DuPont dupont UF membrane ultrafiltration SFP2880 system performance is standardized
The temperature of the influent water affects the permeability of the ultrafiltration membrane filtration system. The viscosity of water increases with decreasing temperature (approximately 3% for every 1 decrease in temperature).
When the transmembrane differential pressure (TMP) is constant, the decrease of the inlet water temperature will lead to an increase in the resistance through the membrane, which in turn will lead to a decrease in the membrane flux. Correspondingly, to maintain a constant membrane flux, the differential pressure across the membrane needs to be increased. Therefore, the viscosity effect caused by this temperature effect should be considered in the design of the membrane system to ensure sufficient water production capacity under all water temperature conditions and to ensure that the corresponding energy consumption is foreseen.
"Standardization of system performance" is an industry practice to correct for various variables. Changes in these factors may result in changes in membrane flux or differential pressure across membranes, which may lead to misunderstandings about the operational performance of the membrane system (e.g., a decrease in membrane permeability (i.e., flux divided by differential pressure across membranes) due to a drop in water temperature alone is misinterpreted as fouling of the membrane).
ASTM D5090 provides a technical basis for achieving performance standardization, but membrane vendors generally adjust this technology based on the characteristics of the membrane system itself to make it more consistent with the characteristics of the membrane product in terms of fiber structure and field operation.
The purpose of system performance standardization is to eliminate the influence of temperature on operating data during the operation of the membrane system, so that any deviation or change in membrane performance under the same operating conditions (e.g., the same inlet water quality, the same filtration time, and the same frequency of backwash and chemical cleaning) can be linked to membrane fouling.
DuPont ultrafiltration uses 25 C as the base temperature for data normalization.