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Transformation Characteristics of Chlorinated Aliphatic Hydrocarbon (CAH) Mixtures by Natural Ores  

Son, Bong-han (Department of Environmental Health, Korea National Open University)
Kim, Nam-hee (Department of Environmental Engineering, Korea University)
Hong, Kwang-pyo (Department of Environmental Engineering, Korea University)
Yun, Jun-ki (Samsung Corporation Reserch Institute of Technology)
Lee, Chae-young (Department of Civil Engineering, Suwon University)
Kim, Young (Department of Environmental Engineering, Korea University)
Kwon, Soo-youl (Department of Environmental Health, Korea National Open University)
Publication Information
Journal of Korean Society on Water Environment / v.23, no.5, 2007 , pp. 712-722 More about this Journal
Abstract
This study screened three natural ores (iron, mangenase, and zinc), two types of slags, and two elemental metals (elemental iron and zinc) to evaluate transformation characteristics of CAH mixtures [e.g. Carbontetrachloride (CT), 1,1,1-Trichloroethane (1,1,1-TCA), and Perchloroethene (PCE)]. To select an effective metal medium to treat the CAH mixtures, we measured transformation capacities (CAH mass ultimately transformed/mass of metal added) and the degree of dechlorination. We also considered economical efficiency of the metal media by comparing the value, CAH mass ultimately transformed divided by the price of metal medium added. A simplified mathematical model adapting CAH transformation capacity, first-order transformation kinetics, and available mass of metal transforming CAH was developed and used for estimating CAH transformation rate coefficient and longevity of the metal medium. CAH transformation capacity for elemental iron and elemental zinc were 4258~7129 and $4215{\sim}6330{\mu}g\;CAH\;transformed/g$ metal added, respectively, which are a factor of 80~200 higher than slags and natural ores. They also showed a factor of 1.1 to 2.2 greater degree of dechlorination than the others. Among natural ores and slags, Zinc ore showed the highest transformation capacity, $47{\sim}53{\mu}g\;CAH\;transformed/g$ metal added. Although zinc ore have smaller transformation capacity than elemental metals, economical efficiency of zinc ore is a factor of 10~20 greater than elemental metals tested. Consequently, zinc ore would be more economical medium than the others tested in this study. We estimated the pseudo first-order transformation rate of zinc ore was in the order of CT > 1,1,1-TCA > PCE.
Keywords
Carbontetrachloride; Dechlorination; Kinetics; Natural ores containing zero-valent metal; Perchloroethylene; 1,1,1-Trichloroethane;
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