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Nitrite Removal by Autotrophic Denitrification Using Sulfur Particles

황입자를 이용한 독립영양탈질에서의 아질산성질소 탈질 조건 탐색

  • Kang, Woo-Chang (Department of Biological Environment, Kangwon National University) ;
  • Oh, Sang-Eun (Department of Biological Environment, Kangwon National University)
  • 강우창 (강원대학교 바이오자원환경학과) ;
  • 오상은 (강원대학교 바이오자원환경학과)
  • Received : 2010.06.11
  • Accepted : 2010.09.20
  • Published : 2010.09.30

Abstract

Swine wastewater contains high amounts of organic matter and nutrients (nitrogen and phosphorus). The biological nitrogen removal can be achieved by nitrification and denitrification processes. Nitrification-denitrification can be performed via nitrite which is called as the short-cut process. This Short-cut process saves up to 25% of oxygen and 40% of external carbon during nitrification and denitrification. In this study, the batch tests were conducted to assess the different parameters for the nitrite sulfur utilizing denitrification, such as alkalinity, temperature, initial nitrite concentration, and dissolved oxygen. The experimental results showed that the nitrite removal efficiency of the reactor was found to be over 95% under the optimum condition ($30^{\circ}C$ and sufficient alkalinity). Autotrophic nitrate denitrification was inhibited at low alkalinity condition showing only 10% removal efficiency, while nitrite denitrification was achieved over 95%. The nitrite removal rates were found similar at both $20^{\circ}C$ and $30^{\circ}C$. In addition, nitrite removal efficiencies were inhibited by increasing oxygen concentration, but sulfate concentration increased due to sulfur oxidation under an aerobic condition. Sulfate production and alkalinity consumption were decreased with nitrite compared those with nitrate.

Keywords

Autotrophic denitrification;Nitrite shortcut process;Sulfur particles;Sulfur utilizing bacteria

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