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h2. Methods
In this experiment, we seek to determine what direct impact the diameter of the tube settler has on sedimentation efficiency. From the experiment detailed on the previous page, we were able to identify a range of capture velocities that produce low turbidity effluent regardless of tube diameter. For this experiment, we chose three capture velocities within this range and adjusted the length of the tube settlers to satisfy this velocity. Upflow velocity through the tubes were held constant. Recall that {latex}\large\[V_c = \frac{{dV_{up} }}{{L_{tube} \sin (\alpha )\cos (\alpha ) + d}}\]{latex} is the capture velocity equation.
As the capture velocity equation above indicates, holding the capture velocity constant and varying the length to satisfy this velocity, allows isolation of the diameter of the tube as the parameter that should most directly impact settling efficiency.
h2. Results
_Work in Progress_ |
Methods
Capture velocity is presumed to be a robust parameter for optimizing sedimentation efficiency because it is dependent on tube settler geometry, flow rate through the tubes, and the angle of tilt. To begin to test the validity of this presumption, we will hold capture velocity constant while varying the inner diameter of the tube settlers. To maintain a constant capture velocity, we will hold the flow rate through the tubes constant and vary the tube length accordingly.
This experiment is expected to reveal the importance of the inner tube diameter of the tube settlers relative to capture velocity. It is possible that while the system is running at a certain capture velocity, the effluent turbidity will still vary as the inner diameter of the tubes vary. This would indicate that sedimentation efficiency is more dependent on diameter than capture velocity.
We will test the capture velocity that facilitates optimum sedimentation efficiency based on the results from the first experiment detailed on the previous page. We will choose the optimum capture velocity so that the impact of inner tube diameter will be significantly tested. We will run experiments at both the low and high floc blanket depths.
Results
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