Decolorization of Acid blue 25 dye by non-thermal plasma advanced oxidation process for industrial wastewater treatment

In this paper a pin-to-plate high-voltage corona discharge system is designed to investigate experimentally for its effect on intensifying the rate of Acid blue 25 dye removal efficiency from industrial wastewater. An investigation for the optimal air gap distance between pin and surface of wastewater is carried out using 3D-EM simulator to satisfy maximum electric field intensity at the tip of the pin. The results show that the optimum distance for corona discharge is approximately 0.5 cm. The voltage and electric field distribution in the space between the high voltage and ground electrodes are concerned about present understanding of the mechanisms of corona discharge and ozone generation. A setup of a two pin-to-plate high-voltage corona discharge system has been designed and investigated experimentally for its effect on the removal of Acid blue 25 dye. Experimental measurements were carried out to determine the effect of different parameters such as con-tact time, agitation speed, gap distance between the high voltage and ground electrode, and materials of pin and plate on decoloration efficiency of the dye. The decolorization behavior using Advanced Oxidation Process (AOP) non-thermal plasma exhibit 80% dye removal efficiency within 10min. The complete decolorization was achieved within 35min for different initial dye concentrations from 10 up to 100ppm. The influences of pin and plate material types on the treatment process were examined with three different materials: Aluminum, Copper and Stainless steel. The maximum decolorization efficiencies of Acid blue 25 dyes are 82.04%, 90.78%, and 99.03% after treatment time 15min for Copper, Aluminum, and Steel respectively on decolorization efficiency of Acid blue 25 dyes was examined.