Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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The Effect of Sludge Settleability on the Performance of DNR Process

슬러지 침전성이 DNR 공정에 미치는 영향 평가

  • 서창원 (한국과학기술원 건설 및 환경공학과) ;
  • 란 티 뉴엔 ;
  • 정형석 (한국과학기술원 건설 및 환경공학과) ;
  • 이상민 (공주대학교 환경공학과) ;
  • 이의신 (대우건설기술연구소 환경연구팀) ;
  • 신항식 (한국과학기술원 건설 및 환경공학과)
  • Received : 2006.01.20
  • Accepted : 2006.04.10
  • Published : 2006.04.15
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Abstract

The sludge settleability is a key factor for operating activated sludge process as well as BNR (biological nutrient removal) process, because the poor sludge settling causes an increase of suspended solid in the effluent. In order to improving the sludge settleability, a settling agent such as iron dust can be applied. In this study, the effect of sludge settleability on the performance of DNR (Daewoo nutrient removal) process was investigated with GPS-X, which is the popular wastewater treatment process model program, and the result of modeling was verified with operating lab-scale DNR process. As a result, if the sludge blanket keeps stable in the secondary settling tank, the effluent quality is similar in spite of different SVI values. And in case of the good sludge settleability, short HRT or long SRT increased the biomass concentration in the bioreactor, and improved the pollutant removal efficiency. In spite of daily influent changing, the good sludge settleability also guaranteed the stable effluent quality. And the results of the lab-scale DNR process experiment could support the simulated results.

Keywords

References

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