MMW Mechanical Treatment Cavallino
Ambiente & Sviluppo ScrlCavallino | Lecce - Italy
- System description: Shredding, sorting and baling
- Waste processed: Mixed municipal solid waste
- Plant capacity: 60 t/hour
The facility treats mixed municipal waste that is sorted into two fractions: small size material, suitable to go through a composting process, and large size material containing combustible components.
This sorting facility treats mixed municipal solid waste to produce the three following fractions:
• Small size material;
• Large size material;
• Ferrous materials.
Small-size material can go through the biological stabilization process, i.e. composting. On the same site Ecomaster built the first unit of a composting plant using biotunnels. The large-size material contains combustible materials, such as paper, plastics and wood. Therefore, it is 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 compared to that of untreated municipal waste. In fact, it generates less biogas and leachate. Besides, the shredding of bulky components and compacting into 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 large-size material that did not go through the screen is collected at the outlet of the screen drum, processed by a third magnet and sent to the baler by means of a conveyor belt.