Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effects of Environmental Factors on Nitrite Accumulation in a Strong Nitrogen Removal System

고농도 질소폐수 처리 공정에서 환경인자가 아질산염 축적에 미치는 영향

  • 박노백 (농촌진흥청 국립농업과학원) ;
  • 최우영 (충북대학교 환경공학과) ;
  • 윤애화 (충북대학교 환경공학과) ;
  • 전항배 (충북대학교 환경공학과) ;
  • 박상민 (한국과학기술연구원 물환경센타)
  • Received : 2009.10.23
  • Accepted : 2010.02.10
  • Published : 2010.02.15
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Abstract

The high concentration of N in the wastewater from livestock farming generally renders the efficiency of the wastewater treatment. Therefore, removal of N in livestock wastewater is crucial for successful treatment. The current study was conducted to investigate the optimum conditions for partial nitrification under anaerobic condition following nitritation in TPAD-BNR(two-phase anaerobic digestion-biological nitrogen removal) operating system. Sequential operating test to stimulate partial nitrification in reactor showed that partial nitrification occurred at a ratio of 1.24 in $NO_2{^-}$-N:$NH_4{^+}$-N. With this result, a wide range of factors affecting stable nitritation were examined through regression analysis. In the livestock wastewater treatment procedure, the hydraulic retention time (HRT) and pH range for optimum nitrite accumulation in the reactor were 1-1.5 days and 7-8, respectively. It was appeared that accumulation of $NO_2{^-}$-N in the reactor is due to inhibition of the $NO_2{^-}$-N oxidizer by free ammonia (FA) while the effect of free nitrous acid was minimal. Nitrification was not influenced by DO concentration at a range of 2.0-3.0 mg/L and the difference in the growth rate between $NH_4{^+}$-N oxidizer and $NO_2{^-}$-N oxidizer was dependent on the temperature in the reactor.

Keywords

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