Lamella and lamellar module for clarifier

A lamella for a clarifier comprising a rectangular or square plate, made of a single piece, wherein the plate is provided with:

• a plurality of longitudinal straight ribs running from the top part of the plate to the bottom edge thereof,
• a plurality of longitudinal straight folds, each of the folds extending from the top part of the plate to the bottom edge thereof and each of the folds being interposed between a pair of longitudinal ribs, so that the space comprised between the pair of longitudinal ribs defines a projection with V-shaped walls that projects forward in the sagittal direction and on which corner the longitudinal straight fold is located;
• a plurality of wings, one of said plurality of wings being arranged on the front part, in the sagittal direction, of each longitudinal straight fold and another of said plurality of wings further being arranged on the rear part, in the sagittal direction, of each longitudinal straight fold;
• four end wings;
• one end wing being arranged on the front part, in the sagittal direction, of each of the longitudinal edges of the plate and one end wing further being arranged on the rear part, in the sagittal direction, of each of the longitudinal edges of the plate;
• a top transverse fold provided in the top part of the plate and defining a flat portion extending backwards in the sagittal direction a constant distance from the fold point to the top edge of the plate;
• and
• a bottom transverse fold provided in the bottom part of the plate, such that the bottom part curves backwards in the sagittal direction.