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낮은 C/N비에서 운영되는 유로변경식 생물여과 공정의 질소 제거 특성

Nitrogen Removal Characteristics in DynaFlow Biofilter System Using Sewage Wastewater of Low C/N Ratio

  • Kim, Jin-Sik (Department of Environmental Engineering, Chungbuk National University) ;
  • Kim, Kyu-Ri (Department of Environmental Engineering, Chungbuk National University) ;
  • Kang, Han-Sol (Department of Environmental Engineering, Chungbuk National University) ;
  • Won, In-Seop (Department of Environmental Engineering, Chungbuk National University) ;
  • Kim, Keum-Yong (Department of Environmental Engineering, Chungbuk National University) ;
  • Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
  • 투고 : 2011.08.30
  • 심사 : 2012.03.28
  • 발행 : 2012.03.30

초록

본 연구는 유로변경식 3단 BAF를 사용하여, C/N ($TCOD_{cr}$/TKN)비가 낮은 생활하수를 대상으로 질소 처리 효율을 향상시키기 위해 제안되었다. 체류시간 6시간에서의 유로변경 3단 BAF의 효과를 평가하기 위해 실험실 규모로 실시하였다. 유로변경식 3단 BAF 공정이 3단 BAF보다 총 질소 제거효율이 약 7% 높은 것으로 나타났는데, 이것은 유기물을 효율적으로 사용하였기 때문이다. 또한 암모니아성 질소의 제거는 독립적인 호기조에서 질산화만을 수행하였기 때문에 질산화 효율이 안정적이었다. 이것은 본 연구에서 제안한 유로변경식 3단 BAF공정이 유기물 흡착을 이용하여 질소의 제거, 탈질 및 질산화에서 우수한 효율을 보였다.

In this study, a 3-stage biological aerated filter (BAF) system was proposed to enhance nitrogen removal in the treatment of low carbon to nitrogen ratio (C/N ratio) municipal wastewater. Laboratory experiments were conducted to evaluate the effects of dynamic-flow at the HRT of 6 h. Results of the long-term operation of 3-stage BAF systems showed that the dynamic-flow enabled the total nitrogen removal (T-N) removal efficiency of the system to be about 7 % higher than that of non-dynamic-flow system in treating domestic wastewater due to the more efficient use of organic substrates. The overall $NH_4$-N removal performance was stable during the operational period due to the unique system configuration where independent nitrification occurred. It was concluded that the 3-stage BAF system proposed in this study provided excellent performance in the removal of nitrogen by employing dynamic-flow and three columns functioning as sorption, denitrification and nitrification, respectively.

키워드

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