Spiral Foods

In reverse osmosis, most modules are of the hollow-fine fiber or spiral-wound design plate-and-frame and tubular modules are limited to a few appHcations in which membrane fouling is particularly severe, for example, food appHcations or processing of heavily contaminated industrial wastewater. 

In some applications of reverse osmosis and ultrafiltration spiral-wound modules in the food industry, it may be desirable to allow a small portion of the feed solution to bypass the module to prevent bacteria growing in the otherwise stagnant fluid. One way of achieve this bypass is by perforating the ATD as illustrated in Figure 3.45 [115]. 

Figure 3.45 By perforating the antitelescoping device, a small controlled bypass of fluid past the module seal is achieved to eliminate the stagnant area between the reverse osmosis module and the pressure vessel walls. This device is used in food and other sanitary applications of spiral-wound modules [115], Reprinted from Reverse Osmosis Technology, B.S. Parekh (ed.), Marcel Dekker, New York (1988), p. 359, by courtesy of Marcel Dekker, Inc.

Spiral wound Food, pharmaceutical, water Low Uses flat sheet membrane element... 

The potato is a swollen underground stem or tuber that contains a store of food for the plants. In the tuber a bud end and a stem end can be distinguished. The hollows, called eyes, are spirally arranged around the tuber surface. The tuber section is divided into the pith, parenchyma, vascular system, cortex, and periderm (Figure 2.6). 

Castro, B.N. Gerla, P.E. Hollow fiber and spiral cheese whey ultrafiltration Minimizing controlling resistances. Journal of Food Engineering 2005, 69, 495-502. 

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