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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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The influence of temperature on the treatment efficiency of chlorinated organic substances contained in groundwater by permeable reactive barrier which is composed of $Fe^{\circ}$ has been investigated by constructing the Pourbaix diagrams for Fe-$H_2O$ system at different temperatures based on thermodynamic estimation. In aerobic condition, the equilibrium potentials for $Fe^{\circ}/Fe^{2+}$ and $Fe^{2+}/Fe^{3+}$ were observed to increase, therefore, the dechlorination reaction for organic pollutants by $Fe^{\circ}$ was considered to decline with temperature due to the diminished oxidation of reactive barrier. The result for the variations of the ionization fraction of $Fe^{2+}$ and $Fe^{3+}$ ion in the pH range of 0 ~ 2.5 obtained by employing Visual MINTEQ program showed that the ionization fraction of $Fe^{2+}$ increased with pH, however, that of $Fe^{3+}$ decreased symmetrically and the extent of the variation of ionization fraction for both ions was raised as temperature rises. The equilibrium pH for $Fe^{3+}/Fe(OH)_3$ was examined to decrease with temperature so that the treatment efficiency of chlorinated organic substance was expected to decrease with temperature due to the enhanced formation of passivating film in aerobic condition. The change of the reactivity of a specific chemical species with temperature was defined quantitatively based on the area of its stable region in Pourbaix diagram and depending on this the reactivity of $Fe^{3+}$ was shown to decrease with temperature, however, that of $Fe(OH)_3$ was decreased monotonously as temperature is raised for $Fe^{3+}/Fe(OH)_3$ equilibrium system. In anaerobic condition, the equilibrium potential for $Fe^{\circ}/Fe^{2+}$ was observed to rise and the equilibrium pH for $Fe^{2+}/Fe(OH)_2$ were examined to decrease as temperature increases, therefore, similar to that for aerobic condition the efficiency of the dechlorination reaction for organic substances was considered to be diminished when temperature rises because of the reduced oxidation of $Fe^{\circ}$ and increased formation of $Fe(OH)_2$ passivating film.
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참고문헌 (17)
참고문헌 신청
Benner, S. G. / 1999 / Geochemistry of a Permeable Reactive Barrier for Metals and Acid Mine Drainage / Environmental Science and Technology 33(16):2793~2799
Bieniasz, L. K. / 2004 / Use of Dynamically Adaptive Grid Techniques for the Solution of Electrochemical Kinetic Equations / Journal of Electroanalytical Chemistry 565(2):251~271
Chary, N. S. / 2012 / Determination of Volatile Organic Compounds in Drinking and Environmental Waters / TrAC Trends in Analytical Chemistry 32:60~75
Deborde, M. / 2008 / Reactions of Chlorine with Inorganic and Organic Compounds during Water Treatment-Kinetics and Mechanisms : a Critical Review / Water research 42(1):13~51
Ellis, P. A. / 2007 / Assessing the Impact of VOC-contaminated Groundwater on Surface Water at the City Scale / Journal of Contaminant Hydrology 91(1):107~127
Bieniasz, L. K. / 2004 / Use of Dynamically Adaptive Grid Techniques for the Solution of Electrochemical Kinetic Equations / Journal of Electroanalytical Chemistry 565(2):251~271
Chary, N. S. / 2012 / Determination of Volatile Organic Compounds in Drinking and Environmental Waters / TrAC Trends in Analytical Chemistry 32:60~75
Deborde, M. / 2008 / Reactions of Chlorine with Inorganic and Organic Compounds during Water Treatment-Kinetics and Mechanisms : a Critical Review / Water research 42(1):13~51
Ellis, P. A. / 2007 / Assessing the Impact of VOC-contaminated Groundwater on Surface Water at the City Scale / Journal of Contaminant Hydrology 91(1):107~127
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