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This experiment will attempt to examine the fluidized bed expansions for a filter media under varying flow rates, with other parameters held constant. We will adjust bed expansion by adjusting the flow rate through the sand filter. Expansion of a bed of sand affects the distance that the gas molecule has to undergo to reach a solid surface. Consequentially, this affects the bubble formation process. By conducting this experiment, the team hopes to quantify the relationship between the bed expansion at a certain flow rate and gas removal to find optimal conditionals of bed expansion in the sand filter. Presently, we are considering using Sand 40 with a grain diameter 0.42 - 0.59 mm. The range of expansions to be tested will be determined after the bed depth experiments are conducted. A bed depth that yields moderate gas removal will likely be chosen and the physical limitations of the sand column will govern the expansion range.

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