Surface water decantation plant has hydraulic distributor with deflector and adjustable partition forming inlet slit extending across tank width

摘要

The decantation plant has an intake for effluent water leading to a feed chamber (2) with a pit (21) at the bottom to collect heavy materials and sludge, a tank (3) with a counter-current decanting structure (7) enabling rising water to overflow into a chamber (4) with an outlet siphon. The plat incorporates a hydraulic distributor with an inlet (8) in the tank (3), equipped with a lower deflector (9) adjacent to the top of a sludge retaining partition (36), and an adjustable partition (10) at the top that forms an inlet slit extending across the whole width of the tank below the decanting structure to direct the effluent above the sludge storage zone (35) and distribute them evenly over the length of the structure. The decanting structure consists of a series of inclined parallel vanes creating a passage for the rising water in counter-current to the deposition of suspended materials.