• This alternative fuels installation is designed for the production of PEF (Processed Engineered Fuel). PEF is a fuel with uniform, constant quality made from various non-recyclable waste materials with variable quality. Its main raw waste material is the Municipal Solid Waste (MSW) of Sofia, while the PEF is enhanced by the use of other carefully selected high heat value (HHV) industrial, commercial or biomass waste.

  • The delivered waste materials are deposited inside the building and fed by clamshell loader into the primary shredder, manufactured by “M&J”, which shreds them at 10 tons per hour with an output size ranging between 100-300 mm. The shredded materials are then transported by belt conveyor to the second stage for further treatment.Separation of the useful light fraction from inert materials is achieved though the vibrating screen “Spaleck”, with screen sieve openings of 30 mm. The purpose of this vibrating screen is to remove inert material (small rocks, glasses, metals, dirt, and sand), which are then transported out of the building and deposited in a reject container.

  • After the vibrating screen the materials enter in the “Westeria” Wind Sifter, that furthers separate the light fraction (drier and two dimensional particles) from the heavy fraction (wet, heavier and three dimensional particles). The heavy fraction is again transported outside of the building into the reject container.The separated light fraction is then transported by conveyor belt into the secondary shredder, manufactured by “Weima” Fine Cut with a productivity of 10 tons per hour and output particle size of 20-25 mm.

  • Three metal separators are placed a along the PEF production line, to remove unwanted metal particles from the system. All the separated metals are then transported out of the building as rejects.An additional dosing and feeding belt is installed between the Wind Sifter and the secondary shredder. Its purpose is for other homogenous material (i.e. HHV waste and/or materials) to be fed into the production line in order to enhance the final quality of the main stream of materials.
  • A “Schenck” feeding system is used to transport the produced PEF from the processing building to a purpose build silo by pneumatic pipe line. In the silo additional homogenization is performed. The PEF is finally extracted through a dosing system and pneumatically fed to the main burner of the kiln.