Article | REF: W4110 V1

Membrane filtration (RO, NF, UF) - Installation and performance

Author: Pierre AIMAR

Publication date: August 10, 2006

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1. Operating modes

1.1 Control mode

Membrane separation operations in the liquid phase, where the acting force is a pressure difference, can be carried out in two main ways:

  • by imposing a setpoint on the filtration flow ;

  • by imposing an average pressure difference across the system.

Generally speaking, controlled flow operation is considered to prevent the application of a medium set pressure, chosen for the remainder of a production cycle, at the start of the test, when the membrane is still clean and therefore of high permeability, from causing a very high flow rate and thus material accumulation and compression on the filter, leading to irreversible clogging, which conditions the plant's...

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