Ultrafiltration (UF)

Ultrafiltration (UF) is a common pretreatment process used to clean the feed water for reverse osmosis systems. These systems are capable of removing colloidal particles, viruses, bacteria, and suspended solids and turbidity removal. With UF filtrate SDI levels often reaching less than 1.0. UF membranes block suspended particulates and solids that are large while water and solutes with a lower molecular weight are allowed to flow through the membrane. Ultrafiltration (UF) membranes systems are more reliable than a conventional multi-media filter, which removed approximately 10 micron or larger of matter, where an ultrafiltration membrane pore size ranges from 0.01 to 0.10 micron. The water filtration efficiency achieved by UF systems are around 250 times greater than conventional media filtration systems.

The advantages of UF:
• Superior filtration performance with high flux
• Very small nominal pore diameter (0.03 µm)
• Efficiently removes bacteria and viruses
• Low fouling membrane modules
• Basic, vertical, modular design permits low cost, compact systems
• Membranes have a high chemical resistance and temperature tolerance
• Low cost, easy to operate, carry no contaminate residue, and high recovery ratio
• Compact plant size
• Constant product quality regardless of feed quality
• No chemicals required (aside from cleaning)

The applications of UF:
UF is extremely suitable as pre-treatment in the preparation of drinking water or process water. It has excellent properties for removing suspended matter and bacteria and turbidity. UF is implemented:
• As pre-treatment for reverse osmosis;
• Re-use of wastewater flows.
• A membrane bioreactor combines biological purification with ultra-filtration
Also it used in:
• Dairy industries;
• Food industries;
• Metal industries (oil/water emulsion separation);
• Textile industries;
• Pharmaceutical industry;
• Chemicals and petrochemical industries;
• Disinfection