Spiral Wound Membrane Module
A number of membrane module designs are possible, and all are based on two types of membrane geometry: (i) flat sheet membranes and (ii) capillary fibers. Plate-and-frame as well as spiral wound modules house flat membranes (Mulder 1997).
The spiral wound module is an important module type for membrane applications. Initially it was developed for reverse osmosis applications and is nowadays also used in ultrafiltration and gas permeation applications (Blackmer and Hedman 1979).
Spiral wound modules are used where pressure drop has to be considered and when counter current flow is not needed to maximize separation efficiency. Higher pressure applications involving costly pressure vessels and piping make the hollow fiber modules more favorable because this reduces the component costs of the system by as much as a factor of ten in some cases (Koros and Fleming 1993).
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