Study on the effect of oxidative degradation of Orange G by sonochemical microreactor

Azo dye effluent is resistant to conventional wastewater treatment methods, posing severe threats to environmental safety. In the present work, a novel sonochemical microreactor featuring effective ultrasonic transmittance, improved temperature control, and continuous flow processing was designed to achieve efficient degradation of the Orange G (OG). The effects of persulfate dosage, ferrous dosage, initial pH, microchannel width, and ultrasonic power on OG degradation were studied. A maximum degradation efficiency of 96.0% was obtained in sonochemical microreactor degradation system with 6 min of treatment. The 30 s and 6 min degradation efficiency enhanced by ultrasound and microchannel was increased by 9.9% and 2.7%, respectively, compared with the conventional chemistry treatment. The newly designed sonochemical microreactor was clearly proved to have application potential for azo effluent treatment.

Automated summary

In this study, a novel sonochemical microreactor was designed to achieve efficient degradation of azo dye effluent. The system featured effective ultrasonic transmittance, improved temperature control, and continuous flow processing. The effects of different factors on the degradation efficiency of Orange G were investigated, and the maximum degradation efficiency reached 96.0% after 6 minutes of treatment. Compared with conventional chemistry treatment, ultrasound and microchannel enhanced the degradation efficiency by 9.9% and 2.7%, respectively, in this sonochemical microreactor system. The results clearly demonstrate the potential application of the newly designed microreactor for azo effluent treatment.