Produce very high purity water or pretreat process water.
Ultrafiltration is a membrane filtration process that is removes suspended solids, bacteria, viruses, endotoxins and more to produce high purity water with low silt density. Ultrafiltration membranes are tighter than microfiltration but looser than nanofilters and reverse osmosis. Lower pressure is used to force fluid through the membrane which results in lower operating costs. Also, it is very effective at removing tiny particles which can quickly foul reverse osmosis membranes and therefore used as pretreatment upstream of RO.
How ultrafiltration systems work.
Ultrafiltration uses hydrostatic pressure to force water through a semi-permeable membrane. The pore size is usually 103-106 Daltons. Ultrafiltration may use spiral wound membranes that utilize cross-flow separation, hollow fiber membranes, or from the outside-in using a vacuum to purify water. The membranes remove very small particles such as chlorine-resistant organisms, bacteria, organics, sediment, high molecular weight solutes and other suspended solids.