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The Effect of Fumed Silica on Nitrate Reduction by Zero-valent Iron  

Cho, Dong-Wan (Department of Environmental Engineering, Yonsei University)
Jeon, Byong-Hun (Department of Environmental Engineering, Yonsei University)
Kim, Yong-Je (Geologic Environment Division, KIGAM)
Song, Ho-Cheol (Geologic Environment Division, KIGAM)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.6, 2010 , pp. 599-608 More about this Journal
Abstract
The effect of silica(fumed) on nitrate reduction by zero-valent iron(ZVI) was studied using batch experiment. The reduction of nitrate was tested in three different aqueous media including de-ionized water, artificial groundwater and real groundwater contaminated by nitrate. Kinetics of nitrate reduction in groundwater were faster than those in de-ionized water, and first-order rate constant($k_{obs}$) of ZVI/silica(fumed) process was about 2.5 time greater than that of ZVI process in groundwater. Amendment of Silica(fumed) also decreased ammonium presumably through adsorption on silica surface. The pHs in all processes increased due to oxidation of ZVI, but the increase was lower in groundwater due to buffering capacity of groundwater. The result also showed amount of reduced nitrate increased as initial nitrate concentration increased in groundwater. Separate adsorption isotherm experiments indicated that fumed silica itself had some degree of adsorption capacity for ammonium. The overall results indicated that silica(fumed) might be a promising material for enhancing nitrate reduction by ZVI.
Keywords
Zero-valent iron; Silica; Reduction; Nitrate; Ammonium;
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