• Title/Summary/Keyword: 내부 도류벽

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The Effect of Dead Zone on Hydraulic Efficiency in Clearwell (정수지내 사류지역이 수리학적 효율에 미치는 영향 연구)

  • Lee, Seungjae;Shin, Eunher;Kim, Sunghoon;Park, Heekyung
    • Journal of Korean Society of Water and Wastewater
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    • v.21 no.2
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    • pp.177-185
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    • 2007
  • Hydraulic efficiency($T_{10}/T$) in clearwell is often estimated by L/W ratio. However, this estimation is not accurate because other factors which give an effect on hydraulic efficiency such as shape of basin, diffuser wall and intra-basin is ignored. Therefore, in this research, hydraulic efficiency is predicted by the quantitative analysis of dead zone using CFD simulation in a pilot scale clearwell. The results show that the reason why higher L/W ratio increase the hydraulic efficiency is to decrease the dead zone of linear region which is located between baffles. Diffuser wall or intra-basin also affects on hydraulic efficiency with this process. Also, we conclude that hydraulic efficiency can not be reached to 0.8 or higher.

Internal Short-circuiting Estimation in Clearwell : Part B. Improving T10/T Using Intra Basin and Diffuser Wall by Applying ISEM to Field (정수지 내부 단락류 발생 평가 : Part B. 내부 단락류 평가 방법의 현장 적용을 통한 내부 도류벽과 정류벽을 이용한 T10/T 증가분석)

  • Shin, Eunher;Lee, Seungjae;Kim, Sunghoon;Park, Heekyung
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.1
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    • pp.113-120
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    • 2008
  • A large majority of clearwell must be modified with maintaining the present baffles since they were underground built with the material like concrete. Therefore it is unreasonable to apply the previous research in clearwell modification which is studied with the assumption that distance between baffles is constant. In this study, internal short-circuiting estimation method (ISEM), which has the advantage of being applied at any condition, is applied to evaluate modification of A clearwell and modify B and C clerwell which have unusual characteristics. After analyzing the hydraulic efficiency at current state, modifications, where baffles, intra basins and diffuser walls are additionally installed, are considered and evaluate using ISEM. And the effect of intra basin and diffuser wall on $T_{10}/T$ is estimated and application feasibility of ISEM is evaluated. The improvement of intra basins is almost same with that of baffles. Also, short-circuiting in effluent zone can be reduced with the same level of channel zone if intra basin is added in effluent zone. However, effect range is restricted to the next channel zone. Diffuser wall can obtain the lower ISI than minimum ISI of cases where baffles and intra basins are installed. Therefore, additional improvement of $T_{10}/T$ value can be expected after $T_{10}/T$ value converges maximum only using baffles