The effect of media ion and nitrogen gas dissolved in water on color removal with sonolysis, Fenton and sono-Fenton in the continuous flow ultrasonic reactor

Abstract

Ultrasound has been reserced as an alternative technique for color removal methods from water and wastewater. In this study the colar removal from water using sonolysis, Fenton and Sono-Fento was investigated and the effects of power intensity, media ions and nitrojen gas dissolved in water were investigated in model working solution with Basic Red 29 Dye in the continous flow ultasonic reactor. The experimentation was performed at 22 kHz ultrasonic frequency with different power intensity application in the ultrasonic system. The optimum color removal efficiency was achieved with 0.45 W/cm2 power intensity. The color removal efficiency of Basic Red 29 was raised to two times with the coexistent effect of media ions while the media ions and dissolved gas increased four times simultaneusly. To conclude, the color removal efficiency follewed from this order in sonolysis: N2+ SO4-2+ HCO-3+NO3-2 > HCO-3> SO4-2+ HCO-3+NO3-2> SO4-2 >N2> NO3-2. In Fenton process, the effects of Fe+2 and H2O2 concentration on system performance were examined obtaining 89% color removal efficiency by using 20 mg/L Fe+2 and 1000mg/L H2O2. With the hybrid Sono-Fenton process, the required Fe+2 amount decreased by 1/5, when the color removal efficiency increased to 98 % and there is no significant effects of media ions and dissolved gas on Fenton and Sono-Fenton treatment. As a result of toxicity studies, it was seen that the initial toxicity of wastewater decreased with treatment and the Sono-Fenton method was the most effective method on toxicity removal.It was determined that color removal using Sono-Fenton can be accomplished successfully, economicly and environmental friedly.

Keywords

• sonolysis
• Fenton
• Sono-Fenton
• color removal
• media ions
• nitrogen gas
• toxicity

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