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Carbon disulfide removal by zero valent iron

Kalin, R. and McGeough, K.L. and Myles, P. (2007) Carbon disulfide removal by zero valent iron. Environmental Science and Technology, 41 (13). pp. 4607-4612. ISSN 0013-936X

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Abstract

The use of zero valent iron (Fe-0) for the remediation of water contaminated with carbon disulfide (CS2), a common groundwater contaminant, has been evaluated in this study. Mineralogical analysis of Fe-0 filings and polished Fe-0 cross-sections indicates that iron sulfide is formed due to the removal of carbon disulfide from solution by Fe-0. The kinetics of CS2 removal by Fe-0 was examined through both batch and column testing, and it is demonstrated that CS2 is removed rapidly from solution. A linear relationship was observed, through batch testing, between the pseudofirst-order rate constant (k(obs)) and the surface area concentration of Fe-0 (rho a). Data obtained from kinetic batch tests performed at four temperature levels conformed to the Arrhenius equation, anc the calculated apparent activation energy (E-a) was 37 +/- 2.3 kJ mol(-1), indicating that the kinetics of CS2 removal by Fe-0 is controlled by a chemical surface reaction. The temperature correction factors for CS2 from a reference of 25 degrees C were x 1.4 for 18 degrees C, x 1.7 for 15 degrees C, x 2.0 for 12 degrees C, and x 2.3 for 9 degrees C. Surface area normalization of kob, obtained through batch and column testing gives specific reaction rate constants (k(SA)) within 1 order of magnitude, indicating that kSA values are useful as a general descriptor of CS2-Fe-0 reaction kinetics and that these values provide a clear starting point for design calculations prior to commencing site-specific treatability studies for permeable reactive barrier design.