Ultrafiltration (UF) is a variety of membrane filtration in which hydrostatic pressure forces a liquid against a semi permeable membrane. Suspended solids and solutes of high molecular weight are retained, while water and low molecular weight solutes pass through the membrane.
Ultrafiltration technology produces superior quality water by removing virtually all harmful pathogens and suspended solids. Ultrafiltration membranes are designed for Cross Flow and Dead End filtration. In Cross Flow filtration a portion of the feed passes through the membrane and is called permeate. The rejected materials are flushed away in a stream called the concentrate. Cross Flow membrane filtration uses a high cross flow rate to enhance permeate passage and reduce membrane fouling.
Hollow fibre membranes also have the capability to be backwashed, where filtered water is pushed backwards through the membrane to remove accumulated solids on the membrane surface. Ultrafiltration systems provide flexibility to operate in a range of conditions that can be optimized for a specific water source to reduce operating costs.