정수지 내부 단락류 발생 평가: Part A. 정수장 내부 단락류 분석을 통한 장폭비와 형태가 T10/T 값에 미치는 영향 연구 (Internal Short-circuiting Estimation in Clearwell : Part A. Investigation the Effect of LW Ratio and Shape on T10/T using Internal Short-circuiting Estimation)

서지정보

· 발행기관 : 대한상하수도학회
· 수록지 정보 : 상하수도학회지 / 22권 / 1호 / 105 ~ 112페이지
· 저자명 : 신은허, 이승재, 김성훈, 박희경

초록

Disinfection is a basic and effective microorganism inactivation method and historically contributed a decrease in waterborne diseases. To guarantee the disinfection ability, improving T in CT value is important. Many indexes are used to estimate the hydraulic efficiency, however, these are black-box analysis. Therefore it is need to develope new estimation method. In this study, internal short-circuiting estimation method (ISEM) is developed using CFD and we inquire into the factor which causes increase of T10/T value as LW ratio increases. And the effect of shape on the relation of LW ratio and T10/T is analyzed. As LW ratio increases, internal short-circuiting index (ISI) of influent and effluent zone is rapidly reduced and recirculation and dead zone are reduced in channel zone. Therefore, as the T10/T value converges maximum value, ISI curve is changed from "V" shape to "U" shape and hydraulic efficiency is improved especially in downstream portion of clearwell. The less the shape ratio(width/length of clearwell) is the less the T10/T value is at a same LW ratio because the portion of turning zone increases as shape ration decreases, therefore more boundary separation is generated.

영어초록

Disinfection is a basic and effective microorganism inactivation method and historically contributed a decrease in waterborne diseases. To guarantee the disinfection ability, improving T in CT value is important. Many indexes are used to estimate the hydraulic efficiency, however, these are black-box analysis. Therefore it is need to develope new estimation method. In this study, internal short-circuiting estimation method (ISEM) is developed using CFD and we inquire into the factor which causes increase of T10/T value as LW ratio increases. And the effect of shape on the relation of LW ratio and T10/T is analyzed. As LW ratio increases, internal short-circuiting index (ISI) of influent and effluent zone is rapidly reduced and recirculation and dead zone are reduced in channel zone. Therefore, as the T10/T value converges maximum value, ISI curve is changed from "V" shape to "U" shape and hydraulic efficiency is improved especially in downstream portion of clearwell. The less the shape ratio(width/length of clearwell) is the less the T10/T value is at a same LW ratio because the portion of turning zone increases as shape ration decreases, therefore more boundary separation is generated.

참고자료

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