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Suspended Solids in Water (TDS) Education
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Suspended Solids in Water (TDS) Education
Technical explanation
Suspended solids:
Suspended solids and colloidal matter in water supplies are one of the biggest problems in water treatment technology. Although most water treatment systems have some pre-treatment equipment, such as a 5-micron pre-filter, these fine particles can still cause scaling of the reverse osmosis membrane. To get some measure of the extent of this pollution problem, we use a measurement technique called the SDI density index. Using this technique, we expose a 0.45 micron screening membrane disc to the pressure of a water supply and calculate the filtration rate.
For reverse osmosis systems, an SDI of less than 5 is considered acceptable. This means that at SDI values below 5, the membrane should foul at a very low rate. Even though this principle applies most of the time and in most applications, there are exceptions when a lower SDI (less than 3) is desirable, depending on the nature of the suspended solids in the water supply.