Application of Continuous Discharge Flow (CDF) as a New Method in The Sedimentation Unit for Removal of Raw Water Turbidity

Abstract

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 240 liters/hour for 6 hours. The reactor consists of a coagulation unit with a waterfall and detention time of 5 seconds and uses alum as a coagulant. Perforated walls flocculation unit with a detention time of 30 minutes, and a sedimentation unit of the CDF method with a detention time of 1 hour. The research conducted 4 variations of the CDF, which is 0%, 2%, 4%, and 6% with the initial turbidity of raw water in the Sungai Batang Kuranji Kota Padang being 23.61 NTU. Turbidity in sedimentation unit outlets ranged from 4.16 to 5.98 NTU with a maximum turbidity removal efficiency of 6% CDF was 82.38%. Statistical analysis showed a very strong relationship between variations in CDF values ​​with turbidity removal efficiency, that is the correlation value of 0.988 and the significance value of 0.00 10-5