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The MBR Book: Principles and Applications of Membrane

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190 <strong>The</strong> <strong>MBR</strong> <strong>Book</strong><br />

Figure 4.31 Norit X-Flow membrane, showing support on the left <strong>and</strong> active membrane surface on the right<br />

4.4.2 Norit X-Flow<br />

Figure 4.32 <strong>The</strong> Norit X-Flow MT 38PRH F4385 module<br />

Norit X-Flow is a major supplier <strong>of</strong> MT <strong>and</strong> capillary tube (CT) membrane modules,<br />

the latter thus far being dedicated to potable water filtration. <strong>The</strong> tubular membrane<br />

is supported by a mechanically robust substrate (Fig. 4.31) by a two-fold polyester<br />

backing. <strong>The</strong> membrane material itself is either PES for the CT configuration,<br />

�3 mm external diameter, or PVDF for the MT type used for s<strong>MBR</strong> technologies.<br />

<strong>The</strong>se membranes comprise type F4385, 5.2 mm i.d., <strong>and</strong> type F5385, 8 mm i.d., each<br />

having a pore size <strong>of</strong> 0.03 �m. <strong>The</strong> PVDF MT modules are supplied as both PVC (38PR)<br />

or glass fibre reinforced (38GR) shells. At 3 m in length, the respective total membrane<br />

area <strong>and</strong> number <strong>of</strong> lumens is 30 m 2 from 620 lumens (for the 5.2 mm i.d.) or ~27 m 2<br />

from 365 lumen (8 mm i.d.).<br />

Thus far, only the MT configuration (Fig. 4.32) has found use in s<strong>MBR</strong>s. <strong>The</strong> most<br />

established <strong>of</strong> these are based on pumped, horizontally mounted crossflow modules<br />

(Fig. 4.33a), with some <strong>of</strong> the more recent plants fitted with vertically mounted

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