MMW Sorting Campi Salentini
SUDGAS SrlCampi Salentina | Lecce - Italy
- System description: Shredding, sorting and baling
- Waste processed: Mixed municipal solid waste
- Plant capacity: 30 t/hour
The plant treats mixed municipal waste, which is sorted to obtain the three following fractions:
• Small size material;
• Large size material;
• Ferrous metals.
The small size material is suitable to go through a biological stabilization process, i.e. composting. In fact this fraction of municipal waste contains organic components that may be composted. Furthermore, after treatment in the sorting plant, it is more homogeneous and uniform in size.
The production of compost is a technology that may significantly reduce the environmental impact of organic waste disposal in a sanitary landfill. The larger-size fraction contains combustible materials, such as paper, plastics and wood. It is thus suitable for the production of RDF (refuse derived fuel) to be used for generating heat or electricity. In any case, this material can be disposed of in a landfill with a lower environmental impact, if compared to the disposal of untreated municipal waste. In fact this material contains less organic matter and therefore it generates less biogas and leachate. Besides, shredding the bulky components and compacting material in bales occupies less landfill space. Ferrous metals recovered at the plant can be recycled for the production of steel by electric arc furnace, after refining if this is required by the steel scrap specifications. A slow speed shredder opens the bags containing waste and reduces the size of the bulkiest components.
Both this shredder and the baler were supplied by third parties, while their installation in the plant was coordinated by Ecomaster. A conveyor belt lifts the shredded material up to the inlet chute of a rotary screen. This conveyor has a magnet to separate magnetic metals. Small-size materials go through the screen and form the undersize fraction, which is collected by a conveyor set up under the screen. This fraction is then unloaded into roll-off containers by means of a swiveling conveyor equipped with ultrasound level meters. A second magnet is set up before the station of the roll-off containers and separates further metals from the undersize fraction. The material that did not go through the screen is collected at the outlet of the screen drum and sent to the baler by two conveyors.