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Oxidation of Geosmin and 2-MIB in Water Using $O_3/H_2O_2$: Kinetic Evaluation  

Lee, Hwa-Ja (Water Quality Research Institute, Waterworks Headquarter)
Son, Hee-Jong (Water Quality Research Institute, Waterworks Headquarter)
Roh, Jae-Soon (Water Quality Research Institute, Waterworks Headquarter)
Lee, Sang-Won (Water Quality Research Institute, Waterworks Headquarter)
Ji, Ki-Won (Water Quality Research Institute, Waterworks Headquarter)
Yoo, Pyung-Jong (Water Quality Research Institute, Waterworks Headquarter)
Kang, Lim-Seok (Department of Environmental Engineering, Pukyong National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.7, 2007 , pp. 826-832 More about this Journal
Abstract
Unpleasant tastes and odors in drinking water cause same problems for water utilities across Korea. Even though tastes and odors do not create health problems, they are main concerns for consumers who determine the safety of their drinking water. In this study, two different odor producing compounds(geosmin 2-MIB) in the Nakdong river water and rapid sand filtered rater were treated by advanced oxidation of $O_3/H_2O_2$ process. The experimental results showed that the removal efficiency of geosmin with the use of 5 mg/L of $O_3$ and $H_2O_2$ was higher than efficiency with the use of $O_3$ alone for both the raw water and the sand filtered water. And in general, the removal efficiency of geosmin was higher than 2-MIB in the sand filtered water. Under the range of $O_3$ concentration $0.5\sim2.0$ mg/L, the removal rate constants(k) of geosmin for the raw and sand filtered waters, and the one of 2-MIB in the sand filtered water were increased rapidly as doses of $O_3$, and $H_2O_2$, increased. The removal rate constants(k) do not increase any more when $H_2O_2/O_3$ ratio increases above the optimum ratio. The optimum ratio of $H_2O_2/O_3$, dose was $1.0\sim2.0$ for both geosmin and 2-MIB. The removal rate constant(k) becomes lower when OH radical consuming materials are present in raw water. The half-life of geosmin decreased rapidly as the $O_3$ and $H_2O_2$ doses increase in the sand filtered water. The half life decreased about 8.5 times with the use of 2 mg/L of $O_3$ and 10 mg/L of $H_2O_2$ than with the use of 2 mg/L of $O_3$ alone for the sand filtered water.
Keywords
Tastes and Odors; Geosmin; 2-MIB; $O_3/H_2O_2$; Oxidation Kinetic;
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