Ridwan Ridwan Ridwan - ۱ Department of Environmental Engineering, Faculty of Engineering, Universitas Andalas, Padang, Indonesia

The research aims to determine the effect of continuous discharge flow (CDF) on the settling zone in the sedimentation unit as a new method for enhancing turbidity removal efficiency. The research using a laboratory-scale reactor with a capacity of ۲۴۰ liters/hour for ۶ hours. The reactor consists of a coagulation unit with a waterfall and detention time of ۵ seconds and uses alum as a coagulant. Perforated walls flocculation unit with a detention time of ۳۰ minutes, and a sedimentation unit of the CDF method with a detention time of ۱ hour. The research conducted ۴ variations of the CDF, which is ۰%, ۲%, ۴%, and ۶% with the initial turbidity of raw water in the Sungai Batang Kuranji Kota Padang being ۲۳.۶۱ NTU. Turbidity in sedimentation unit outlets ranged from ۴.۱۶ to ۵.۹۸ NTU with a maximum turbidity removal efficiency of ۶% CDF was ۸۲.۳۸%. Statistical analysis showed a very strong relationship between variations in CDF values ​​with turbidity removal efficiency, that is the correlation value of ۰.۹۸۸ and the significance value of ۰.۰۰ < ۰.۰۵. At ۶% CDF, the flow in the settling zone was laminar with NRe values ​< ۲,۰۰۰ and NFr > ۱۰-۵The research aims to determine the effect of continuous discharge flow (CDF) on the settling zone in the sedimentation unit as a new method for enhancing turbidity removal efficiency. The research using a laboratory-scale reactor with a capacity of ۲۴۰ liters/hour for ۶ hours. The reactor consists of a coagulation unit with a waterfall and detention time of ۵ seconds and uses alum as a coagulant. Perforated walls flocculation unit with a detention time of ۳۰ minutes, and a sedimentation unit of the CDF method with a detention time of ۱ hour. The research conducted ۴ variations of the CDF, which is ۰%, ۲%, ۴%, and ۶% with the initial turbidity of raw water in the Sungai Batang Kuranji Kota Padang being ۲۳.۶۱ NTU. Turbidity in sedimentation unit outlets ranged from ۴.۱۶ to ۵.۹۸ NTU with a maximum turbidity removal efficiency of ۶% CDF was ۸۲.۳۸%. Statistical analysis showed a very strong relationship between variations in CDF values ​​with turbidity removal efficiency, that is the correlation value of ۰.۹۸۸ and the significance value of ۰.۰۰ < ۰.۰۵. At ۶% CDF, the flow in the settling zone was laminar with NRe values ​< ۲,۰۰۰ and NFr > ۱۰-۵

Sedimentation continuous discharge flow method, Froude's number (NFr), Reynolds number (NRe), Efficiency, Turbidity