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Membrane and Desalination Technologies - TCE Moodle Website

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Gas-Sparged Ultrafiltration: Recent Trends, Applications <strong>and</strong> Future Challenges 677<br />

Table 16.1<br />

Comparison of flux enhancement by using different membrane modules, operating<br />

conditions <strong>and</strong> test media<br />

Test media <strong>Membrane</strong> module & operating<br />

conditions<br />

Coloured dextran<br />

MW: 87 kDa<br />

Dextran<br />

MW: 260 kDa<br />

Dextran<br />

Blue dextran<br />

BSA<br />

Dextran<br />

MW: 83 kDa<br />

HSA<br />

MW: 66 kDa<br />

Clay suspensions<br />

dp: 1mm<br />

Clay suspensions<br />

dp:1mm Vertical tubular module<br />

di: 12.7 mm<br />

V g/V l: 0.7<br />

Vertical tubular module<br />

Vg: 0–0.35 m/s<br />

Vl: 0.14–0.78 m/s<br />

Vertical tubular module<br />

Vg: 0–0.13 m/s Vl: 0.13–0.39 m/s<br />

Hollow fibre modules<br />

V g: 0.006–0.014 m/s<br />

V l: 0.097–0.18 m/s<br />

di: 0.2mm<br />

Vg: 0.007–0.017 m/s<br />

Vl: 0.12; 0.21 m/s<br />

di: 0.5 mm<br />

Hollow fibre module<br />

Vg: 0–0.6 m/s<br />

Hollow fibre module<br />

V g: 0–1 m/s<br />

di: 0.93 mm<br />

Bentonite suspensions Tubular module<br />

Vg: 0–2.5 m/s<br />

Vl: 0.31–1.57 m/s<br />

di: 15mm<br />

HSA & IgG mixture Tubular module<br />

V g: 30–150 mL/min<br />

BSA, Lysozyme, HSA,<br />

IgG<br />

V l: 0.25–1 L/min<br />

Rectangular flat-sheet tangential flow<br />

module<br />

Vg: 0–200 mL/min<br />

Yeast suspension Flat-sheet ceramic module<br />

Vg: 0–10 L/min<br />

Vl: 3–16.66 L/min<br />

Flux enhancement<br />

(%)<br />

70–250 (12)<br />

320 (37)<br />

60<br />

(13)<br />

113<br />

91<br />

20–50 (27)<br />

10–60<br />

155 (45)<br />

110 (43)<br />

200 (33)<br />

70 (34)<br />

50 (51)<br />

100 (53)<br />

References<br />

being used for bioseparation. The first reported use of gas sparging to enhance flux in a hollow<br />

fibre membrane module was by Lee at al. (42). In their study of E. coli suspension ultrafiltration<br />

using 1 mm inner-diameter PS hollow fibres, 65% increase in permeate flux under the<br />

stabilized operating conditions was observed.

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