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Environmental Engineering Research 2001;6(1): 1-6.
THE RAPID DENITRIFICATION OF NITRATE-POLLUTED WATER BY SYNTHESIZED NANOSCALE IRON PARTICLES
Seunghee Choe1, Kyung-Yub Hwang2, Yoon-Young Chang3, and Jeehyeong Khim1
1Department of Civil & Environmental Engineering, Korea University, Seoul 136-701, Korea
2Korea Institute of Science & Technology, P. O. BOX 131, Seoul 136-650, Korea
3Department of Environmental Engineering, Kwangwoon University, Seoul 139-701, Korea
Corresponding Author: Jeehyeong Khim ,Tel: +82-2-3290-3318, Fax: +82-2-928-7656, Email: hyeong@mail.korea.ac.kr
Received: November 15, 2000;  Accepted: December 14, 2000.
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ABSTRACT
The use of zero-valent iron represents one of the latest innovative technologies in the reducing process. In recent years, considerable efforts have been made to remove nitrate in water. Zero-valent iron powder has been considered for the potential use in removing nitrate in aqueous solutions. In this study, the use of synthesized nanoscale zero-valent iron particles was examined for the treatment of nitrate-polluted water under ambient anaerobic conditions. Nanoscale iron particles successfully reduced most of nitrates within 30 min into nitrogen gas without pH control at various initial concentrations of 50 to 400 mg NO3- /L, while no significant reduction of nitrate was observed with microscale iron powders. The pH changed in the range of 6.5 — 9.3 and provided thermodynamically favorable conditions to produce nitrogen gas as a final product instead of ammonia. This study demonstrated that synthesized nanoscale iron particle, which was characterized by high specific surface area and high reactivities could quickly remove nitrate from nitrate-polluted water within minutes.
Keywords: denitrification | nanoscale | nitrate | zero-valent iron
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