2013 Fiscal Year Final Research Report

Development of catalytic ozonation system of aqueous nitrogen

Research Project

Project/Area Number	23560642
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Civil and environmental engineering
Research Institution	Kyoto University
Principal Investigator	ECHIGO Shinya 京都大学, 工学(系)研究科(研究院), 准教授 (70359777)
Project Period (FY)	2011 – 2013
Keywords	触媒 / 酸化処理 / オゾン / アンモニウムイオン
Research Abstract	To better control trace ammonium ion in water, an important precursor of chlorinous odor of drinking water, the oxidation characteristics and mechanisms of ammonium ion in catalytic ozonation was investigated through a serious of semi-batch oxidation experiments with a dilute aqueous solution at room temperature. Our results show that oxidation of the ammonium ion in catalytic ozonation is initiated by adsorption ammonium ion onto the catalyst surface, and that the role of hydroxyl radical is negligible. In addition, the oxidation of the ammonium ion was enhanced by some co-existing substances (i.e., chloride, calcium, acetate, and oxalate ions). That is, co-existing substances play a major role in catalytic ozonation.

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