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214 9. MEMBRANE FILTRATION
FIGURE 9.10 GE ZeeWeed vacuum-driven ultrafiltration (UF) membrane system.
by having relatively smaller fiber packing densitydthe product design is tailored for waste- water applications. The V3 version of ZW1000 has higher inner diameter fibers than the V2 version (0.5 mm vs. 0.4 mm), which allows to reduce TMP and to increase membrane produc- tivity. These performance benefits make the ZW1000-V3 membranes likely the most suitable product for waters of lower solids content such as seawater applications with relatively deeper open intakes.
GE Zenon also offers pressurized, outside-in membrane product referred to as ZW1500. This module has a significantly higher fiber length than the ZW1000 elements (1.7 vs. 0.6 m) and is designed to operate at a maximum TMP of 2.75 bars. This pressure module has a diameter of 180 mm (7 ft) and a total membrane area of 55.7 m2 (600 ft2). Table 9.7 pre- sents the key performance parameters of the ZW1000, V2, and 3 and ZW1500 elements, which are typically offered for desalination plant pretreatment applications.
9.7.5 Other UF and MF Membrane Products
Other commercially available membrane products used for pilot and full-scale desalina- tion projects include the following: Hyflux and Inge pressure-driven PES UF membranes;