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Neerabup BioVision ARRT Facility

The Neerabup BioVision ARRT Facility is located 31 kilometres from Perth in Western Australia and has the capacity to process up to 100,000 tonnes of mixed solid waste each year, coverting approximately 70% of recovered material into premium market-quality compost.

The facility uses a two-stage composting system to process the mixed solid waste (MSW) from Mindarie Regional Council (MRC), Western Australia's large waste management authority, managing the collection, disposal and treatment of waste by some 500,000 residents living in its locality. The MRC is composed of seven member Councils: the City of Wanneroo, City of Stirling, City of Perth, City of Joondalup, Town of Cambridge, Town of Vincent and Town of Victoria Park.

The facility produces around 40,000 tonnes of high quality mixed source compost each year.

Rapid Initial Aerobic Composting

This process involves composting the MSW over three days in a drum composter - a large, rotating steel cyclinder.  The material is seeded with bacteria from previous batches of composted material, trapped in steel channels in the drum.  This rapidly begins the decomposition of new material, aided by aeration of the material via constant rotation of the drum.  Initial composting also dries the material, separating the organic material from the non-organic contaminants.

Material is then ejected from the drum composter and refined using a trommel - a large, rotating cyclindrical sieve which allows fine, composted oganics to fall through the trommel wall as it rotates. A windsifter is used to remove light contaminants, some of which can be recycled.

Further Aerobic Composting

The composted refined organics are loaded into bays in an enclosed composting hall.  Every one to three days a turning machine mixes the material in each bay and rolls it further along the bay.  Water is also added as needed, and air is blown up through the compost.  By optimising oxygen, moisture and temperature levels this process maintains optimal conditions for breakdown of the waste, producing high quality mixed source compost within approximately 28 days.

Following this stage, the compost is further refined and processed to ensure it meets end use specifications.

Iron-based metals are removed with large magnets, oversized contaminants are removed for disposal and the remaining fine matierals are crushed, reducing any glass to a sand-like consistency.

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2014 Winner Environmental Sustainability