×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

UF and NF operating logical

UF and NF operating logical

UF and NF operating logical

(OP)
I am design a WTP to use UF as the pre-treatment of NF
Both of them design at 26L/s of influent flow rate.

The permeate of UF will feed to a Transfer tank and the to the NF system.

Now my question is because The feed rate to the NF is constant rate which is 26L/s as the backpulse and MIT of UF happen, there will be no flow into the trasnfer tank. Then the water level in the tank will drop. At some time, the NF have to stop as the water level in the transfer tank is too low. It will start again when the water level back to the set point.
Are there any way to aviod and NF can continue running without shut down. AS everything the NF stops, it requires the permeate flush from the CIP tank. We don't want to do that  

RE: UF and NF operating logical

Just think about Net flow vs. gross instantaneous flow.  The UF system should provide an average (net) flow, so as long as your transfer tank is large enough to handle the rise in level during filtration period and fall in level during backwash, you should be fine.

RE: UF and NF operating logical

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 much more simplier and direct to size the intermediate tank large enough to compensate or provide buffer storage as FiltrationEngineer states above.

 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources