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Membrane and Desalination Technologies - TCE Moodle Website

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<strong>Membrane</strong> Separation: Basics <strong>and</strong> Applications 299<br />

Table 7.4<br />

Typical characteristics of membrane modules<br />

Feed<br />

Permeate<br />

Permeate<br />

l A compact structure<br />

l High-pressure durability<br />

l Less contamination<br />

l Less pressure drop at the permeate channel<br />

l Minimum concentration polarization<br />

Plate <strong>and</strong> frame Spiral wound Tubular Hollow fibre<br />

Packing density (m 2 /m 3 ) 30–500 200–800 30–200 500–9,000<br />

Resistance to fouling Good Moderate Very good Poor<br />

Ease of cleaning Good Fair Excellent Poor<br />

<strong>Membrane</strong> material choices Many Many Few Few<br />

Relative cost High Low High Low<br />

Applications D, RO, PV, UF, MF D, RO, GP, UF, MF RO, UF D, RO, GP, UF<br />

MF microfiltration, UF ultrafiltration, D dialysis, PV pervaporation, RO reverse osmosis.<br />

<strong>Membrane</strong>s Spacer<br />

Retentate<br />

Permeate<br />

Usually, a number of spiral-wound modules are assembled in one pressure vessel <strong>and</strong> are<br />

connected in series via the central permeate tubes. Some industrial-scale spiral-wound<br />

modules are shown in Fig. 7.11.<br />

Feed<br />

Fig. 7.9. A plate-<strong>and</strong>-frame module.<br />

Retentate

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