Abstract

ROA-MORALES, Gabriela et al. Removal of Color and Chemical Oxygen Demand Using a Coupled Coagulation-Electrocoagulation-Ozone Treatment of Industrial Wastewater that Contains Offset Printing Dyes. J. Mex. Chem. Soc [online]. 2014, vol.58, n.3, pp.362-368. ISSN 1870-249X.

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

Keywords : Dye; AHC; Coagulation; Electrocoagulation; Ozonation.

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