Unitywater is undertaking a major improvement to the treatment of sewage flows which are currently treated at the existing Suncoast Sewage Treatment Plant (STP), located off Finland Road on the western side of the Sunshine Motorway.
Unitywater’s innovative solution to cater for growth in several Sunshine Coast suburbs will save close to $20 million in capital works and improve environmental outcomes.
The Suncoast STP caters for South Marcoola, Mudjimba, Pacific Paradise and Twin Waters. This plant was last upgraded in 1998, is operating beyond its design capacity and requires improvement works to cater for anticipated population growth in these catchments.
We plan to shut down this Suncoast STP and we are constructing a pipeline to the Maroochydore STP, avoiding the need for a costly upgrade of the Suncoast facility. The Maroochydore STP has sufficient capacity to treat additional flows.
Council’s original plan to expand the Suncoast facility was estimated to cost $34 million. Through integrating our sewage treatment plants we are able to be more efficient and keep prices as low as possible for our customers.
Building this pipeline to a plant which has additional capacity is a much less expensive and more environmentally-friendly solution.
This $11 million project includes the construction of a six-kilometre transfer pipeline to connect the existing sewerage network for South Marcoola, Mudjimba, Pacific Paradise and Twin Waters, to the Maroochydore Sewage Treatment Plant. A section of this transfer pipeline will be laid underneath the Maroochy River and Bradman Avenue.
Construction commenced in May 2012 and is expected to be completed by mid 2014, weather permitting.
The Suncoast STP will be decommissioned following the successful completion, testing and commissioning phases of the new sewerage rising main and sewage pumping station, in the second half of 2014.
||Finland Road, Marcoola
The closure of the Suncoast Sewage Treatment Plant and transfer of flows to the Maroochydore Sewage Treatment Plant for full treatment will:
- cater for the increasing population in the area;
- improve the standard of treatment provided;
- reduce the impact on the environment;
- improve the quality of the Maroochy River; and
- better utilise existing sewage treatment assets.
- Sewerage pipeline from Maroochydore STP to river drill - Unitywater Construction Services
- Horizontal directional drilling under Maroochy River - Coe Drilling
- Rising sewerage main from the river drill to Suncoast STP – a construction partner is yet to be determined.
- Sewage pump station - a construction partner is yet to be determined.
||Commissioning is expected to commence in July 2014.
Background and Details
The Suncoast Sewage Treatment Plant (STP) was originally constructed in 1988 and was last upgraded in 1998 with the construction of a new solids handling facility.
This sewage treatment plant currently treats an Average Dry Weather Flow (ADWF) of 3.5 million litres/day. Treated effluent from the plant is currently discharged to mid reaches of the Maroochy River.
Unitywater carried out extensive investigations into the options to provide a treatment capacity of approximately 4.5 million litres / day to meet anticipated growth in the region. The best option identified was the closure of the Suncoast STP and the transfer of the sewage flows to the existing Maroochydore Sewage Treatment Plant where capacity exists to fully treat these flows.
By maximising the use of existing assets and deferring the need for expensive infrastructure upgrades Unitywater will provide a cost saving of around $20 million to the community.
The treatment of the Suncoast flows at the existing Maroochydore Sewage Treatment Plant will improve the water quality of the mid reaches of the Maroochy river and result in a healthier river for the community.
Unitywater’s selected option to transfer the Suncoast STP sewage flows to the Maroochydore STP for full treatment will provide Unitywater with an improved and more flexible operating network and will improve the utilisation of our existing sewage treatment assets at Kawana and Maroochydore. The selected option will also provide significant environmental benefits to the community.
If you have any questions or would like more information, please contact us.
Map of the Suncoast Sewage Treatment Plant catchment area
Aerial view of the existing Suncoast Sewage Treatment Plant
Drill rig arriving
Drill rig in operation at drilling site, near the Maroochydore Multi Sports Complex off Bradman Avenue, Maroochydore
Rock cutter and drills
Pipeline ready to install
Pilot hole exit location on northern side of Maroochy River