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Filtration

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Complete Filtration Resources Inc. offers four different types of filtration processes, which are listed below:

What is Crossflow Filtration? Crossflow filtration is a procedure whereby liquid is filtered through a porous membrane while the feed solution flows rapidly across the surface of the membrane.

Rapid crossflow causes turbulence at the surface of the membrane, which serves to keep the membrane from becoming plugged. As a result, a large volume of solution can be filtered in a short period of time.

Crossflow filtration is performed using all types of membranes. RO membranes have the smallest pores and ideally permit only water to pass through. NF membranes are slightly more open than RO membranes and permit small molecules of less than 250-500 Da to pass through the membrane. UF membranes have very small pores, ranging in size from 1,000 Da to 1,000,000 Da molecular weight cutoff (MWCO). MF membranes have pores ranging in size from 0.01 µm to 8.0 µm.

Crossflow filtration is often referred to as tangential flow filtration because the feed solution flow is tangential to the surface of the membrane. The clarified solution is termed the filtrate or permeate. The concentrated solution that exits the membrane device is termed the concentrate.

  • Reverse Osmosis - This process uses a membrane which permits only water to pass through. Some small molecules with water like properties (such as ethyl alcohol) may also pass read more...
  • Ultrafiltration - This process uses a membrane with a Molecular Weight Cutoff range between 1000 and 1,000,000 Daltons. It is used primarily to concentrate read more...
  • Microfiltration - This process uses a membrane with a pore size in the range between 0.1 and 5 microns. It is used primarily for solution clarification, bacteria removal read more...
  • Nanofiltration - This process uses a membrane with a Molecular Weight Cutoff range between 150 and 1000 Daltons. It functions as a loose or leaky RO membrane read more...