Decomposition of Acetic Acid Using Multiple Bubble Jets with Pulsed Electrical Discharge
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The oxidation potential of ozone (2.07 V) is not sufficient to achieve the efficient decomposition of persistent organic pollutants in the conventional water treatment process. Strong oxidizing agents such as OH and O radicals (oxidation potential 2.80 and 2.42 V, respectively) were successfully generated using multiple bubble jets with pulsed electrical discharge and used for the decomposition of acetic acid (CH3COOH), as a model pollutant. The flow dynamics of this novel water treatment process was clarified experimentally. The dynamic behavior of bubble jets with pulsed electrical discharge, streamer propagation along the bubble interface, and radical generation were investigated by high-speed visualization and spectroscopic measurements. The decomposition characteristics of CH3COOH were determined such as applied frequency, the duty ratio of applied voltage, gas flow rate, the initial CH3COOH concentration to achieve the maximum decomposition of CH3COOH, and higher energy efficiency compared to the previous electrical discharge gas–liquid processes.
KeywordsWater treatment Persistent organic pollutants Acetic acid decomposition Hydroxyl radicals Bubble jets Pulsed electrical discharge
This work was supported in part by the Global COE Program, “World Center of Education and Research for Trans-disciplinary Flow Dynamics (2012),” MEXT, Japan, the Japan Society for the Promotion of Science under a Grant-in-Aid for Scientific Research (A) (Nos. 23246032 and 26249015), and A-STEP, Exploratory Research (AS232Z01376B), JST. We would like to give our sincere thanks to Prof. Koichi Yasuoka with Tokyo Institute of Technology, Mr. Satoru Taguchi of Kawase Pro. Ltd., and Ph.D. student Mr. Tomohiro Shibata of IFS, Tohoku University, for their valuable comments and also to technicians Mr. Kazunari Katagiri and Mr. Tomoki Nakajima of IFS, Tohoku University, for their skillful technical supports. Furthermore, we would like to appreciate Nobby Tech Ltd. for using the ultra-high-speed framing camera.
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