Abstract
Mixing coagulant and water can take advantage of the turbulence that occurs when a hydraulic jump occurs in a channel. The hydraulic jump occurs due to the difference in slope of the two segments in a channel. In a hydraulic jump (water jump), the flow velocity decreases suddenly from V1 to V2. Correspondingly, the flow depth also increases rapidly from y1 to y2 (Triatmodjo, 2003). The use of hydraulic jumps is relatively cheaper because it does not require a stirrer such as a motor or air pump.
 The hydraulic jump used comes from the size of the gate valve opening at the outlet of the water reservoir. The research variation is a combination of gate valve openings (60o, 80o, 90o); coagulant injection point (X=before the jump, Y=when the jump, Z=after the jump); settling time (10, 20, 30 minutes).
 The results showed that the efficiency of turbidity removal using hydraulic jumps as a coagulator of the water purification process with aluminum sulfide was 74.2% from the initial turbidity of 81.6 NTU to 19 – 23.3 NTU. The effectiveness of the use of hydraulic jumps on the use of the impeller method as a cogulator is 83%.
 Keywords: hydraulic jump, gate valve opening
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