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example, as a reactive component in a packed column to
treat pharmaceutical or ammunition wastewater, as has been
suggested for the treatment of wastewater containing other
energetic compounds (39). Our results also show that
reduction of NG with cast iron may occur at different reaction
sites and through multiple mechanisms involving adsorbed
Fe2+ and graphite inclusions. In contrast, NO2- is most likely
reduced on iron surface and by Fe2+ adsorbed to oxides,
whereas graphite inclusions are probably less important.
Further studies are needed to understand how hydropho-
bicity or other properties of an oxidant can influence the
importance of its graphite-mediated reduction in a cast iron-
water system.
(34) O’Hannesin, S. F.; Gillham, R. W. Ground Water 1998, 36, 164-
170.
(35) McMahon, P. B.; Dennehy, K. F.; Sandstrom, M. W. Ground
Water 1999, 37, 396-404.
Acknowledgments
This study was supported in part by the National Science
Foundation (Award #9984669).
(36) United States Environmental Protection Agency. Field applica-
tion of in situ remediation technologies: Permeable reactive
barriers; EPA 542-R-99-002; U.S. EPA: Washington, DC, 1999.
(37) Mantha, R.; Taylor, K. E.; Biswas, N.; Bewtra, J. K. Environ. Sci.
Technol. 2001, 35, 3231-3236.
(38) Perey, J. R.; Chiu, P. C.; Huang, C. P.; Cha, D. K. Water Environ.
Res. 2002, 74, 221-225.
Supporting Information Available
Experimental and/ or modeling results of (1) NG reduction
-
with cast iron, (2) NG and NO2 reduction in dialysis cells
with graphite, and (3) NO2- reduction by Fe2+ and magnetite.
This material is available free of charge via the Internet at
http:/ / pubs.acs.org.
(39) Oh, S. Y.; Chiu, P. C.; Kim, B. J.; Cha, D. K. Water Res. 2003, 37,
4275-4283.
(40) Balko, B. A.; Tratnyek, P. G. J. Phys. Chem. 1998, 102, 1459-
1465.
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