| Title |
Rapid Denitrification of Nitrate - Polluted Water by Nanoscale Iron |
| Authors |
장윤영(Yoon Young Chang), 최승희(Seung Hee Choe), 신정엽(Jung Yup Shin), 황경엽(Kyung Yub Hwang) |
| Abstract |
In recent years considerable efforts for the removal of nitrate have been made in the development of nitrate removal techniques. One of the conventional treatment methods of nitrate is biological denitrification. However, this process needs other carbon sources for microbial activities and a long period of time to reduce the nitrate level in polluted water. In this study nitrate reduction using synthesized zero-valent iron powder(Fe˚) with nanoscale was proposed in situ or above-ground treatment of nitrate-polluted water at room temperatures and pressures. Nanoscale iron removed 50, 100, 200, and 400㎎/l of nitrate within 30min with little intermediates. Compared with commercial iron powders(15∼75㎛), the synthesized iron powder(1∼100㎚) showed high removal efficiencies(10∼100times) in a short time period with low metal to solution ratio(4∼10g/100㎖). The approach presented offers unique opportunities for both fundamental research and technological applications of zero-valent metals to nitrate-polluted water. For example, iron can be used to construct a reactive barrier in the path of a contaminated groundwater plume to remove NO_(3-). |