UF and NF operating logical

[wshtc]

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

 

[FiltrationEngineer]

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.

 

[brennanpe]

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.