암모니아성 질소 첨가에 따른 상향류 혐기성 블랭킷 반응조내 입상슬러지의 저해 기작

Inhibition Mechanism of Ammonia Nitrogen on the Granules in an Upflow Anaerobic Sludge Blanket Reactor

  • 이채영 (수원대학교 토목공학과) ;
  • 한선기 (한국방송통신대학교 환경보건학과) ;
  • 신항식 (한국과학기술원 건설 및 환경공학과)
  • Lee, Chae Young (Department of Civil Engineering, The University of Suwon) ;
  • Han, Sun Kee (Department of Environmental Health, Korea National Open University) ;
  • Shin, Hang Sik (Department of Civil and Environmental Engineering, KAIST)
  • 투고 : 2007.11.01
  • 심사 : 2007.11.26
  • 발행 : 2007.11.30

초록

The upflow anaerobic sludge blanket (UASB) reactor can be effective for treating simple organic compounds containing high concentration of ammonia nitrogen. The chemical oxygen demand (COD) removal efficiency was about 80% at ammonia nitrogen concentration up to 6,000 mg-N/L. This result also showed that it would be possible to treat propionate effectively at free ammonia nitrogen concentration up to 724 mg-N/L if sufficient time was allowed for adaptation. However the specific methanogenic activity (SMA) of granule was lower than that of granule in the reactor with lower ammonia nitrogen concentration. At 8,000 mg-N/L, the inhibition of high ammonia concentration was observed with evidence of increase of the volatile suspended solids (VSS) concentration in the effluent. It might be ascribed to the decrease in the content of extracellular polymer (ECP), which resulted to the sloughing off of obligated proton-reducing acetogens and heterogenotrophic methanogens from the exterior of granular sludge. This caused a great portion of the finely sludge to be easily washed out. Therefore, failure to maintain the balance between these two groups of microorganism cause accumulation of the hydrogen partial pressure in the reactor, which could have inhibited the growth of acetate utilizing methanogens.

키워드

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