Turning waste into water in the City of Melbourne

More than 60 tonnes of waste have been diverted from landfill thanks to a machine installed by the City of Melbourne that turns food scraps into waste water.

Over the last year, the ORCA aerobic digestion system has used micro-organisms to transform 62 tonnes of food scraps from the busy Degraves street face precinct into greywater, making it one of the most heavily used machines of its type in Australia.

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ORCA Enviro Systems Executive General Manager Tas Papas said micro-organisms in the unit digest the waste, creating wastewater that goes straight into the sewer system via a grease arrestor.

The ORCA is basically a mechanical “stomach” that digests fruit, vegetables, grains, dairy and proteins, so you end up with greywater that is safe to put into the drain without resorting to landfill,” Mr Papas said.

“Degraves Street cafes set aside food waste as part of their daily operations. By diverting the food waste from landfill, we are also able to prevent greenhouse gases from escaping into the environment.

“Over the course of a year, that also means more than 8,000 litres in diesel fuel is saved because fewer trucks are needed on the road.”

Because space is a premium in the city centre, ORCA was chosen to handle the increased volume of food waste being generated from the busy café district.

“The ORCA has helped City of Melbourne to build strong support among local businesses for food recycling efforts and keep the bustling precinct clean and appealing,” Mr Papas said.

The machine was installed in the Degraves Street recycling Facility in May 2017. The ORCA is rolling out across Australia in pubs, shopping centres, food courts and hotels.