Technology Sheet Ultrafiltration Membranes
Cross-flow ultrafiltration has been accomplished using either hollow fibers, porous tubes or porous monoliths. Porous monoliths incorporate multi-channel designs which can accomplish high surface areas in compact designs, with minimal seals. Specific fields of application for porous monolith membranes are:
• Caustic recovery
• Solvent recovery
• Water and effluent treatment
• Surface water treatment and
• Oil/Water separation
Cross-flow ultrafiltration is a continuous flow process in which the feed stream flows inside the multiple channels and purified effluent flows through the porous structure of the membrane. The separation is driven by the pressure difference from one side to the other, known as the trans-membrane pressure. By operating the channels at high flow rates, the liquid turbulence minimizes the fouling effects of the filtration layer on the channel surface. The retentate or reject exiting the channels has a higher concentration of large molecules and/or particles, which are unable to transport across the filtration layer of each channel.