Ultrafiltration Systems

Ultrafiltration is a technique for separating dissolved molecules in solution on the basis of size which means that molecules larger than the membrane pore size rating will be retained at the surface of the membrane. The accumulation of retained molecules may form a concentrated gel layer. The impact of gel-layer formation is that it can significantly alter the performance characteristics of the membrane. This is commonly called concentration polarization. Fundamentally, the gel layer will limit filtrate flow rate and any increase in pressure will have no beneficial effect. Controlling and reducing the impact of gel-layer formation has been achieved with two Pall Ultrafiltration product lines: Pall Filtron Cassette Systems and Microza Hollow Fiber Systems.