| Title |
Kinetics of Reductive Denitrification of Nitrate by Nanoscale Fe° Particles |
| Authors |
최승희(Seung Hee Choe),김지형(Jee Hyeong Khim),장윤영(Yoon Young Chang),황경엽(Kyung Yub Hwang) |
| Abstract |
For environmental remediation of a contaminated groundwater plume the use of zero-valent metal represents one of the latest innovative technologies. In this paper, the kinetics of denitrification by zero-valent iron (Fe°) has been studied for an analysis of factors effecting contaminant degradation rates. Batch studies demonstrated that synthesized nanoscale iron granular, characterized by high surface area to mass ratios(31.4㎡/g) and high reactivities can quickly remove nitrate from nitrate-polluted water within minutes. Compared the ability of nanoscale Fe° with that of microscale Fe° to destruct reductively nitrate at room temperature (23℃), the reactivity of Fe° with nitrate depends on its specific surface area and shows higher observed reaction rate constant k_(obs) with nanoscale iron powder. The reductive reaction of nitrate with nanoscale Fe° indicated that the degradation of nitrate appeared to be pseudo first-order with respect to nitrate concentration, with the observed reaction rate constant k_(obs) (0.1463 min^(-1)) appearing to be directly proportional to the specific surface area to volume ratio. The minimal effects of muting rate (rpm) on nitrate reduction rates suggest that the observed reaction rates were controlled by mass transfer of the nitrate to the metal surface in low mixing intensity. |