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The industry of soluble coffee generates wastewater containing complex and hard to degrade mixtures of different substances. Their mineralization is not completely effective through conventional treatment methods. In this work, as a treatment alternative, a sequential Electrocoagulation-Anodic Oxidation (EC-AO) process is studied. The effect of electrode material (v.g., two different anodes (graphite and Boron-Doped Diamond (BDD)) and six different cathodes (stainless steel, titanium, iron, aluminum, graphite and BDD)) and of support electrolyte (NaCl or Na2SO4) on degradation performance of AO, in the terms of color and chemical oxygen demand (COD) reduction, as well as Total Suspended Solids (TSS) formation and pH, were experimentally tested. The obtained results were compared with the most recent Colombian environmental regulation. Additionally, for each case, a comprehensive operational costs analysis was performed. All the above information allowed to select two electrode systems as the most promising for the AO step: BDD-stainless steel + Na2SO4: very efficient but expensive (reduction of COD = 75% and 12 USD/ m3) and graphite-stainless steel + NaCl: less efficient and more economic one (reduction of COD = 67% and 7 USD/m3).

Tratamiento de aguas residuales de la industria del café soluble vía Electrocoagulación - Oxidación Anódica. Selección de los electrodos