Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Continuous Measurement of Ammonium-nitrogen and Nitrate-nitrogen using a Ion-Selective Microelectrode

이온선택성 미소전극을 이용한 암모니아성 질소 및 질산성 질소의 연속 농도 측정

  • Lim, Mi-Ji (Department of Civil & Environmental Engineering, Pusan National University) ;
  • Seon, Ji-Yun (Department of Civil & Environmental Engineering, Pusan National University) ;
  • Park, Jeung-Jin (Department of Civil & Environmental Engineering, Pusan National University) ;
  • Byun, Im-Gyu (Department of Civil & Environmental Engineering, Pusan National University) ;
  • Park, Tae-Joo (Department of Civil & Environmental Engineering, Pusan National University) ;
  • Lee, Tae-Ho (Department of Civil & Environmental Engineering, Pusan National University)
  • 임미지 (부산대학교 사회환경시스템공학부) ;
  • 선지윤 (부산대학교 사회환경시스템공학부) ;
  • 박정진 (부산대학교 사회환경시스템공학부) ;
  • 변임규 (부산대학교 사회환경시스템공학부) ;
  • 박태주 (부산대학교 사회환경시스템공학부) ;
  • 이태호 (부산대학교 사회환경시스템공학부)
  • Received : 2008.06.29
  • Accepted : 2008.10.14
  • Published : 2008.11.30
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Abstract

The ion selective microelectrode (ISME) has been used for measuring the ion profile of DO, $NH_4{^+}-N$, $NO_2{^-}-N$ and $NO_3{^-}-N$ in biofilm. In this study we evaluated the detection limit and validity of ISME and applied ISME for the continuous measurement of $NH_4{^+}-N$ and $NO_3{^-}-N$ concentration in the modified Ludzack-Ettinger (MLE) process. Average detection limits of $NH_4{^+}-N$ and $NO_3{^-}-N$ ISME were $10^{-4.44}M$ and $10^{-4.62}M$, respectively. Since the ISME with $5{\sim}10{\mu}m$ of tip diameter showed a faster response time than that of $1{\sim}5{\mu}m$, the ISME with a tip diameter of $5{\sim}10{\mu}m$ was fabricated and used to make real-time ion detections. Direct monitoring of $NH_4{^+}-N$ and $NO_3{^-}-N$ concentrations in the aerobic (2) tank causes the instability of the electromotive force (EMF) for the initial 5~8 hours and also causes remarkable error values of $NH_4{^+}-N$ and $NO_3{^-}-N$ concentration. This phenomenon is caused by aeration and mixing in the reactor. Thus, the measuring chamber was newly designed for the aerobic (2) tank and then the EMF of the ISME were stabilized in less than 1 hour. Errors of $NH_4{^+}-N$ and $NO_3{^-}-N$ concentration were decreased after stabilization of the EMF. The ISME analysis were well corresponded to the results of auto analyzer and ion chromatography. Consequently, the concentration of $NH_4{^+}-N$ and $NO_3{^-}-N$ could be continuously measured for 178 hours by the ISME.

Keywords

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