Ozone assisted electrocoagulation in a rectangular internal-loop airlift reactor: Application to decolorization of acid dye

摘要: Abstract Decolorization of synthetic wastewater containing Acid Brown 214, a typical triazo acid dye, was carried out by ozone assisted electrocoagulation as an advanced oxidation process. Ozonation and electrocogulation were performed simultaneously in the riser downcomer sections lab-scale rectangular airlift reactor, respectively, where ozonated gas had no influence on dielectric constant. A good mixing achieved with liquid circulation induced gaseous ozone, without need mechanical mixing. Taguchi experimental design method orthogonal arrays L27 “larger is better response” category applied to determine optimum conditions for dye removal. The operating variables considered initial pH, concentration, salt current density, superficial velocity decolorization period three levels. Under conditions, synergistic effect combined process reaching complete 30 min energy consumption 7.4 kWh/kg removed. Results indicated that combination innovative configuration single reactor cost effective compared obtained individually separate conventional reactors.