A large American leader in the Food & Pharma industry approached Evoqua inquiring about the unique Vortisand Cross-Flow Microsand Filtration technology. The application called for pretreatment of a reverse osmosis membrane system. Designers had evaluated several other technologies, including ultraﬁltration and cartridge ﬁlters, but only the Vortisand system offered the combination of value, performance and small footprint that the designers were seeking.
Fouling of a reverse osmosis membrane can seriously harm the ﬁltration system, ultimately reducing the life of the system while incurring added cleaning costs. A pretreatment system can help to not only extend the life of a reverse osmosis membrane, but ensure the ﬁltration system is operating at its designed efﬁciency. The best available technology for determining the fouling potential of a reverse osmosis system is by measuring the inlet’s Silt Density Index (SDI). SDI measurements need to be taken prior to designing an RO pre treatment system. Raw water SDI values, measured multiple times during a 60 day period, averaged just over 4. The ﬁltration challenge was clear!
Thanks to its submicron ﬁltration performance, high flow capabilities and compact design, the Vortisand system was selected.
After startup the customer experienced an average SDI reduction of 1.3*, ultimately decreasing the concern for fouling, while reducing potential maintenance costs and increasing the membrane’s life cycle.