The most efficient sludge-dehydration techniques that can be used for the dehydration of waste generated during water treatment. Low energy consumption, noise free, high efficiency. It is mainly used in municipal sewage, petroleum refining, brewing leather, printing and dyeing and papermaking, coal beneficiaries, biopharmaceuticals, steel pickling, food processing and other industries
The Sludge Screw Dehydrator is capable of draining, thickening and dehydrating flocculated sludge.
Below are the main advantages of the machine:
• Drum with fixed wedge-wire (no moving rings) for greater resistance and durability.
• Spray nozzles fixed on mobile ring. The washing cycle starts only when necessary in order to reduce washing water consumption.
• Machine controlled by PLC to guarantee total automation and constant performance.
• Completely enclosed machine to ensure clean spaces and odor control. Concrete filtrate collector tank not required.
• Machine supplied fully assembled and tested to ensure quick and easy installation.
• Completely made of AISI 304L.
• Machine complete with:
• Bearing structure made of AISI 304L, complete with inspection doors, designed to contain and discharge the liquid fraction deriving from the process via a flanged connection
The Screw Dehydrator for sludge is a conical screw press and cylindrical screen (drum) made up of three treatment areas:
1) Entrance and drive area,
2) Zone of thickening and dehydration, consisting in turn of three zones with differentiated spacing,
3) Pressing area with counter-pressure cone.
In the inlet area the machine receives the flocculated sludge of sufficient stability coming from a mixer, then entering, by gravity, the thickening and dehydration area. The latter is made up of 3 fixed grilling cylinders, with 3 different spacings: 0.5 mm, 0.4 mm and 0.15 mm.
As the sludge advances, the available volume is gradually reduced thanks to the rotating conical screw (with increasing diameter) and the reduction in the pitch of the spirals. The sludge is therefore mechanically compressed and dehydrated by passing the supernatant through the increasingly smaller cracks. In the final part of the screen, the residual water is expelled from the sludge by pressing the pneumatic counter-pressure cone at the press outlet.
Depending on the type of consistency of the mud flakes, the pressure applied to the mud can be varied as needed. The sludge is finally pushed beyond the cone by the transport screw into the discharge chamber
The sludge to be treated coming from the mixer is introduced into the lower part of the machine (sludge inlet flange), the presence of the sludge is immediately detected by the “sludge presence” sensor. As the sludge level increases, it enters the drum and undergoes an initial screening (0.5 mm spacing). Following detection of the presence of sludge, the conveyor screw is activated which pushes the sludge upwards, during movement the sludge is compressed and drained (0.4 mm spacing). The filtered part is collected in the collection tank that encloses the cylinder, and is sent downstream of the machine through the filtered outlet flange. When the sludge reaches the end area of the drum, it is pressed between the spirals of the conical screw and the counter-pressure cone, the spacing of the drum is 0.15 mm. Compaction depends on the pressure in the cone push cylinders. When the thrust in the sludge exceeds that of the cone, the latter moves away allowing the dehydrated sludge to escape from the drum and fall into the discharge hopper.
