Variable frequency drives (VFDs) are nothing new to membrane filtration units. The most typical use of an external VFD on pressure pumps for reverse osmosis (RO) or ultra-filtration (UF) systems is to account for variability in flow. However most end-users see their application as having a constant flow requirement, such as treating water for a boiler system or a constant flow process; the majority of membrane systems are supplied with fixed speed pumps.
With increasing concern for energy costs, and the growth in integrated motor drives, it is time to look again at using drives for your membrane system pumps. Here are several benefits a VFD or integrated motor-drive solution can benefit your membrane system.