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Silt density index filter pads

Silt density index (SDI) is a test that measures the potential of an influent water to foul an RO membrane with suspended solids and colloids. The test involves timing flow of the influent water through a 0.45-micron filter pad.5... [Pg.35]

Figure 3.7 Silt density index pads taken before and after a filter treating RO influent water. Figure 3.7 Silt density index pads taken before and after a filter treating RO influent water.
Silt Density Index (SDI) It is an empirical measurement ASTM Standard D-4189-82, 1987) used for measuring the colloidal fouling potential of RO/NF feed water. It is not a direct measure of the particle concentration, which is more properly measured by turbidity. The SDI value is based on the time required to filter a volume of feed water throu a 0.45 pm filter pad at a feed pressure of 2.1 bar g. The SDI value is calculated from the formula ... [Pg.378]

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