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Last semester I worked with foam filter preflocculation team. I We designed and build a bench-scale foam filter with tube flocculator. Together with my teammates we conducted over 40 tests and the conclusions are summarized below.
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When comparing foam filter with StaRS sand filter, the foam filter ran longer than the sand filter at similar flow rate, and the solid loading capacity of foam is greater than sand. But sand filter have higher pC*. We also found that the runtime and loading capacity of foam filter at a low flow rate is much longer than that at a high flow rate. This could be due to less shear exerted on the pores than at higher velocities. This suggests if possible, a lower approach velocity can lead to a better performance of the filter in real world application.
This semester I am working with High rate UASB team.