한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제30권1호
  • /
  • Pages.1-7
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  • 2014
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  • 2289-0971(pISSN)
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  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
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Biological Aerated Filter에서 유입 질소농도에 따른 아질산화 특성

Nitritation Characteristics Depending on Influent Nitrogen Concentration in a Biological Aerated Filter

  • 유익근 (울산대학교 화학공학부)
  • Yoo, Ik-Keun (School of Chemical Engineering and Bioengineering, University of Ulsan)
  • 투고 : 2013.11.13
  • 심사 : 2013.12.11
  • 발행 : 2014.01.30
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초록

The purpose of this study was to investigate the nitrification characteristics of biological aerated filter (BAF) packed with ceramic media, especially focusing on nitrite build-up during nitrification. When increasing the nitrogen load above $1.63kgNH_4{^+}-N/m^3{\cdot}d$, ammonium removal efficiency decreased to less than 60% and the nitrite ratio ($NO_2{^-}-N/NO_x-N$) of higher than 75% was achieved due to the inhibitory free ammonia (FA, $NH_3-N$) concentration and oxygen limitation. FA inhibition, however, is not recommended strategy to promote nitrite build-up since FA concentration in the reactor is coupled with decreased ammonium removal efficiency. Nitrite ratio in the effluent was also affected by aeration rate and influent ammonium concentration. Ammonium oxidation was enhanced at a higher aeration rate regardless of influent ammonium concentration but, the nitrite ratio was dependent on both aeration rate and influent ammonium concentration. While a higher nitrite ratio was obtained when BAFs were fed with $50mgNH_4{^+}-N/L$ of influent, the nitrite ratio significantly decreased for a greater influent concentration of $200-300mgNH_4{^+}-N/L$. Taken together, aeration rate, influent ammonium concentration and FA concentrations kept in the BAF were found to be critical variables for nitrite accumulation in the BAF system.

키워드

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피인용 문헌

  1. A Study on Performance Estimation and Operation Strategy of Biological Aerated Filter Using Semi-Empirical Biofilm Model vol.30, pp.3, 2014, https://doi.org/10.15681/KSWE.2014.30.3.269