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TABLE 9.5
Parameter
Module configuration Number of modules
per pressure vessel (housing)
Module length Module diameter Membrane area
Fiber inner diameter, mm
Fiber outer diameter, mm
Maximum feed pressure
pH operating range
Weight per module (dry)
Suitable for inline configuration
9. MEMBRANE FILTRATION Pentair X-Flow Pretreatment Systems
Seaguard 64 and 55
Horizontal 2e4
1.54 m (60-in.) 220 mm (8.7-in.)
64 & 55m2
(689 and 592 ft2)
0.8
1.3
8 bars (116 psi) 2e12
34 kg (75 lbs) Yes
Seaguard 40
Horizontal 2e4
1.54 m (60-in.) 200 mm (8.0-in.) 40 m2 (430 ft2)
0.8
1.3
8 bars (116 psi) 2e12
25 kg (55 lbs) Yes
Seaflex 64 and 55
Vertical
1 (no separate housing)
1.54 m (60-in.) 220 mm (8.7-in.)
64 and 55 m2 (689 and 592 ft2)
0.8
1.3
3 bars (43 psi) 2e12
34 kg (75 lbs) No
Seaflex 40
Vertical
1 (no separate housing)
1.54 m (60-in.) 200 mm (8.0-in.) 40 m2 (430 ft2)
0.8
1.3
3 bars (43 psi) 2e12
25 kg (55 lbs) No
used in RO vessels) and the UF vessels are fed from both ends with a dead end at the center of the vessel. This configuration is driven by the fact that because of the high fluxes at which these systems operate, flow distribution within the vessels is even worse than that in RO systems and the fourth element in sequential UF configuration will be used very inefficiently (i.e., will have very low productivity). To address the uneven hydraulic distribution within the vessels (hous- ings) X-Flow/Pentair have incorporated bypass tubes within the vessels.
The horizontal (Seaguard) design allows for a more efficient use of the height of existing buildings because a number of vessels can be added vertically at the same basic footprint. This system also has fewer valves and overall shorter interconnecting piping.
The vertical (Seaflex) configuration has a better flow distribution within its single vessel, which allows the system to be designed at 10%e12% higher flux at comparable membrane surface area. The vertical membrane configuration also allows an easier and better membrane cleaning and flushing. Table 9.5 provides a summary of the key design parameters for these systems.
9.7.2 Memcor (Evoqua)
Memcor (Evoqua) have both vacuum- and pressure-driven membrane systems, which are divided into two lines of products, “Xpress” or “X” for small package systems and “Compo- nent”, “C”, engineered systems designed to serve plants with a production capacity of over 4000 m3/day (1.1 MGD). Both the “X” and the “C” modules are available in pressure driven (XP and CP) and submerged configurations (XS and CS). All membranes are made of PVDF