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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 241<br />

microfiltration<br />

ultrafiltration<br />

nanofiltration<br />

reverse osmosis<br />

MEMBRANE SEPARATIONS<br />

suspensions<br />

particulates<br />

macromolecules<br />

The latter four module designs use flat sheets of membrane in various configurations.<br />

In selecting a particular membrane module <strong>and</strong> a particular membrane process, the major<br />

criteria are:<br />

1. Feed stream characteristics, which affect the biocompatibility of the membranes.<br />

2. Flux requirements, which are controlled by the volumetric rate of a feed stream.<br />

3. Rejection requirements, which decide the process objectives <strong>and</strong> treatment efficiencies.<br />

4. Cost requirements, which are affected by the energy consumption, membrane replacement cost<br />

<strong>and</strong> operating <strong>and</strong> cleaning costs.<br />

Biocompatibility of the membranes relates to the interaction between the membrane<br />

module <strong>and</strong> the feed stream. Major biocompatibility factors include: (a) stability to extremes<br />

water<br />

sugars<br />

salts<br />

Fig. 6.2. Separation capabilities of MF, UF, NF, <strong>and</strong> RO.

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