• The oversize compost material is fed in to a Doppstadt SM518F trommel with integral hopper feeder at a rate in the region of 20 tonnes per hour. The trommel removes the <10mm fines.
• The >10mm material moves into a Westeria Windsifter, here all light materials such as plastic film, foils and any super-light organic materials are blown-out of the material stream. These light materials are a suitable refuse derived fuel (RDF)
• The remaining heavy fraction from the windsifter is conveyed into the feed zone of the Doppstadt HDS-M Washing System. Fast jets of water push materials down into the water separation tank, where the stone, metal and any other heavy materials move out the bottom via screw conveyor. The resulting stone fraction passes through a magnet drum to separate ferrous metals from the aggregate material.
• Once the heavy stones are removed in the washing process, the wood fraction passes through an integral trommel drum for final washing and fines removal. Any resulting fines are put back in to the composting process whilst process water is in a closed-loop system, with a Lamellar Clarifier being used for cleaning sediment out of the water
• The separated wood fraction can contain rigid plastics, which are removed on a hand-picking line. However, this will be upgraded to a fully-automated, Optical Sorting line to efficiently achieve an end product suitable for waste-to-energy plants as a fuel. The clean wood product is then dried and shredded to suit the size requirement of its end user.