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Removal of Nitrate by Ferrous Cement Hydrates  

Kang, Wan-Hyup (한양대학교 토목공학과)
Park, Tae-Sook (한양대학교 토목공학과)
Park, Joo-Yang (한양대학교 토목공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.19, no.1, 2005 , pp. 53-60 More about this Journal
Abstract
Ferrous cement hydrates made from hydrating Portland cement doped with Fe (II) were reported to reductively dechlorinate chlorinated organics and to reduce Cr (VI) to Cr (III). In this study, kinetics of nitrate removal by ferrous cement hydrates were investigated. Nitrate removal kinetics were characterized by experimental variables such as cement hydration, amount of cement addition, Fe (II) dose, pH, and byproducts. As a result, hydrated cement showed better performances than non-hydrated cement due to the formation of LDH (layered double hydroxide). Doping of Fe (II) into the cement was found to improve removal efficiency at high pHs by association with Fe (II) sorbed on cement hydrates as a reactive reductant. Reduction of nitrate produced ammonium as a major product, which accounted for 63.5% of the final products, and nitrite (0.15%) as a minor product. These results indicate that the developed media are effective as sorbent/reducing agents in the nitrate removal and the reaction mechanisms of nitrate removal are sorption and reduction.
Keywords
nitrate; ferrous cement hydrates; layered double hydroxide(LDH); sorption; reduction;
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