Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Reduction of Nitrate using Nanoscale Zero-Valent Iron Supported on the Ion-Exchange Resin

이온교환 능력을 가진 지지체에 부착된 나노 영가철을 이용한 질산성 질소의 환원과 부산물 제거

  • 박희수 (한국과학기술연구원 환경기술연구단) ;
  • 박용민 (한국과학기술연구원 환경기술연구단) ;
  • 조윤성 (한국과학기술연구원 환경기술연구단) ;
  • 오수경 (한국과학기술연구원 환경기술연구단) ;
  • 강상윤 (특허청) ;
  • 유경민 (주식회사 지오윅스) ;
  • 이성재 (주식회사 지오윅스) ;
  • 최용수 (한국과학기술연구원 환경기술연구단) ;
  • 이상협 (한국과학기술연구원 환경기술연구단)
  • Received : 2007.08.10
  • Accepted : 2007.10.29
  • Published : 2007.12.15
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Abstract

Nanoscale zero valent ion (nZVI) technology is emerging as an innovative method to treat contaminated groundwater. The activity of nZVI is very high due to their high specific surface area, and supporting this material can help to preserve its chemical nature by inhibiting oxidation. In this study, nZVI particles were attached to granular ion-exchange resin through borohydride reduction of ferrous ions, and chemical reduction of nitrate by this material was investigated as a potential technology to remove nitrate from groundwater. The pore structure and physical characteristics were measured and the change by the adsorption of nZVI was discussed. Batch tests were conducted to characterize the activity of the supported nZVI and the results indicated that the degradation of nitrate appeared to be a pseudo first-order reaction with the observed reaction rate constant of $0.425h^{-1}$ without pH control. The reduction process continued but at a much lower rate with a rate constant of $0.044h^{-1}$, which is likely limited by mass transfer. To assess the effects of other ions commonly found in groundwater, the same experiments were conducted in simulated groundwater with the same level of nitrate. In simulated groundwater, the rate constant was $0.078h^{-1}$ and it also reduced to $0.0021h^{-1}$ in later phase. The major limitation in application of ZVI for nitrate reduction is ammonium production. By using a support material with ion exchange capacity, the problem of ammonium release can be solved. The ammonium was not detected in the batch test, even when other competitive ions such as calcium and potassium existed.

Keywords

Acknowledgement

Supported by : 환경부

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