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After testing the filtering capacity of the 60 ppi foam, 90 ppi foam was tested in hopes of achieving a higher filtration performance. Rather than testing the foam at constant flow rates, as done previously, a ramp state was employed. Over the course of a 24 hour period, the flow rate through the foam sheet was gradually increased from 50 m/day to 250 m/day. This variation of flow rates will indicate whether the filtering capacity of the foam is affected by flow rate or not. As with the tests conducted on the 60 ppi foam, raw water of 5 NTU without alum dosage was used.

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_Figure 1: Raw Water and Effluent Turbidity vs. Flow Rate

A few things to note about Figure 1:

• The effluent turbidity is approximately constant at 1.5 NTU, despite the varying flowrate.
• The effluent turbidity is about the same as the 60 ppi.
• The clay stock ran out for this experiment around the mark for 130 m/day, therefore the data collected after this point is not applicable to the flow rate experiment.

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Figure 2: PC* vs Flow Rate

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