Experiment 5: Alum dose = 105 mg/L
This is an overdose. The graph below shows the effluent turbidity plotted against time for capture velocities of 0.058, 0.116, 0.174, and 0.231 mm/sec, for the low floc blanket level only.
Figure 1: Effluent Turbidity vs. Time for Floc Blanket on low, alum dose = 105 mg/L
Conclusions
This extremely high dose was tested to show what a failure looks like (the turbidity is greater than 1 NTU). The effluent turbidity is much higher than one, meaning this is a good demonstration of failure.