How the experimental knowledge of the irreversible fouling distribution can contribute to understand the fluid circulation in a spiral ultrafiltration membrane.
Résumé
It is commonly thought that in a spiral membrane the fouling is high at the module inlet and progressively decreases toward the outlet. Thanks to an exptl. mapping of the irreversible fouling existing in a spiral membrane of 6.5 m2 area, this paper shows that it is not systematically true and that the fouling distribution can be much more complex. This paper shows also in what extent the mapping of the irreversible fouling existing in a spiral membrane is a powerful approach to deal with the role of the velocity/turbulences gradient that can be exptl. studied independently of the transmembrane pressure gradient in appropriate filtering conditions. The fouling distribution suggests that the velocity/turbulences are roughly const. on 50% of the membrane area located in its center when dealing with a radial dimension, whereas part of this mean position, velocity/turbulences can increase or decrease. [on SciFinder(R)]
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