Stainless Steel Ultrafiltration Systems Water Treatment

Pure Water Making Machine Stainless Steel Ultrafiltration / Nano filtration System

Introduction of Ultrafiltration / Nano filtration System

Nanofiltration (NF) is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose of softening (polyvalent cation removal) and removal of disinfection by-product precursors such as natural organic matter and synthetic organic matter.

Nanofiltration is also becoming more widely used in food processing applications such as dairy, for simultaneous concentration and partial (monovalent ion) demineralisation.

The key of the nanofiltration process is the nanofiltration membrane.
Requirements of membrane materials is: has good film-forming property, thermal stability, chemical stability, high mechanical strength, acid and alkali, and microbial corrosion, resistance to chlorine and other oxidizing substances, have high water flux and high entrapment rate, colloid and suspended solids pollution resistance, salt and using nanofiltration membrane is much cheaper for aromatic and poly acid hydrogen composite nanofiltration membrane.

Historically, nanofiltration and other membrane technology used for molecular separation was applied entirely on aqueous systems. The original uses for nanofiltration were water treatment and in particular water softening. Nanofilters can "soften" water by retaining scale-forming, hydrated divalent ions (e.g. Ca2+, Mg2+) while passing smaller hydrated monovalent ions.

In recent years, the use of nanofiltration has been extended into other industries such as milk and juice production. Research and development in solvent-stable membranes has allowed the application for nanofiltration membranes to extend into new areas such as pharmaceuticals, fine chemicals, and flavour and fragrance industries.