Silt Density Index Test Kits
Silt Density Index (SDI) is an empirical test developed for measuring the rate of fouling of nano filtration (NF) or RO membranes.
Silt Density Index Test Kits
- Silt Density Index
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Suspended solids and colloidal materials in feed water are one of the biggest problems in reverse osmosis systems. Although most systems have some pre-treatment, including 5-micron pre-filters, these fine particles are responsible for the fouling of reverse osmosis membranes.
In order to measure the degree of this fouling problem, a concept called Silt Density Index is used. Here filtration rates are calculated by exposing a 0.45-micron filter to the feed water under pressure.
An SDI of less than 5 is typically considered acceptable for the reverse osmosis systems. This means membranes should foul at a very low rate at SDI values of less than 5. Although this concept works most of the time, there are exceptions when a lower SDI (less than 3) is desirable due to the nature of the suspended solids in the feed water.
There is no direct correlation between turbidity of a water stream and its SDI. Experience has shown that water with a very low turbidity (< 1 NTU) may have a high SDI value.
SDI001 Kit
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- Operation, SDI represents the potential for fouling of the membranes by finely suspended particles present in feed water to the membranes.
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