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Looking at the gamma pdf curve(Figure 2B) we see that trace 1 which corresponds to an alum dosage of 50 10 mg/L has a really high turbidity rate of 1.171 NTU which is unusually higher than all the others, and demonstrates a smaller distribution. There seems to be varied ranges of mean turbidities depending on the alum dosage. Seems as though with higher dosages comes higher residual turbiditiesvery narrow distribution. However, looking at the residual turbidity graph (Figure 2B), the resultant turbidity this dosage gave did not differ significantly from all the others. In fact trace 7 (corresponding to an alum dosage of 40 mg/L seems to give in the highest resultant turbidity at this range of sedimentation velocity we are looking at. Figure 2B also shows that for traces 2 and 4 (alum dosages of 15 and 25 mg/L, respectively) have wider distributions than the other alum dosages. Overall there seems to be discrepencies between the data correlating cohesively between the two graphs. From the values of mean turbidity at settling state, from 10 to 45 mg/L the mean turbidity seemed to start at a value of .608 NTU then rise to about .725 at 25mg/L, then rises to .829 and then back down to .755 at 35 mg/L (Table 1).

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2B

FIGURE 3A: The graph plots normalized turbidity vs. sedimentation velocity for each Alum dose ranging 10 mg/L~50 mg/L; FIGURE 3B: The graph plots the residual turbidity vs. sedimentation velocity for each Alum dose ranging 10 mg/L~50 mg/L

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