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Nitrate Reduction without Ammonium Release using Fe-loaded Zeolite  

Lee Seunghak (School of Civil, Urban & Geosystem Engineering, Seoul National University)
Lee Kwanghun (School of Civil, Urban & Geosystem Engineering, Seoul National University)
Lee Sungsu (School of Civil, Urban & Geosystem Engineering, Seoul National University)
Park Junboum (School of Civil, Urban & Geosystem Engineering, Seoul National University)
Publication Information
Journal of Soil and Groundwater Environment / v.10, no.1, 2005 , pp. 1-5 More about this Journal
Abstract
Nitrate reduction with zero valent iron $(Fe^0)$ has been extensively studied, but the proper treatment for ammonium byproduct has not been reported yet. In groundwater, however, ammonium is regarded as contaminant species, and particularly, its acceptable level is regulated to 0.5 mg-N/L. for drinking water. This study is focused on developing new material to reduce nitrate and properly remove ammonium by-products. A new material, Fe-loaded zeolite, is derived from zeolite modified by Fe(II) chloride followed by reduction with sodium borohydride. Batch experiments were performed without buffer at two different pH to evaluate the removal efficiency of Fe-loaded zeolite. After 80 hr reaction time, Fe loaded zeolite showed about $60\%$ nitrate removal at initial pH of 3.3 and $40\%$ at pH of 6 with no ammonium release. Although iron filing showed higher removal efficiency than Fe-loaded zeolite at each pH, it released a considerable amount of ammonium stoichiometrically equivalent to that of reduced nitrate. In terms of nitrogen species including $NO_3-N$ and $NH_4^+-N$, Fe-loaded zeolite removed about $60\%\;and\;40\%$ of nitrogen in residual solution at initial pH of 3.3 and 6, respectively, while the removal efficiency of iron filing was negligible.
Keywords
Fe-loaded zeolite; Zero valent iron; Nitrate reduction; Ammonium;
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