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TECNOLOGY AND APPLICATIONS OF SPIRAL WOUND MEMBRANES
 
Cross flow polimeric membranes are available with different porosities (reverse osmosis, nanofiltration, ultrafiltration, microfiltration) and with different configurations (tubular, hollow fiber, flat sheet and spiral wound).
Each configuration offer advantages and disadvantages.

 
Spiral wound configuration is normally selected for its efficiency and low cost.
 
Elements are manufatured with two sheets of membrane rolled on a central permeate tube and separated by a concentrate spacer that create channels for feed flow.
 
Membrane elements are reinforced with an external fiberglass cage or with a polypropylene cage. On both ends there are supports (ATD) that avoid mechanical deformation of the membrane (telescoping).
 
A correct choice of construction material and manufacaturing process allows to work on low to medium load fluids, at high/low pH and at high temperature, up to 90° C.
 
Feed solution is pressurized on one side of the element and part of the solution (permeate) can pass through the membrane and is collected in the permeate tube. The other part of the solution flows in concentrate channels and is collected on the other side of the element with all components that cannot go through the membrane.
 
Spiral wound membranes are finally very tight filters that operate with the following advantages:
 
 
 
 

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