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The effluent turbidity standard deviations in for both the top and bottom positions have a large range (Figure Figures 1 and 2), and there is a trend of increasing standard deviations as the settling state time increases. The max maximum standard deviation for the effluent turbidity when the turbidimeter was in its standard position (top) is 12.4. The max maximum standard deviation for the effluent turbidity when the turbidimeter was in its new position (bottom) is 14.2. The As expected, the influent turbidity standard deviations in both positions are generally consistently lower than the effluent turbidity standard deviations, and maintain at low values. We expect this because the deviations from the mean are a result of large flocs moving in and out of the sample volume.
These results definately show us some insights into our data. We see that the settling data in one experiment will not be the same as in the next experiment (when all variables of the experiment remain the same). From the data, it appears that there is no significant difference from having the turbidimeter position at the top or at the bottom of the column, except for the slight increase in the max standard deviation of the effluent settling turbidity, and the increase in range of effluent turbidity standard deviation values. For example, the standard deviation values at the end of the settling time in the top position experiment ranges from 2 to 12, whereas the range of the standard deviation values at the end of the settling time in the bottom position experiment ranges from 5 to 15.
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