Design Cycle Intervals and Membrane Integrity Testing

WAVE allows the user to set the cycle intervals for each mode in UF using the number entry boxes.

  1. Filtration Duration – span before interruptions
  2. Air scour – span between each successive incidence
  3. Acid CEB– span between each successive incidence
  4. Alkali/Oxidant CEB– span between each successive incidence
  5. CIP– span between each successive incidence

  6. Membrane integrity testing

    Figure 1: UF Cycle intervals

Note:  WAVE populates the cycle intervals by default (based on DUPONT™ Ultrafiltration – General Design Guidelines) and includes limits on the values that can be input by the user.

Membrane Integrity Testing

The integrity of membranes (made into fibers) is periodically tested in most UF systems. While the test itself involves little water (mostly compressed air), the time taken during the test would affect the timing of all the other modes in UF. For that reason it is considered in WAVE. It is possible in WAVE to specify if Membrane Integrity Testing is to be considered and if so, its duration for each train.

Note:  By default, WAVE assumes that Membrane Integrity Testing is not considered when looking at the timing of UF modes of operation.