Organic Waste Sorting Marascala
Wasteserv Malta LTDMarascala - Malta
- System description: Organic waste sorting
- Waste processed: Organic and mixed municipal waste
- Plant capacity: 71,000 t/year
A completely automatic plant recovers from mixed municipal waste RDF, metals and organic matter to be used for the production of biogas, a valuable form of renewable chemical energy. The plant can also treat source separated organic waste. In addition to the process rejects to be disposed at a landfill, the plant automatically recovers four materials from municipal waste:
• RDF, Refuse Derived Fuel
• Biomass to be anaerobically digested
• Ferrous metals
• Non-ferrous metals.
The first treatment of mixed waste consists in the opening and emptying of the bags, which is carried out by a special machine provided with a hydraulically driven mobile floor. A whell loader loads the waste into the feeder hopper. The bag opener does not reduce the particle size of the waste excessively, because this is required for a high efficiency of the sorting operations that follow. After the sorting of the magnetic ferrous metals, a rotary drum sorts two fractions based on their particle size. The organic fraction goes to the undersized fraction, while the larger size materials are collected in the oversized fraction. A ballistic separator sorts the heavier components from the oversized fraction. These materials are disposed at a landfill after the recovery of ferrous and non-ferrous metals. To recover metals, a magnetic separator and an induction sorter are used in series. The combustibile waste is then compacted into roll-off compactors, or baled by a continuous channel automatic baler. The RDF bales are handled by a fork-lift truck. The undersized fraction from the rotary screen, after further treatment to recover ferrous and non-ferrous metals, is ready to be sent to the adjacent anaerobic digestion plant.