Cleaner beaches and major water savings will be the chief benefits of the largest Sydney Water construction project ever undertaken on the New South Wales south coast.
The $197 million Illawarra Wastewater Strategy will see an overhaul of the 40-year-old Wollongong sewage treatment plant (STP) including the construction of a major new water recycling plant, high level (tertiary) treatment processes and ultraviolet disinfection systems.
ASSDA member, Roladuct Spiral Tubing, supplied approximately 60 tonnes of grade 316 and 316L stainless spiral tubing and associated fittings in 2mm to 5mm thicknesses for the project.
These materials were provided to Total Process Services for use throughout the Wollongong STP for the majority of the above-ground process lines.
An additional supply of 35 tonnes of grade 316 stainless tube and pipe fittings were provided by ASSDA Major Sponsor, Atlas Specialty Metals.
Sydney Water’s head contractor for the project is the Walter-Veolia Joint Venture. Walter Construction Group (Walter) is responsible for managing the delivery of the project and undertaking civil infrastructure construction at the treatment plants. Veolia Water Systems Australia (Veolia) is responsible for the process, mechanical and electrical design, supply, installation, commissioning and operational advice.
The project’s most dramatic transformations are taking place at the Wollongong sewage treatment plant, where a 21 million litre bioreactor forms the centre-piece of the upgraded plant. Designed to remove organic impurities and nutrients from wastewater, the base of the bioreactor tank was poured over a continuous 15-hour period.
The design approach redirects wastewater from treatment plants at Bellambi and Port Kembla to the Wollongong facility. The Bellambi and Port Kembla plants will be converted to specialised storm-flow treatment facilities which will be used only in extreme wet weather.
The new Wollongong plant will also operate a reuse facility - supplying high quality treated wastewater to BlueScope Steel and cutting demand for fresh water from the local Avon Dam by about 20 percent. The upgraded sewage treatment plant is due for completion in mid 2005. The Illawarra Wastewater Strategy is part of WaterPlan 21, Sydney Water’s long-term strategy for sustainable water and wastewater management.
ASSDA provides technical advice and access to resources on the water and wastewater industries - for details phone 07 3220 0722.
ASSDA Major Sponsor, The Nickel Institute, can provide essential information on waste water. This information is available for download from www.stainlesswater.org.
Standards Australia distributes the Water Services Specification (WS-SPEC:2000) incorporating guidelines for stainless steel. Visit www.standards.com.au for purchase.
This article featured in Australian Stainless Issue 28, May 2004.