Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Effects of Nitrifying Bacterial Communities with Different HRTs and Backwashing Periods in Modified BAF Process

Modified BAF 공정에서 HRT 및 역세주기가 질산화 미생물의 군집에 미치는 영향

  • Jung, Chul-Soo (Department of Environmental Engineering, Pusan National University) ;
  • Park, Jeung-Jin (Department of Environmental Engineering, Pusan National University) ;
  • Ju, Dong-Jin (Department of Environmental Engineering, Pusan National University) ;
  • Kwon, Soo-Youn (Department of Environmental Engineering, Pusan National University) ;
  • Choi, Won-Seok (Bioentech company, Ltd.) ;
  • Byun, Im-Gyu (Department of Environmental Engineering, Pusan National University) ;
  • Park, Tae-Joo (Department of Environmental Engineering, Pusan National University)
  • Received : 2007.10.12
  • Accepted : 2007.11.08
  • Published : 2007.11.30
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Abstract

The upflow Biobead$^{(R)}$ process, one of biological aerated filters (BAF), which was used commercially, invented for removal of organic materials and nitrification. This process was modified to enhance the ability of denitrification through the induction of pre-anoxic tank. In this research, we investigated the effects of hydraulic retention time (HRT) and backwashing period in aerobic tank. The characteristics of nitrifying bacteria, which are composed of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), also investigated using fluorescence in situ hybridization (FISH). Even though the HRT was shortened, the efficiency of nitrification was not decreased when the organic loading rate and ammonium-nitrogen loading rate were $2.10kg/m^3/day$ and $0.25kg/m^3/day$, respectively. And then the distribution ratios of AOB and NOB showed the similar patterns. However, when the backwashing period was lengthened from 12 hours to 24 hours in aerobic 1 tank, the nitrification efficiency was decreased to 63.9% from 89.2%. The results of FISH explained that this decrease of nitrification efficiency was caused by the decrease of distribution ratio of AOB in aerobic 1 tank. The nitrification efficiencies of aerobic 1 and aerobic 2 tank were increased when the backwashing period was lengthened because of relative high distribution ratios of nitrifying bacteria.

Keywords

Acknowledgement

Supported by : 한국환경기술진흥원

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