212
edits
Difference between revisions of "Membrane filtration"
Jump to navigation
Jump to search
→Cross-flow filtration: changed drag to entrained
(→Dead-end filtration: small error) |
(→Cross-flow filtration: changed drag to entrained) |
||
| Line 27: | Line 27: | ||
==== Cross-flow filtration ==== | ==== Cross-flow filtration ==== | ||
In cross-flow filtration (CFF), the feed flows parallel to the membrane surface. The tangential flow allows | In cross-flow filtration (CFF), the feed flows parallel to the membrane surface. The tangential flow allows the accumulated rejected solutes on the surface of the membrane to be entrained, limiting the thickness of the cake layer and helping to maintain the permeate flow. CFF is widely used for concentration, purification or fractionation of target compounds from liquid streams. | ||
The membrane module is also a key parameter in the performance of a membrane separation process. The modules are designed with the objective of increasing turbulence on the surface of the membrane to reduce the mass transfer resistance and the concentration effects. The most used modules are plate and frame, spiral, tubular and hollow fibres. | The membrane module is also a key parameter in the performance of a membrane separation process. The modules are designed with the objective of increasing turbulence on the surface of the membrane to reduce the mass transfer resistance and the concentration effects. The most used modules are plate and frame, spiral, tubular and hollow fibres. | ||