International market
2026-10-21Introduction: 2026年10月7日, the New South Wales Government has unveiled the Badu Yarragul Water Resource Recovery Facility (formerly Upper South Creek Advanced Water Recycling Centre) located at Kemps Creek in Western Sydney. The project cost is AUD 12亿, with an operational capacity of 3500万 liters/day, planned for upgrade to 7000万 liters/day, adopting a Membrane Bioreactor (MBR) + Reverse Osmosis (RO) dual-membrane process, complemented by a 4 MW photovoltaic power station to meet half of the facility's electricity demand.
A Water Plant Built for "Growth"
To understand this facility, one must first understand what it serves. Badu Yarragul is located at Kemps Creek in Western Sydney, adjacent to the Aerotropolis area where the under-construction Western Sydney Airport and the new Bradfield City are situated. It does not undertake the task of upgrading sewage treatment standards in old urban areas, but rather provides incremental infrastructure for new population and industry.
In the initial phase of operation, the facility serves more than 14万 new residential and commercial connections; upon completion of the upgrade, this number will increase to more than 28万. In other words, this is a facility planned and constructed in sync with urban expansion—urban planning comes first, then the water plant capacity, rather than the water plant passively catching up with population growth.
This difference in sequence determines the difference in technology selection. When treating and reusing wastewater from new development areas, water quality requirements are determined by end use, allowing a one-step design based on the dual-membrane process; whereas retrofitting built-up areas is often constrained by existing structures and land availability, more commonly adopting a compromise approach of "upgrading standards + partial reuse."
Why the Dual-Membrane Process Has Become the Default Choice for New Projects
The process route at Badu Yarragul is MBR + RO. The widespread adoption of this route in large-scale municipal reclaimed water projects is backed by clear techno-economic logic.
- MBR as pre-treatment—membrane separation replaces the secondary clarifier, producing effluent with extremely low suspended solids and stable water quality that can directly serve as RO feedwater, eliminating intermediate steps such as sand filtration and activated carbon in conventional advanced treatment; meanwhile, the sludge concentration in the biological stage can be maintained at a higher level, significantly reducing footprint compared to conventional activated sludge processes;
- RO as the safeguard—removing dissolved salts and trace organic compounds, enabling the effluent to meet high-demand uses such as industrial cooling and boiler make-up, and reserving a technical interface for potential future indirect potable reuse;
- Biosolids outlet—the excess biosolids generated by the facility are utilized for agriculture and forestry, turning sludge from a "disposal cost" into a "resource product."
It is worth noting that modular expansion was considered from the design stage: initially built and commissioned at 35 MLD, with subsequent expansion to 70 MLD. This approach of "phased construction with reserved interfaces" avoids excessive occupation of initial investment by long-term demand, and allows the operator to decide the timing of expansion based on the actual pace of population intake.
4 MW Photovoltaics: A Restructuring of the Water Plant's Energy Bill
The 4 MW photovoltaic power station built as part of the facility is designed to meet half of the facility's electricity demand. For a 35 MLD reclaimed water plant with a dual-membrane process, this is not a negligible figure—the membrane scouring aeration of MBR and the high-pressure pumping of RO are themselves two major power consumers.
The significance of installing photovoltaics at a water plant goes beyond "self-generation for self-consumption to save on electricity bills." It is actually responding to an increasingly stringent requirement: the carbon footprint of reclaimed water. When reclaimed water is used to replace tap water for industrial users, the user's carbon reduction accounting will trace back to the water production stage. If reclaimed water production relies on fossil-fuel electricity, the user's Scope 2 emissions are merely transferred, not eliminated. Offsetting half of the electricity consumption with photovoltaics is equivalent to directly cutting the carbon intensity per unit of reclaimed water by a considerable margin.
The project has also set clear sustainability rating targets: at least achieving an Infrastructure Sustainability Council (ISC) Gold rating, and striving for Platinum. Such third-party ratings are standard practice in infrastructure projects in developed countries, converting difficult-to-quantify factors such as energy consumption, materials, ecological impact, and community engagement into comparable scores.
Delivery Model: Construction and Operation Bundled Together
The project was undertaken by a consortium comprising John Holland, Trility, GHD, and Jacobs under a "build + operate" model, with construction commencing in 2023年8月 and the first phase completed in approximately three years.
Bundling design, construction, and operation into a single consortium is standard practice for long-cycle water projects of this kind, for a very practical reason: only when the operator participates in design will it take responsibility for O&M costs twenty years down the line. If design, construction, and operation are separated, the designer tends to produce drawings at the lowest capital cost, the builder tends to build to those drawings, and the operator ends up inheriting a set of assets that are difficult to maintain and relatively energy-intensive. The consortium model aligns the incentives across these three stages and also allows the government owner to impose whole-of-life cost requirements at the tender stage.
This has direct reference value for China's ongoing reforms toward "plant-network integration" and "payment by performance"—both address the same problem: making decision-makers accountable for long-term operational consequences.
The Next Incremental Scenario: Cooling Water for Data Centers
In the same industry information that unveiled Badu Yarragul, there is another easily overlooked disclosure: the planned wastewater treatment plant at Camellia-Rosehill in Sydney (expected to be commissioned before 2032年) will also supply Reclaimed Water to data centers.
This is a significant piece of information. The NSW Department of Planning, Housing and Infrastructure disclosed that the state's major projects pipeline already includes 18 data center projects, with a total value of approximately A$612.2亿. Data centers are典型 high-water-consumption facilities—evaporative cooling and liquid cooling systems require a continuous and stable makeup water supply, and have explicit water quality requirements (controlling scaling, corrosion, and microorganisms).
Reclaimed Water fits this need precisely: stable volume, unaffected by dry seasons, and controllable quality after RO treatment. More importantly, data centers typically have long-term, predictable water supply contracts, which gives Reclaimed Water projects, for the first time, a commercial-grade stable paying customer, without having to rely on the scattered and unstable demand of municipal miscellaneous uses.
For domestic enterprises, this is a new variable worth watching. As computing infrastructure accelerates, "water—energy—computing" are being bound into a single whole: data centers need power, need water, and also need low PUE and low WUE. Whoever can turn Reclaimed Water supply and cooling systems into an integrated solution will be able to enter a customer group that water utilities have never previously served.
Conclusion
A$12亿, 35 to 70 MLD, MBR plus RO, 4 MW of photovoltaics, a connection capacity of the 200,000 scale—what Badu Yarragul demonstrates is not a breakthrough in any single technology, but a complete Reclaimed Water infrastructure paradigm oriented toward growth: planning first, phased construction, dual-membrane water quality assurance, photovoltaics to lower the carbon footprint, a consortium taking charge of the whole life cycle, and future data center water demand factored into the design in advance. For cities entering the "incremental quality improvement" stage, this combination is a checklist that can be directly benchmarked.
About TIANYI TECH: TIANYI TECH (TIANYI LIMITED) focuses on the fields of wastewater treatment, Reclaimed Water Reuse, and Water Environment Governance, providing municipal and industrial clients with full-chain services including process design, equipment integration, engineering general contracting, and Smart Water operations. The company continuously tracks global water treatment policies, technologies, and market dynamics, and is committed to helping clients achieve efficient water resource utilization and sustainable management through reliable solutions. For more information, please visit the company website at www.tianyitech.hk.
Source: Construction Review Online, "A$1.2B Badu Yarragul Water Resource Recovery Facility: Sydney Water Opens Plant" (2026年10月7日), compiled from public information released by the New South Wales Government and Sydney Water.
