How many UF and NF stages/trains will you have?
If you have multiples, it is also possible to compensate for a stage/train being down by ramping the producing units to maintain a constant UF flow. Of course you will need to be a bit conservative on the UF design flux.
With this said, it is...
Your best bet is to contact one of the membrane suppliers as many of the operational issues are dependent upon the type and configuartion of the membrane.
In my opinion, the best product on the market currently is the PURON product of Koch Membrane Systems, Inc.
www.kochmembrane.com.
Regards...
If this is a pilot system I would do both. Are you planning on performing pressure and flow excursion exercises as well? What UF tube are you planning on using?
Sounds like you plan on running in a batch configuration. What is the size of the process tank and what will be the membrane...
This really dependent upon the nature of the process. What specific process (MF, UF, NF, RO) and what is it that you would lile to process (water, wastewater, milk, juice, paint, caustic, acid, etc.)? Also, how are you intending to operate (feed & bleed, single pass, dead ended, batch...
SBush is correct UF can be used dependant upon the final product desired. RO is also used for milk concentration. See the attached web page.
http://www.kochmembrane.com/mktapp_dairy.html
What's is the polymer you are using? that will tell you if HC's will effect them. While HC's may or may not contribute to degradation, free oil's will foul the membrane. This will effect productivity.