For some of my ultrafiltration membrane it takes more than 3 hours to get steady state flux but for some others even after 30 min pure water flux achieves a steady state.
Hi Tania, Thank you for your answer. You are right, they do not behave the same way, but they should in some point get steady state in a acceptable reproducible range. If we want to report the data, we should get acceptable standard deviation. So, How do you collect the data with your membrane and report them?
Hi. Thank you for introducing your paper to me. How long did it take for your membranes to reach steady state flux?
Would you please send full text paper to me? I am sure I can get helpful information from it. For sure in case of getting intellectual help from it, I will cite it on my paper. Thank you again.
Hi Tania. Thank you so much. This is my email address: [email protected]
Thank you
There are some method for determination of pure water flux...
in general for ultrafiltration membrane 100-200 Psi transmembrane pressure has been applied. Also, one should apply little higher pressure prior to measure PWP (this phenomenon called as membrane compaction...after this process we can have constant and reproducible fulx for same membrane..)
Generally, compaction took 30-60 min...if you are doing your experiment with batch type cell than you can use pressure about 20 psi higher for membrane compaction..and then you can measure PWP at specific Transmembrane pressure...
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