Rotating distributor for biological or trickling filters

The rotating distributor for biological filters DRP type has been conceived to be used both in the classic trickling filters and in the modern biological filters. It consists of a sewage inflow duct flanged to the supply piping, located in the middle of the percolation basin, having to support a rotating supply system complete of at least a couple of supply pipes radially flanged to a central manifold and stretched by means of adjustable tie rods. The sewage coming from the inflow duct radiates into the delivery pipes and comes out of them through a set of nozzles adequately sized to obtain, according to the whirlpool principle, a hydrostatic push able to put into rotation the whole distributor system. The angular velocity of the rotating distributor varies according to the resulting hydrodynamic thrust and the current friction forces; usually, it varies between 30 and 300 revolutions per hour and depends on the peripheral speed that has however to range from 0.5 to 1.0 m/s. With regard to plants without lifting system, the rotating distributor operates through a siphon. Instead, in the cases where the hydrodynamic thrust obtained by means of a lifting plant does not ensure the distributor rotation (generally regarding diameters over 35 m), the distributor is equipped with a motor (DRPM type). The standard construction is in carbon steel. On request it is possible the construction in stainless steel.