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The lime feeder water flow rate required for the experiment was calculated with Mathcad. The analysis was made according with the dosage of lime, the operation time, water velocities, water pH and other variables, most of them were taken from the previous team report.
But in actual condition, even if we made the flow rate in lime feeder keeps constant, but the flow rate of plant can still change in a considerable degree in operation, so we have to figure out what will this affact on pH and ANC. We assume the effluent pH of limefeeder is constant at 12.4, and the flow rate between lime feeder and plant changes from 10^(-5) to 0.01, the raw water condition we still use the hardness provided by the previous team report that could make the assesment comparable to our caculation of lime feeder demand based on the same raw water hardness, which is 0.02gm/L. We want to find the change of ANC and pH of raw water in the plant sensitivity to this ratio between flow rate(see figure 1.).
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