Abstract
Nitrate in drinking water can pose a threat to human health. A study of the reduction of NO3-, by Fe0 is reported here. The anaerobic reduction of NO3- was carried out using Fe0 powder in unbuffered solutions from pH 2 to greater than 10. The initial pH of the solution was adjusted to 2, 3, or 4 by addition of HCl, H 2SO4, or CH3COOH, because the Fe oxidation and NO3- reduction reactions consume acidity. Under the conditions of this study, NH3/NH4+ were the only N products. The formation of green rusts divided the NO3- reduction process into two phases. Green rusts formed around a pH of 6.5 and contributed to the stabilization of pH. With H2SO 4, the available Fe surface area was limited, initially by the excessive accumulation of H2 gas at the interface, which inhibited NO3- reduction. The surface area normalized pseudo-first order reaction rates for NO3- reduction at pH>6.5 or after the formation of green rusts are consistent with those reported for buffered solutions.
| Original language | English |
|---|---|
| Pages (from-to) | 335-342 |
| Number of pages | 8 |
| Journal | Applied Geochemistry |
| Volume | 19 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2004 Mar 1 |
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ASJC Scopus subject areas
- Geochemistry and Petrology
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Nitrate reduction by zero-valent iron under different pH regimes. / Choe, Seunghee; Liljestrand, Howard M.; Khim, Jeehyeong.
In: Applied Geochemistry, Vol. 19, No. 3, 01.03.2004, p. 335-342.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nitrate reduction by zero-valent iron under different pH regimes
AU - Choe, Seunghee
AU - Liljestrand, Howard M.
AU - Khim, Jeehyeong
PY - 2004/3/1
Y1 - 2004/3/1
N2 - Nitrate in drinking water can pose a threat to human health. A study of the reduction of NO3-, by Fe0 is reported here. The anaerobic reduction of NO3- was carried out using Fe0 powder in unbuffered solutions from pH 2 to greater than 10. The initial pH of the solution was adjusted to 2, 3, or 4 by addition of HCl, H 2SO4, or CH3COOH, because the Fe oxidation and NO3- reduction reactions consume acidity. Under the conditions of this study, NH3/NH4+ were the only N products. The formation of green rusts divided the NO3- reduction process into two phases. Green rusts formed around a pH of 6.5 and contributed to the stabilization of pH. With H2SO 4, the available Fe surface area was limited, initially by the excessive accumulation of H2 gas at the interface, which inhibited NO3- reduction. The surface area normalized pseudo-first order reaction rates for NO3- reduction at pH>6.5 or after the formation of green rusts are consistent with those reported for buffered solutions.
AB - Nitrate in drinking water can pose a threat to human health. A study of the reduction of NO3-, by Fe0 is reported here. The anaerobic reduction of NO3- was carried out using Fe0 powder in unbuffered solutions from pH 2 to greater than 10. The initial pH of the solution was adjusted to 2, 3, or 4 by addition of HCl, H 2SO4, or CH3COOH, because the Fe oxidation and NO3- reduction reactions consume acidity. Under the conditions of this study, NH3/NH4+ were the only N products. The formation of green rusts divided the NO3- reduction process into two phases. Green rusts formed around a pH of 6.5 and contributed to the stabilization of pH. With H2SO 4, the available Fe surface area was limited, initially by the excessive accumulation of H2 gas at the interface, which inhibited NO3- reduction. The surface area normalized pseudo-first order reaction rates for NO3- reduction at pH>6.5 or after the formation of green rusts are consistent with those reported for buffered solutions.
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U2 - 10.1016/j.apgeochem.2003.08.001
DO - 10.1016/j.apgeochem.2003.08.001
M3 - Article
VL - 19
SP - 335
EP - 342
JO - Applied Geochemistry
JF - Applied Geochemistry
SN - 0883-2927
IS - 3
ER -