Figure 1: Effluent Turbidity vs. Time, Floc Blanket on Low, Alum dose = 65 mg/L
Figure 2: Effluent Turbidity vs. Time, Flock Blanket on High, Alum dose = 65 mg/L
An alum dose of 65 mg/L is considered to be an over dose.
Figure 1: Effluent Turbidity vs. Time, Floc Blanket on Low, Alum dose = 65 mg/L
Figure 2: Effluent Turbidity vs. Time, Flock Blanket on High, Alum dose = 65 mg/L
For the Floc Blanket at both the lower and higher levels, the capture velocity of .058 mm/s produces a lower effluent turbidity than the Vc = .116 mm/s, and Vc = .174 produces a higher effluent turbidity than Vc = .116 mm/s, which is expected. However, Vc = .231 mm/s produces a lower effluent turbidity than Vc = .174 mm/s.
(Your figures 1 and 2 on this page are the same. Please find which is which and put in the appropriate figures. Specify what you think is happening between 0.231 mm/s and 0.174 mm/s. You've seen this before. We also see a decrease in turbidity at the end of the graph. It seems like something is going on here that is predictable.)