Eraring Energy – Australia
In order to meet Eraring Energy’s water needs, Veolia Water Technologies proposed that secondary treated effluent from the Dora Creek wastewater treatment plant be reused to provide the power station a drought-proof water supply and to allow Zero Liquid Discharge (ZLD).
Project BackgroundNew South Wales, AUSTRALIA -- Eraring Energy (formerly Pacific Power) operates a 2,640 MW coal-fired power station facility near Lake Macquarie, a tidal saline lake in New South Wales (Australia), located near the coast.
The plant supplies 25% of the power needed in New South Wales.
The Client’s NeedsDue to an intermittent existing water supply and a competition with domestic needs, Eraring Energy had to find a drought-proof water supply for its power station. Secondary treated sewage from the Dora Creek wastewater treatment plant (operated by Hunter Water Corporation) was discharged into the environmentally sensitive Lake Macquarie. A 17-km long pipeline was to be built to an ocean outfall. The pipeline layout was running by the power station.
Project & Technology SolutionsIn order to meet Eraring Energy’s water needs, Veolia Water Technologies proposed that secondary treated effluent from the Dora Creek wastewater treatment plant be reused to provide the power station a drought-proof water supply and to allow Zero Liquid Discharge (ZLD). In 1995, Eraring Energy and Veolia entered into a contract for the design and build of such reuse facility. Secondary treated sewage from Dora Creek is fed to three Continous Microfiltration (CMF) units, followed by three Reverse Osmosis (RO) units. This technology produces very high quality feed water for the boiler deioniser and for non potable water applications within the Eraring Energy station. Backwash from the CMF units is sent to Eraring Energy’s on-site wastewater treatment facility and is recycled back into the process. The original Design and Build contract agreed in 1995 treated 1,500 m3/d and was expanded to treat 4,000 m3/d in 2000. Hunter Water Corporation agreed a 15-year contract with Eraring Energy to provide a maximum of 5,300 m3/d secondary treated wastewater. Eraring calculated the CMF/RO treatment costs as US$ 0.13/m3 as there is no charge for their in-house generated power.