The Portarlington Water Recycling Plant (WRP), covering 120 hectares with 80 hectares devoted to tree lots, has been operational since 1982 and primarily uses a unique lagoon system for water treatment and storage. The system consists of four lagoons working in pairs in a batch mode, where facultative lagoons (1 and 2) alternate with maturation lagoons (3 and 4) to achieve Class C recycled water quality. This treated water supports onsite irrigation and a transfer pump feeds recycled water to local vineyards and a golf course.
The current system faces challenges such as managing algal blooms and seasonal water levels to ensure adequate storage capacity. To enhance water quality and expand reuse options, the project is to install a Salt Reduction Plant (SRP) capable of producing 3.0 ML/day of Class B salt-reduced recycled water. The SRP will involve several treatment steps including coarse screening, ultrafiltration, reverse osmosis and chlorination, aiming to reduce salinity and meet strict water quality targets. This upgrade is crucial for meeting growing demand for recycled water on the Peninsula, potentially reaching up to 1,250 ML/year.
Scope of works involves the design, supply, modify, construction, commissioning and testing of new:
- Coarse Screen
- Dissolved Air Flotation Filtration (DAFF) system
- Filtrate Tank
- Membrane Filtration System
- RO Feed Tank
- Cartridge Filters
- Reverse Osmosis System
- Permeate Blending and Disinfection
- Brine Blending system
- Chemical Dosing systems
- Sludge Handling system
- Associated pipework and pumps
- Earthworks comprising foundations for all equipment and buildings.
- Plant buildings
