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Nitrate reduction by micro-scale zero-valent iron particles under oxic condition
Abstract The denitrification by zero-valent iron (ZVI) particles under oxic condition at various conditions was investigated in this study. After a 2-h reaction under oxic condition, NO 3 − -N removal and conversion to NH 4 + -N was 97.6% and 35.2%, respectively, when the initial NO 3 − -N concentration was 25 mg/L, the dose of 85 μm ZVI was 2 g/L, and the initial pH was 2.0. The injection of an additional electron doner (50 mg/L Fe2+) did not promote the reaction, but the initial pH greatly affects NO 3 − -N reduction, regardless of the presence of Fe2+. Phosphate promoted and inhibited NO 3 − -N sorption and reduction at low and high concentration, respectively, suggesting its role of both electron transfer enhancement and competition. The results of continuous experiments using a horizontal flow ZVI reactor showed that NO 3 − -N reduction efficiency was in a range of 88-100%, through a 1700 h operation. In addition, field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) analysis, and X-ray diffraction (XRD) analysis showed that hematite is the major reaction products of ZVI under oxic condition. The results in this study suggest that ZVI can successfully be used for denitrification under oxic condition, which can be an advantage over nano-scale ZVI.
Nitrate reduction by micro-scale zero-valent iron particles under oxic condition
Abstract The denitrification by zero-valent iron (ZVI) particles under oxic condition at various conditions was investigated in this study. After a 2-h reaction under oxic condition, NO 3 − -N removal and conversion to NH 4 + -N was 97.6% and 35.2%, respectively, when the initial NO 3 − -N concentration was 25 mg/L, the dose of 85 μm ZVI was 2 g/L, and the initial pH was 2.0. The injection of an additional electron doner (50 mg/L Fe2+) did not promote the reaction, but the initial pH greatly affects NO 3 − -N reduction, regardless of the presence of Fe2+. Phosphate promoted and inhibited NO 3 − -N sorption and reduction at low and high concentration, respectively, suggesting its role of both electron transfer enhancement and competition. The results of continuous experiments using a horizontal flow ZVI reactor showed that NO 3 − -N reduction efficiency was in a range of 88-100%, through a 1700 h operation. In addition, field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) analysis, and X-ray diffraction (XRD) analysis showed that hematite is the major reaction products of ZVI under oxic condition. The results in this study suggest that ZVI can successfully be used for denitrification under oxic condition, which can be an advantage over nano-scale ZVI.
Nitrate reduction by micro-scale zero-valent iron particles under oxic condition
Lee, Sangmin (author) / Yun, Youngsik (author) / Kim, Do-Gun (author)
KSCE Journal of Civil Engineering ; 21 ; 2119-2127
2017-01-13
9 pages
Article (Journal)
Electronic Resource
English
Nitrate reduction by micro-scale zero-valent iron particles under oxic condition
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