Effects of pulsation rate, surface overflow rate and suction height on the turbidity removal efficiency of pulsator clarifier

Abstract

The main objective of this research was to study the turbidity removal efficiency for raw water at Mahasawat water treatment plant by using pulsator clarifier model. A bench scale with a continuous operation was used to determine the optimum treatment by varying pulsation rate (6, 10 and 14 m/hr), surface overflow rate (2.90, 3.22 and 3.54 m/hr), and suction height (0.40, 0.60 and 0.80 m). Results indicated that the pulsation rate under these experimental ranges is not a directly important operating factor influencing the turbidity removal efficiency of the water treatment process. The surface overflow rates and suction heights are the important operating factors influencing turbidity removal efficiency. The study showed that when the surface overflow rates and the suction heights increased, the turbidity removal efficiency tended to decrease. The optimum turbidity removal conditions were at the pulsation rate of 14.00 m/hr, surface overflow rate of 3.22 m/hr and the suction height of 0.6 m. Under these conditions, the turbidity removal efficiency was 95.47 %. The turbidity of clarified water after treatment was 1.09 Nephelometric Turbidity Unit (NTU), which was lower than 5 Nephelometric Turbidity Unit (NTU) for normal plant operation condition.;"วัตถุประสงค์หลักของงานวิจัยนี้เพื่อศึกษาประสิทธิภาพการลดความขุ่นจากน้ำดิบที่โรงงานผลิตน้ำมหาสวัสดิ์โดยใช้แคลริฟายเออร์แบบพัลเซชั่นที่จำลองขึ้นซึ่งเป็นการศึกษาวิจัยเชิงทดลองแบบปฏิบัติการต่อเนื่องเพื่อหาสภาวะที่เหมาะสมในการลดความขุ่นโดยแปรค่าอัตราพัลเซชั่นเท่ากับ 6