The Toronto Wastewater Treatment Works (WWTW) serves the area from Teralba to Wangi Wangi on the Western side of Lake Macquarie, including the townships of Marmong Point, Bolton Point, Toronto and Rathmines.

It currently treats six megalitres per day and can handle wastewater from a population equivalent to 42,000 people.

Treatment Process

The activated sludge Toronto WWTW provides secondary treatment of the wastewater and is designed to remove nutrients (nitrogen & phosphorus) and provide some disinfection.

The effluent receives screening, flow measurement and odour control at the inlet works followed by biological treatment in two extended aeration tanks. Treated effluent is drawn off to a catch pond before it is discharged.

Waste mixed liquor is thickened on a gravity drainage deck and dewatered through a filter belt press in the biosolids handling facility.


Recycling & Reuse

All treated effluent is discharged via the Lake Macquarie Crossing to the Belmont ocean outfall.

All biosolids produced at the Toronto WWTW are beneficially used for mine site rehabilitation.