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Rules of thumb on UF systems

Q: My process uses ultra filtration. There are many variables to watch on the system such as feed pressure, membrane pressure, recycle pressure, permeate flow rate and concentrate (reject) rate. What parameters are most important to watch? Is there a good resource for general rules of thumb on UF systems?

A: The most important variable is permeate flux at fixed trans-membrane pressure. The permeate flux will decrease as the UF membranes foul and indicate when cleaning needs to be done.