Clariflocculator with turbine central drive type

The clariflocculator with turbine and central drive type PRCCC1 consists of a rotation unit with central drive including a gear motor and slewing ring, a high efficiency turbine, a bottom scraper system having two blade holder arms, a central deflector cylinder which defines the mixing and flocculation compartment and a peripheral weir. The control and drive unit is located in the middle. It comprises an electric motor, a multistage reduction unit of coaxial and/or planetary type and a slewing ring with hardened and tempered teeth of adequate size. The protection against overloads is carried out by an electronic torque limit switch for diameters up to 20 meters while as regards the diameter equal to or greater than 20 meter, an adjustable dynamometric torque limit switch complete with alarm signaling device is required. The gear motor to drive the turbine is located in the middle of the slewing ring and since it has a variable speed, the coagulants mixture is optimized and the flock precipitation made easier. The sludge scraper blades remove the sludge precipitated to the sloping bottom of the tank and gathers it in a central ditch wherefrom it is then sucked. The clarified water is removed by means of the weir. The scraper and any moving parts of the bridge are supported and moved only through the central slewing ring bearing. This way, the sedimentation tank volume, free from any parts in motion allows, for example, the installation of lamellar packs in its inside and it avoids the maintenance on the clarifier edge required if the bridges is peripheral driven type, in correspondence of the traction trolleys. On request it is possible to have the floating materials recovery and elimination system consisting of surface scrapers, periphery deflector and scum box. It is also possible to request a walkway for the inspection on the central unit, the standard type of execution is diametral as for diameters up to 20 meters and radial as for diameters equal to or greater than 20 meters. The standard construction is in carbon steel. On request, the construction in stainless steel or aluminium is possible.