Ozonation with ultrasonic enhancement of p-nitrophenol wastewater
Xian-Wen Xu1, Hui-Xiang Shi, Da-Hui Wang
1Department of Environmental Science and Engineering, Zhejiang University, Hangzhou 310027, China. xxw118@zju.edu.cn
Abstract:
Synergetic effects for p-nitrophenol degradation were observed in the ozonation with ultrasonic enhancement. The enhancements of removal rate for p-nitrophenol and TOC were around 116% and 294% respectively in comparison with the individual ultrasound and ozonation systems. The synergetic phenomenon is attributed to two physicochemical mechanisms: (1) Ultrasound decomposes ozone causing augmentation of the activity of free radicals; (2) Ultrasonic wave increased the concentration of O(3) in solution because of ultrasonic dispersion.
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