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Figure 3 shows the three ramp states as a function of flow rate. The first ramp state has a significantly higher turbidity than the following two. This suggests that this film may have an effect on the performance of the filter. In order to prove or disprove this, experiments will be run with the filter column on its side so this film is unable to perform, and by comparing these results, we will find out the importance of the film layer.
Figure 3: Effluent Turbidity vs. Flow Rate
After it was determined that the film that forms on top of the foam sheets affects performance, it was necessary to test and see if foam filtration is actually a function of depth: Depth Filtration