99.35% COD.