Ultra filtration or UF is a pressure driven membrane separation process that separates particulate matter from soluble components in the carrier fluid (such as water). Ultra filtration has larger pores than nano filtration and reverse osmosis. Ultra filtration is a low pressure membrane process used to separate high molecular weight compounds from a feed stream.
Typically, ultra filtration will remove high molecular-weight substances, colloidal materials, organic and inorganic polymeric molecules Low molecular-weight organics and ions such as sodium, calcium, magnesium chloride, and sulfate are not removed. Because only high-molecular weight species are removed, the osmotic pressure differential across the membrane surface is negligible.
Ultra filtration (UF) is a pressure-driven barrier to suspended solids, bacteria, viruses, end toxins and other pathogens to produce water with very high purity and low silt density. It serves as a pretreatment for surface water, seawater, and biologically treated municipal effluent before reverse osmosis and other membrane system
Ultra filtration, like reverse osmosis, is a cross-flow separation process. Here liquid stream to be treated (feed) flows tangentially along the membrane surface, thereby producing two streams. The stream of liquid that comes through the membrane is called permeate. The type and amount of species left in the permeate will depend on the characteristics of the membrane, the operating conditions, and the quality of feed. The other liquid stream is called concentrate and gets progressively concentrated in those species removed by the membrane. In cross-flow separation, therefore, the membrane itself does not act as a collector of ions, molecules, or colloids but merely as a barrier to these species.
Advantages:
• Low fouling membrane modules
• Excellent filtration performance
• High chemical resistance and temperature
• Tolerance for effective membrane cleaning
• High removal efficiency of bacteria and viruses
• Can be periodically back washed to improve
• Performance and extend operating life by removing the fouling layer
Credit to: chemtronicsindia.com
No comments:
Post a Comment