grille à nettoyage manuel

CONT: Le dégrillage est assuré, soit par une grille à nettoyage manuel, soit (obligatoirement à partir d'une certaine importance de la station) par une grille à nettoyage automatique, dite grille mécanique.

CONT: Mechanically cleaned screens have clear bar openings of approximately 1 in. ... collected solids are removed from the bars by a traveling rake that lifts them to the top of the unit. ... Mechanically cleaned screens are preceded by hand-cleaned bar racks for protection in large combined sewer systems.
OBS: for ""hand-raked screen"": to hand rake (a screen): Bar screens or bar racks are used in small or large plants to collect the larger floating material. ... As the sewage flows through the screen, the coarser materials are caught on the upstream face and are either hand or mechanically raked ... to a platform at the upper end of the screen.