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| Ozonation with ultrasonic enhancement of p-nitrophenol wastewater |
| XU Xian-wen, SHI Hui-xiang, WANG Da-hui |
| Department of Environmental Science and Engineering, Zhejiang University, Hangzhou 310027, China |
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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 O3 in solution because of ultrasonic dispersion.
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Received: 15 October 2004
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