Vibrating Membranes
Living reference work entry
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DOI: https://doi.org/10.1007/978-3-642-40872-4_594-4
Applying shear at the membrane surface is the most efficient way to control membrane fouling in a membrane filtration process (Jaffrin
2008). It is traditionally provided by coarse bubble aeration and cross-flow velocity, respectively, in dead-end and cross-flow systems. However, shear rate can also be generated by moving the membrane surfaces instead of the surrounding fluid or by moving a mass very near to the membrane surface. This type of technique is categorized as dynamic filtration systems (DFSs), also called shear-enhanced filtration. A summary of the existing DFSs is given in Table
1.
Table 1
Summary of existing DFSs (Beier 2008)
System |
Description |
Application and commercial system |
|---|---|---|
VSEP |
Membrane is oscillated at high frequency (around 60 Hz) in parallel motion relative to the flat-sheet membrane surface. The vibration energy focuses shear waves directly at the membrane surfaces repelling solids and foulant, while increasing the permeate rates. |
UF, NF, RO (Pall Corp, New Logic) |
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References
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