Microfiltration cassettes

Other The cassette (Fig. 22-54), a modification of a plate-and-frarne device that is favored because of the ease of scale-iip from lab-oratoiw to small plants is widely i ised in pharrnace i itical microfiltration and iiltrafiltration. An entirely different module also called a ca.s.sette is used in the IVIF of vv ater. There are a host of other clever module designs in use, and new ones appear frequently. 

Cross-flow is the usual case where cake compressibility is a problem. Cross-flow microfiltration is much the same as cross-flow ultrafiltration in principle. In practice, the devices are often different. As with UF, spiral-wound membranes provide the most economical configuration for many large-scale installations. However, capillary devices and cassettes are widely employed, especially at smaller scale. A detailed description of cross-flow microfiltration had been given by Murkes and Carlsson [Crossflow Filtration, Wiley, New York (1988)]. 

Figure 3 Membrane modules for microfiltration and ultrafiltration, (a) Tubular membrane module. (From Zeman and Zydney, 1996.) (b) Cassette membrane assembly. (From Perry et al., 1997.) (c) Spiral wound membrane module. (From Purchase, 1996.) (d) Hollow fiber membrane module. (From Zeman and Zydney, 1996.)...

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