Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Nitrate Removal and Recycling Technique

질산 제거 및 재이용 기술

  • Lee, Kyoung Hee (Clean Technology Research Center, Korea Institute of Science and Engineering) ;
  • Sim, Sang Jun (Clean Technology Research Center, Korea Institute of Science and Engineering) ;
  • Choi, Guang Jin (Clean Technology Research Center, Korea Institute of Science and Engineering) ;
  • Kim, Young Dae (Clean Technology Research Center, Korea Institute of Science and Engineering) ;
  • Woo, Kyoung ja (Clean Technology Research Center, Korea Institute of Science and Engineering) ;
  • Cho, Young Sang (Clean Technology Research Center, Korea Institute of Science and Engineering) ;
  • Choi, Eui-So (Department of civil and Environment Engineering, Korea university)
  • 이경희 (한국과학기술연구원 청정기술연구센터) ;
  • 심상준 (한국과학기술연구원 청정기술연구센터) ;
  • 최광진 (한국과학기술연구원 청정기술연구센터) ;
  • 김영대 (한국과학기술연구원 청정기술연구센터) ;
  • 우경자 (한국과학기술연구원 청정기술연구센터) ;
  • 조영상 (한국과학기술연구원 청정기술연구센터) ;
  • 최의소 (고려대학교 토목환경공학과)
  • Published : 1997.12.01
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Abstract

A new process has been developed for nitrate and other salts removals from polluted waters. Alumina cement and calcium oxide served as precipitating agents to remove nitrate with stirring at basic pH. Low content of alumina in the commercialized alumina cements resulted in a increasing in nitrate removal yield. It is found that the compositions of aluminium and calcium are the most important factors in successful nitrate insolubilization. In order to remove high concentration of nitrate in polluted water, multi-stage precipitation was found to be very effective. Sulfate, chloride, and phosphate ions as well as nitrate were also removed by the precipitated reaction. After precipitation, post-treatments including Na2CO3 addition and neutralization with acid alleviated the level of aluminium and calcium in the treated water.

본 실험은 알루미나 시멘트와 산화칼슘을 이용해 염기성 조건에서 질산염을 침전시킴으로써 오염수를 처리하는 공정에 관한 것이다. 시중에 시판되고 있는 알루미나 시멘트 중 알루미나 함량이 낮은 시멘트가 높은 질산염 제거를 보였다. 알루미늄과 칼슘의 성분비는 침전반응에 가장 중요한 요소임을 알 수 있었다. 고농도의 질산염 폐수의 처리를 위해 다단계의 침전반응이 효과적이었다. 질산염 뿐만 아니라 황산, 인산 및 염소의 제거에도 침전반응에 의한 제거가 가능하였다. 반응 후에 탄산나트륨의 첨가와 산을 이용한 중화를 포함한 후처리로 처리수내에 용출된 알루미늄과 칼슘의 제거가 가능하였다.

Keywords

Acknowledgement

Grant : 환경복원 및 재생기술

Supported by : 과학기술처