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Also, as we evolve to build larger plants, the Linear Chemical Dose Controller (LCDC) won't be able to provide a sufficient dose of chemicals to treat the larger flow rates. The CDC team from past semesters has found that the LCDC can only provide chemical flows up to 400mL/min, which is too low for larger plants. Linear dose control depends on a change in head in the plant inflow tank to move a float up and down, which changes the flow of alum into the water. Thus, a Nonlinear Chemical Dose Controller (NCDC), where flow will not vary linearly with water height like the LCDC, is needed for bigger plants. A discussion of the need for a NCDC can be found in the second paragraph on the NCDC page. This summer we will need to improve upon the initial design of a NCDC in order to make it more dependable and robust.
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