Integrated Advanced Oxidation Process (Ozonation) and Electrocoagulation Treatments for Dye Removal in Denim Effluents

摘要

The present research aims to study the removal of indigo carmine dye used in industrial denim dyeingprocesses. For this purpose, integrated advanced oxidation process comprising ozone andelectrocoagulation techniques were used. After ozone was applied 64% color removal, 78% turbidityremoval and 3% COD reduction was observed. With the electrocoagulation treatment a 22%, 21% and9% of color removal, turbidity removal and COD reduction were achieved, respectively. However;using the integrated process, 65% color removal, 76% turbidity removal and 37% COD reductioncould be attained. The synergistics associated to coupling both processes yielded increased removal ofcolor, COD and turbidity efficiencies as compared with the results obtained with the single treatments.The decrease in the intensity of the Uv-vis spectrum between the raw wastewater and the treatedwastewater indicated that oxidation and organic removal took place in the integrated process. Thisresult is consistent with the cyclic voltammograms obtained.