Sedimentation Prototype Final Report
Introduction
Methods
Schematic
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Schematic of Apparatus Setup
Initial Apparatus Setup
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Initial Apparatus Setup
The initial apparatus set up was run by Process Controller which had functions set in place for when the system would turn on, off, or drain. It also included a pressure sensor that would control the flow rate of the system. It was found that the pressure sensor was unreliable and sensitive to changes in the environment. Additionally, the flocculator for this setup led to a high velocity gradient (G) of 129.1/s. This led to the formation of very small flocs.
New Apparatus Setup
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New Apparatus Setup
In the New Apparatus Setup the diameter of the flocculator was increased. This allowed for an increase in floc size and a significantly lower velocity gradient (G) of 35.7/s. Additionally, the flow control system was changed to utilize a peristaltic pump allowing for a more stable system.
Design Parameters
Equations
Critical Settling Velocity
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Velocity Gradient
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Residence Time
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Length and Diameter Values
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Table 1: The data above shows length(L), diameter(D), and ratio of L/D values for each straw setup.
Critical Settling Velocity Values
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Straw Bundles
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Type 1 Straws - 12mm
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Type 2 Straws - 5mm
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Type 3 Straws - 3mm
Results & Discussion
Matrix of Experiments
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Experiment Obstacles
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Floc Blanket
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Clogged Straws
Experimental Trials
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