Unscreened feed

Figure 9. Unscreened feed for axial filtration plugging of 1.2-iim Nuclepore filters by filtrate from 5-jim Nuclepore filter mounted on axial filter (plugging test pressure...

Figure 11. Unscreened feed comparison of viscosities of feed and filtrates from axial filtration (25 °C axial filtration through S-ftm Nuclepore filter)...

The screened broth was then compared with unscreened broth in polishing by the axial filter wrapped with 5 ym Nuclepore membranes. Figure 8 compares the fluxes. Neither are as high as one might hope, though the screened feed values appear... 

Figures 11 and 12 compare the viscosities of the axial filtration effluents and feeds for the screened and unscreened broths. Here there is a clear advantage of the screening step. There is little decrease of viscosity between feed and filtrate for the screened material, but about a 25% decrease for the unscreened. There are sometimes decreases in viscosity Incurred from diatomaceous earth filtration.

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