A feed solution or suspension is pumped under pressure over a membrane (cross-flow-filtration, TFF). This membrane is selectively retaining the desired components. This starts with the most open membrane which retains microparticles (microfiltration) followed by ultrafiltration (retaining macromolecules) and nanofiltration (retaining smaller molecules down to some 100 Dalton) and ends with reverse osmosis retaining most components other than the solvent (water or organic solvents). The product can be the permeate or retentate. Possible operations are concentration and diafiltration. Membrane processes often offer the more efficient process alternative for separations: combined cleaning, desalting and concentration of suspensions or solutions, desalination or solvent recovery.
Whether reverse osmosis, nanofiltration, ultrafiltration or microfiltration - we have learned from over 300 applications in 20 years. Ranging from feasibility studies to membrane screening (finding the best membrane for an applcation), process optimization and piloting as well as process simulation and scale-up. We have a wide choice of membranes and modules from different suppliers in stock. We are testing continuously new membranes and new applications. This base of membranes and know-how ensures that we quickly find the right membrane for your separation problem. And we know how to run the process. A side effect is that we use and improve the laboratory and pilot membrane test units we are selling.