Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Comparison of Removal Characteristics of Organic Matter, Nitrogen and Phosphorus in Suspended-Growth and Hybrid Processes with Hydraulic Retention Time

수리학적 체류시간에 따른 부유성장 미생물을 이용한 공정과 하이브리드 공정의 유기물, 질소 및 인 제거 특성 비교

  • Ryu, Hong-Duck (Department of Environmental Engineering, Chungbuk National University) ;
  • Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
  • 류홍덕 (충북대학교 공과대학 환경공학과) ;
  • 이상일 (충북대학교 공과대학 환경공학과)
  • Published : 2006.01.31
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Abstract

This study was initiated to evaluate the effect of HRT(hydraulic retention time) on removal efficiencies of organic matter (C), nitrogen(N) and phosphorus(P) in municipal wastewater for suspenced-growth processes(MLE; Modified Ludzack-Ettinger) and hybrid process(Modified-Dephanox). M-Dephanox process was designed to improve the performance of Dephanox process on denitrification efficiency. As the results, removal efficiencies of C, N and P in M-Dephanox process, which is hybrid process, were higher than those in MLE, which is suspended-growth process. Especially, nitrification inhibition of MLE was observed more severely than M-Dephanox as hydraulic retention time was reduced from 6 hr to 3.5 hr. Nitrification in nitrification reactors on M-Dephanox, at short HRT, was so excellent that ammonia nitrogen removal efficiency in nitrification reactors of M-Dephanox was about 92% at 1.59 hr of HRT of nitrification reactors, however, nitrification in nitrification reactors on M-Dephanox was affected severely by organic matter entering to nitrification reactors from downstream settler. It was observed that reducing of HRT in whole process resulted from reducing of HRT in nitrification reactors on M-Dephanox.

본 연구는 도시하수 처리시 부유성장 미생물만을 이용하는 MLE(Modified Ludzack-Ettinger) 공정과 부유 및 부착 미생물을 동시에 활용하는 하이브리드(hybrid)형 공정인 M-Dephanox(Modified-Dephanok) 공정의 유기물, 질소 및 인 제거효율을 수리학적 체류시간에 따라 상호 비교 검토하고자 하였다. H-Dephanox 공정은 기존 Dephanox 공정의 단점을 극복하기 위하여 고안된 공정으로서 기존 Dephanox 공정에 비해 탈질 효율을 증가시킬 수 있도록 고안되었다. 수리학적 체류시간에 따른 유기물, 질소 및 인 제거효율을 관찰한 결과 하이브리드 공정인 H-Dephanox 공정이 MLE 공정에 비해 높은 제거효율이 관찰되었으며, 특히 질산화의 경우 수리학적 체류시간이 6, 5, 4, 3.5 hr으로 짧아짐에 따라 MLE 공정이 M-Dephanox 공정에 비해 질산화 영향을 더 심하게 받는 것으로 나타났다. M-Dephanox 공정의 질화반응조에서의 암모니아성 질소 제거 효율은 질산화 반응조의 HRT 1.59 hr에서 약 92%를 나타내 매우 짧은 수리학적 체류시간에서도 질산화 반응이 원활하게 일어나는 것을 관찰 할 수 있었으며, 질산화 반응조로 유입되는 유기물의 영향을 심하게 받는 것으로 관찰되었다. 질산화 반응조에서의 HRT 단축은 전체 공정의 HRT도 줄이는 결과를 가져옴을 관찰 할 수 있었다.

Keywords

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