Filtration cell and filtration device using such a cell

Filtration device comprising at least one filtration cell including:

• a vessel comprising a bottom wall and four lateral walls that extend upwards from the bottom wall and an upward opening, the four lateral walls comprising two opposite longitudinal walls and, connecting these to each other, a front-facing wall and a rear-facing wall longer than the front-facing wall,
• a filtration bed supported in the vessel and dividing the latter into an upper compartment for receiving a material to be filtered introduced through the opening and a lower compartment for receiving a filtrate,
• an outlet orifice disposed in the lower compartment for discharging the drained filtrate on the bottom wall, and
• a covering flap that projects outwards from the top of one of the said longitudinal walls
• wherein the longitudinal wall opposite to the one provided with the covering flap comprises a lower part that extends upwards vertically from the bottom wall and an upper part that extends slantingly upwards and towards the inside of the vessel from the top of the lower part, characterized in that
• wherein the front-facing wall comprises a bottom part that extends upwards vertically from the bottom wall and a top part that extends slantingly upwards and towards the inside of the vessel from the top of the bottom part;
• and in that said filtration bed comprises, with respect to said upward opening, an increased filtering surface extended on the side of the longitudinal wall opposed to the one comprising said covering flap and on the front wall, and in that said filtration bed is supported in the vessel along the four lateral walls, the filtration bed being connected to the longitudinal wall opposite to the one provided with the covering flap below the top of its lower part and to the front wall below the top of its bottom part.