Scheduled Wastewater Upgrades
Currently there are 13 wastewater treatment plants in the Perth-Mandurah area. Of these, three large plants service the majority of the Perth metropolitan area. These are:
- Beenyup Wastewater Treatment Plant;
- Subiaco Wastewater Treatment Plant; and
- Woodman Point Wastewater Treatment Plant.
The remaining plants service smaller communities to the North East, East and South of Perth.
The current flows and plant capacity of existing wastewater treatment plants in Perth and Mandurah are nearly matched which signifies that treatment plant upgrades are required.
In addition, new wastewater treatment plants will be constructed at Alkimos and East Rockingham to accommodate growth in the North West coastal and Southern corridors of Perth. These plants are at advanced stages of planning. Alkimos is due to be commissioned in 2011 and East Rockingham by 2015.
Major capital works of over $2 billion are scheduled for delivery over the next 10 years to increase the capacity of the existing wastewater systems and to build the two new treatment plants.
The new scheme at Alkimos will incorporate gravity to transport the wastewater to the treatment plant in the long term. In the short to medium term, pumping stations and pressure mains will move around the wastewater. The ocean outlet will initially have capacity to take up to half the long-term volumes of wastewater when water-recycling opportunities are not available.
The Beenyup, Subiaco and Woodman Point wastewater treatment plants are scheduled to have increased capacity and more investment in odour reductions. It is also necessary to replace the existing ocean outlet at the Subiaco plant.
The new plant for East Rockingham is designed for the same medium and long term sewer configuration as Alkimos. The plant will progressively duplicate the existing ocean outlet from East Rockingham to Point Peron. 