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Membrane and Desalination Technologies - TCE Moodle Website

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Treatment of Food Industry Foods <strong>and</strong> Wastes by <strong>Membrane</strong> Filtration 261<br />

Fig. 6.20. Cross-flow pervaporation system for VOC separation.<br />

Waste Solution<br />

Waste Acids<br />

Metallic<br />

Salts<br />

A A A<br />

Acids Acids<br />

Metallic<br />

Salts<br />

CMR proved to be a feasible process for the treatment of liquefied starch (Table 6.5 <strong>and</strong><br />

Fig. 6.18). Cyclodextrin (CD) can be produced from starch in the presence of CD-forming<br />

enzyme in a fermentation reactor (Fig. 6.18). To enhance the CD productivity, UF membrane<br />

is used in conjunction with the fermentation reactor forming a CMR in which an enzyme is<br />

continuously separated by UF <strong>and</strong> recycled to the fermentation reactor for CD production.<br />

The fermentation reactor is usually a stirred-tank. The UF membrane separates CD <strong>and</strong><br />

recycles the enzyme. The functions of the NF membrane shown in Fig. 6.18 are twofold:<br />

Water<br />

Recovered Acids<br />

Fig. 6.21. Diffusion dialysis system using anion-exchange membrane. A: Anion Exchange <strong>Membrane</strong>.

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