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The original Chemical Dose Controller (CDC) 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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Try to use consistent nomenclature for each part. I ran into a lot of trouble writing about the CD because I was calling each part something different on each page. Also you should add a picture here. There are labeled ones on Linear Chemical Doser |
The vertical drop chemical dosing tube portion of the CDC was tested with various tubing diameters to determine the failure point. If free fall or open channel flow was observed within the vertical drop tubing, then the dosing would be accurate. We determined that the smallest allowable inner tubing diameter is one quarter inch.
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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.
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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