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The original Chemical Dose Controller (CDC) is CDC was designed to have a linear relationship between the flow of alum and the height of water in the entrance tank. The CDC itself is a combination of three previous subteams: the Linear Flow Orifice Meter; the Linear Chemical Doser; and the Flow Controller. These three devices work together to automatically change the amount of alum that enters rapid mix as the flow through the plant is increased. A description of these devices, and how they work can be found below. Since the linear CDC is currently in use in Honduras, the current goal for this Spring was project is to make the design more robust.
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The Linear Flow Orifice Meter riser pipe, LFOM, is located in the entrance tank. It is used in the plant when chemical dose flows are laminar. The LFOM tank creates a linear relationship between the flow rate through the plant and the height of water in the entrance tank so that a float system can be used control the chemical dose.
Linear Chemical Doser
The Linear Chemical Doser creates a directly proportional relationship between the plant inflow tank water level and the flow controller outflow tubing level.
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