Removal of Color and Chemical Oxygen Demand Using a Coupled Coagulation-Electrocoagulation-Ozone Treatment of Industrial Wastewater that Contains Offset Printing Dyes
DOI:
https://doi.org/10.29356/jmcs.v58i3.146Keywords:
Dye, AHC, Coagulation, Electrocoagulation, OzonationAbstract
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.Downloads
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Published
2017-10-12
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