h1. Experiments 1 and 2 - Replicates of the Previous Fluidized Bed Experiments

h2. Parameters:

For both Experiment 1 and Experiment 2, the [general procedure|Evaluation of Previous Experiments] had been followed using specific parameters. The parameters used in each experiment are listed and compared below:
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h5. Table 1: Comparison of Parameters Used.
||Parameters:||Experiment 1||Experiment 2||
|Sand Grain Type|Sand 40|Sand 30|
|Sand Grain Diameter|0.42 mm - 0.59 mm|0.59 mm - 0.84 mm|
|Sand Bed Depth|60 cm|60 cm|
|Sand Bed Expansion|50%|50%|
|Aerator Air Pressure|100 kPa|100 kPa|
|Flow Rate|225 mL/min|485 mL/min|
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h2. Results and Discussion:

Data from both experiments were analyzed using the method outlined below:
For each sand grain size, the experiment was run for a certain amount of time, throughout which it completed several data collection periods. Each data collection period ("run") represents a time period during which the water level in bubble collector gradually falls down from its maximum to the set minimum point. In Figure 1. and Figure 2. this period is represented on the graph when the line slants downward. Once the minimum water level is reached, the bubble collector has to refill with water in order to continue the runs. For this reason, the water outflow valve is closed until the water level reaches the set maximum point. This period is represented on the graph by the vertical lines. More detailed information on the bubble collector setup can be found [here|Floating Flocs Summer 2009 Set-up].
Once the change in water level in the bubble collector was recorded, we added the linear fit line to each of the runs to see the rate of change of the water level inside the bubble collector when water runs through the sand filter. Figure 3. and Figure 4. show the linear fit line for the second data collection period in both experiments, and more detailed graphs can also can be found [here|Gas Removal Preliminary Graphs].