Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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A Study on Flow Distribution to Flocculation Basins Using DOE and RSA

실험계획법과 반응표면분석법을 적용한 응집지로의 유량분배에 관한 연구

  • Kim, Seong-Jae (Guui Arisu Water Purification Center, Seoul Metropolitan Government) ;
  • Kyung, Gyu-Sun (Guui Arisu Water Purification Center, Seoul Metropolitan Government) ;
  • Jeong, Heui-Jung (Guui Arisu Water Purification Center, Seoul Metropolitan Government) ;
  • Kim, Hyeong-Seop (Guui Arisu Water Purification Center, Seoul Metropolitan Government) ;
  • Yang, Sa-Sun (Guui Arisu Water Purification Center, Seoul Metropolitan Government)
  • 김성재 (서울특별시 구의아리수정수센터) ;
  • 경규선 (서울특별시 구의아리수정수센터) ;
  • 정희중 (서울특별시 구의아리수정수센터) ;
  • 김형섭 (서울특별시 구의아리수정수센터) ;
  • 양사선 (서울특별시 구의아리수정수센터)
  • Received : 2012.04.13
  • Accepted : 2013.12.02
  • Published : 2013.12.30
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Abstract

The inequitable flow distribution to flocculation basins is an important problem faced in many water treatment plants. This is caused by the structure of a distribution channel, the height differences of outlet weirs etc. But, a modified approach for the structures has no effectiveness to achieve flow equality. The aim of this study is to reduce the inequality by adopting optimized inlet valve opening (%) of the flocculation basins using DOE (Design of Experiments) and RSA (Response Surface Analysis). The inlet valve openings (%) and inflow distributions (%) of 6 paralleled basins were set as factors (X) and characteristics(Y) respectively. 2 level factorial experiments and RSA were conducted for optimization and regression analysis (Y = f(X) + Const.). Adopting the optimized inlet valve opening (%) at field, standard deviation of flow distribution (%) and effluent turbidity was declined from 3.80% to 0.42% and from 0.29 NTU to 0.03 NTU respectively.

각 응집지로의 유입유량 불균등현상은 대부분 정수장에서 직면하고 있는 중요한 문제점이다. 이와 같은 유량의 불균등현상은 응집지 분배수로의 구조, 지별 유출위어의 높이차 등과 관계가 있으나, 시설물 구조개선에 의한 유량의 균등화는 투자비용 대비 실효성이 크지 않은 문제점이 있다. 본 연구의 목적은 정수 시설물의 개선 없이 실험계획법(DOE, Design Of Experiment)과 반응표면분석법(RSA, Response Surface Analysis)을 이용한 유입밸브 개도율의 최적화로 각 응집지로의 유입유량을 균등하게 하는 것이다. 병렬로 연결된 6개 응집지의 유입밸브 개도율(%)과 유량분배율(%)을 각각 특성치(Y)와 인자(X)로 선정하고, 실험계획법과 반응표면분석법을 적용하여 지별 유량 균등분배를 위한 지별 유입밸브 개도율의 최적화 및 회귀식을 산출하였다. 최적화된 지별 유입밸브 개도율의 현장 적용결과, 지별 유량분배율의 표준편차는 3.80%에서 0.42%, 지별 침전수탁도의 표준편차는 0.29 NTU에서 0.03 NTU로 각각 감소하였다.

Keywords

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