Apparatus Changes
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Unknown macro: {toggle-cloak} Concerns">Unknown macro: {toggle-cloak} Concerns
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The Tube Floc research team has known for a while now that sedimentation was occurring within the flocculator and that such premature sedimentation was bad. The switch from a horizontally coiled flocculator to a vertically coiled one was made partly to try to overcome this issue. Throughout the Fall 2007 semester, the Lab Floc team performed numerous experiments with the flocculator apparatus despite not having completely eliminated sedimentation. It seemed, at the time, that the sedimentation accrued per run was minimal and that it would not contribute a significant amount of error into our measurements. Further investigation by the Lab Floc team this semester, however, has given new light into the significance of this premature sedimentation as well as a new problem of fluid circulation inside the settling column immediate after the termination of flow through the apparatus. These issues are significant not only because they are unexpected and are not optimal experimental conditions, but they also put into question the validity of the data obtained last semester and the method by which we have been analyzing and describing these past results. Below are more detailed discussions of the different aspects of these problems.
Unknown macro: {toggle-cloak} Progress">Unknown macro: {toggle-cloak} Progress
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NewSetup">Unknown macro: {toggle-cloak}
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New Setup
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In order to prevent premature sedimentation in the flocculator, we have changed the flocculator setup. The flocculator hollow PVC tube (black) has been replaced with a peg board by which the team can plug in pegs to wrap the flocculator tube around. The board is 75 inches tall by 35 inches wide and is supported by a wooden brace to stand vertical.
The flocculator tube wraps around 10 different pegs that form semi-circles on the vertical ends of the board. The 50 foot flocculator tube wraps around these pegs about three times between rapid mix and the settling column.
If the team wanted to shorten the vertical distance that the tube wraps around, it is an easy transition by just replacing the pegs to a different hole on the board. This new setup is convenient and provides a lot of different ways to achieve a vertical flocculator.
This new setup reduces the amount of horizontal pieces in the flocculator, and will hopefully reduce or remove the amount of settling altogether.
Unknown macro: {toggle-cloak} DataAnalysis">Unknown macro: {toggle-cloak} Data Analysis
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Data Analysis for the new flocculator setup can be viewed here.
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