Western Water constructed a Waste to Energy facility at the Melton Recycled Water Plant. This facility is operational and accepting liquid food waste for treatment.
Frequently asked questions
What type of waste will be accepted?
Initially, Western Water will be seeking only liquid organic waste.
Liquid organic waste that will be accepted into the Melton RWP Waste to Energy Facility may include the following:
- liquid food manufacturing waste such as Dissolved Air Floatation (DAF) float
- out of spec liquid waste such as soft drink, milk and beer
- grease trap waste, and
- liquified commercial, retail and hospitality food waste.
Contaminants in the liquid waste are required to be extremely low. Packaged waste will not be accepted.
What volumes can Western Water accept?
A liquid receival unit at the Melton RWP will receive the liquid waste via tanker trucks, remove light contamination and create a suitable waste consistency to mix with sewage sludge for co-digestion in the anaerobic digester.
Western Water will accept up to 5,000 kilolitres of liquid organic waste per annum by 2023, following a three year ramp up period. The acceptable waste volumes per annum over the first three years are outlined in the table below.
|Year 1 (2021)||Year 2 (2022)||Year 3 (2023)|
|Waste volume received (kilolitres)||1,000||3,000||5,000|
Beyond 2023, greater waste volumes may be accepted up to 10,000 kilolitres per annum.
How will the waste acceptance be controlled?
A quality management plan (QMP) will govern the waste receival. The QMP will require sampling of waste prior to acceptance.
Sampling may be reduced over time as consistent positive results are achieved.
Any unacceptable waste will be rejected.
Quality parameters will be set similar to Western Water’s existing trade waste acceptance criteria.
There will be a particular focus on parameters that will produce a higher quality of biogas without causing increased treatment costs. For example, parameters such as chemical oxygen demand (COD), carbon to nitrogen ration (C:N), total suspended solids (TSS), volatile suspended solids (VSS), and total kjeldahl nitrogen (TKN) will be assessed.
Will there be any prohibited substances?
In addition to prohibited substances listed in our Trade Waste Acceptance Criteria, Western Water will not accept
- MBAS (Methylene Blue Active Substances)
- Total Phenols
- MCPA (2-methyl-4-chlorophenoxyacetic acid)
- BDE209 (flame retardant)
- BDE47 (flame retardant)
Western Water will give preference to liquid organic waste sourced from manufacturers which have established standard operating procedures and a hazard analysis and critical control point (HACCP) system in place.
Where is the facility located?
The Melton RWP is in close proximity to the Western Freeway. This positions the site to accept organic waste from the west of Melbourne as well as from key centres including Werribee, Ballarat and Geelong.
The facility will be located within the existing Melton RWP, utilising existing assets. Trucks will enter the plant via Butlers Road.
The liquid receival and treatment unit will be installed outside on a bunded concrete slab close to the access road for easy unloading. Trucks will unload their waste, after logging in via a fully automated system, which will track waste type, volume and quality.