Ultrasound of 20 kHz was used to extract phenolics from artichoke waste (bracts).

Total phenols and chlorogenic acid were concentrated by nanofiltration.

Permeate fluxes and fouling were influenced by alcoholic content of extract.

Hermia's models and surface analyses identified the membrane more susceptible to fouling.

Membrane selection was done in terms of flux, fouling behavior and phenols retention.