Sludge silo

The sludge storing silo SF type is used in medium and large size treatment plants for the storage of the sludge which has been already dewatered, after thickening and treatment with belt presses or centrifuges. The silo consists of a parallelepiped shaped tank, a truncatedcone discharge hopper, a higher distribution screw, two lower extraction screws, manhole, walkways with handrail and service ladders, support legs. On request, the silo can be supplied complete with sloping screw for the loading on transport trucks. The tank is made of an adequate thick metal sheet, reinforced along the higher and lower perimeter by specific ribs, the support legs are complete with base plates and log bolts. At the inlet, the sludge has a dry concentration ranging from 18 to 30% and is distributed all along the silo length by the distributing screw which is of the type with shaft. The discharge hopper wall inclination, which concerns the whole silo length, is such as to ensure the sludge fall into the lower part of the silo, in correspondence of the two extraction screws of shaftless type. In order to ensure the required hygiene in the installation place, the silo is provided with cover. The main characteristic of this sludge silo is the rectangular base and the innovative discharge system which, unlike the cylindrical silos, avoids the creation of bridges and preferential flowing channels, even with sludge having a high percentage of dry product. On request, the silo can be provided with ultrasound level meters and/or weighing cells, in correspondence of the support legs, for the continuous measurement of the quantity of sludge in the silo. Considering its big size, the silo is pre-assembled and tested at shop and supplied in separate parts that can be easily transported and then welded or, on request, bolted at site. The standard construction is in stainless steel. On request, it is possible the use of carbon steel.