Waste Composting Facility

The Waste Composting Facility (WCF) processes over 80,000 tonnes of household waste from the green-topped bins per annum, which is converted to compost.

The steps in the process are as follows:

1. Tipping Floor

Household waste is spread out onto the tipping floor for sorting, where large or dangerous items are removed. Front-end loaders push the waste onto apron feeders, which carry the material to one of the four digesters.

There are four bio-filters which filter out odours from the facility using a mixture of wood chips, organic material and natural micro organisms.

2. Digesters

The WCF’s four digesters are the largest in the southern hemisphere and the hydraulic drive system turning the digesters is the first of its kind in the world. The digesters are positioned on an angle and rotate. Inside the digesters are natural bacteria that start the composting process and generate heat to around 60°C, which destroys any harmful substances and sterilises the material.

3. Screens

After three days in the digesters, the household waste has turned into immature compost. This is unloaded onto a conveyor belt and carefully screened in a trommel to remove all inorganic waste, such as plastic. Magnets remove metal, which is collected for recycling.

4. Aeration Building

The immature compost is spread out in the aeration building, in which the conditions are kept humid so the composting bacteria are at their most active and effective. The compost is regularly aerated, turned and watered, to speed up the compositing process.

5. Final Screens

A complex range of screens removes any remaining inorganic material to ensure high quality compost is produced.

6. Outload Building

The rich, mature compost is now ready for use and is stored in the load-out building.

We welcome you to take a virtual tour of our Waste Composting Facility.

By product
This compost is used to put nutrients back into the soil for improving crops, pastures, parks, verges and gardens.

Environmental outcome
Each year the WCF prevents over 32,000 tonnes of carbon dioxide equivalents (TCO2-e) from entering the atmosphere.