The field applied of ultrafiltration film is food, beverages, biology and medicine, industry of fine chemicals and treatment and reclaims to use of waste water. Ultrafiltration film is a film filtering between micro-filtering and nanometer-filter, which is applied to separation, concentration, and purification of substance. Its token is that withhold amount of molecule while it used. It is mainly used to separate macro molecule, colloid and micro molecule substance such as mote solvent in liquor, which make macro molecule, colloid and mote etc. withhold on the film surface : than substance cycle to flow, to form concentration liquid and reach the aim of separation, concentration and purification of substance.
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 fiber 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. Ultrafiltrafion systems provide flexibilily to operate in a range of conditions that can optimized for a specific water source to operating costs. Typical operating pressures for these systems are in the range of 0-20 pounds per sq. inch.
