Decolorization of Methyl Orange Simulated Wastewater by Chlorine Dioxide with Ultrasound

摘要

Experiments were conducted to investigate the decolorization of methyl orange simulated wastewater in order to assess the effectiveness and feasibility of ultrasound(US) enhanced high-purity chlorine dioxide(C102) oxidation process. The results showed that in ClO_2/US system the decolorization rate of methyl orange was up to 96%, which was increased by 8% as compared to ClO_2 treatment alone. The decolorization of methyl orange with/without ultrasonic irradiation follows apparent pseudo-first-order reaction kinetics. The apparent pseudo-first-order rate constant k_(app) was 0.19mm~(-1) in the ClO_2/US system, which was a little higher than O.Bmin~(-1) of rate constant achieved in ClO_2 treatment alone. It shows that ClO_2/US system can be an effective technology for the decolorization of azo dyes in wastewater.