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9.7 OVERVIEW OF MEMBRANE PRODUCTS USED FOR SALINE WATER PRETREATMENT 215 TABLE 9.7 GE ZW Seawater Pretreatment Membranes
Parameter/Membrane Module
Module configuration
Number of modules per cassette/rack (maximum)
Cassette width/module diameter Cassette height/module length Membrane area
Fiber inner diameter, mm
Fiber outer diameter, mm
Maximum feed pressure
pH operating range
Weight per cassette/module
Suitable for pump-through configuration
ZW1000-V2
Horizontal installed in cassettes
96
2.11 m (6.9 ft) 2.54 m (8.3 ft) 37.2 m2(400 sq ft)
0.4
0.7
0.69 bar (9.7 psi) 2.0e10.0
1007 kg (2200 lbs) No
ZW1000-V3
Horizontal installed in cassettes
96
1.82 m (6.0-ft) 2.60 m (8.5 ft)
46.5 and 55.2 m2 (500 and 594 sq ft)
0.5
0.8
0.69 bar (9.7 psi) 2.0e10.0
1007 kg (2200 lbs) No
ZW1500
Vertical installed in polyvinyl chloride housing
192
18 cm (7 in.)
1.75 m (69 in.) 55.7 m2 (600 sq ft)
0.47
0.95
3.8 bars (55 psi) 2.0e10.0
22 kg (50 lbs) No
Dow
SPF-2860 Vertical 0.03 mm 75
22.6 cm (8.9 in.) 1.82 m (71.7 in.) 50.4 m2 (549 ft2) 6.5 bars (94 psi) 2.0e12.0
Yes
TABLE 9.8 Toray, Pall, and Dow Seawater Pretreatment Systems
Parameter/Manufacturer
Model of membrane element (module) Module configuration
Nominal pore size
Number of modules rack (maximum) Module diameter
Module length
Membrane area
Maximum feed pressure
pH operating range
Suitable for pump-through configuration
Toray
HFUe2020N Vertical
0.01 mm
75
22.0 cm (8.5 in.) 1.78 m (70 in.) 71.1 m2 (775 ft2) 5.0 bars (72 psi) 2.0e13.0
Yes
Pall
UNA620A Vertical 0.10 mm 75
16.5 cm (6.5 in.) 2.22 m (87.2 in.) 49.4 m2 (538 ft2) 5.0 bars (72 psi) 2.0e12.0
Yes
Toray pressure-driven modified PVDF UF and MF membranes; Dow pressure-driven UF PVDF membranes; Koch pressure-driven PS UF and Pall/Asahi Aria pressure-driven MF membranes. Key performance parameters of the Toray, Pall, and Dow membrane elements that have found applications for pretreatment of seawater are shown in Table 9.8.