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Looking at the gamma pdf graph (Figure 5A), all of the alum dosages give a similar distribution to each other, which our lowest mean effluent turbidities were in range from ~1.441 to 1.559 NTU. Figure 5A also shows us that at lower dosages we get the same distribution profile for higher sedimentation velocity range, and a lower mean effluent turbidity. Figure B, the, the residual turbidity graph showed a correlation to Figure A in that the highest resulting turbidities were due to alum dosages of 30 mg/L and 35 mg/L. Over all the mean turbidities seemed to settle at higher and higher effluent turbidites as alum dosage increased.

5A

5B
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FIGURE 5A: The graph plots normalized turbidity vs. sedimentation velocity for each Alum dose ranging 20 mg/L~55 mg/L; FIGURE 5B: The graph plots the residual turbidity vs. sedimentation velocity for each Alum dose ranging 20 mg/L~55 mg/L

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As shown in Figure 7A, there is no big differences between the floc size distribution except for the lowest alum dose. As the previous experiment (500 NTU, length 2796 cm), the distribution is narrow wich means that we are producing flocs of almost the same size. Besides, the mean floc size seems to be the same than previously.

7A

7B

FIGURE 7A: The graph plots normalized turbidity vs. sedimentation velocity for each Alum dose ranging 10 mg/L~90 mg/L; FIGURE 7B: The graph plots the residual turbidity vs. sedimentation velocity for each Alum dose ranging 10 mg/L~90 mg/L

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