[Australia] Dubbo Advanced Water Reclamation Plant Opens on September 8: AUD 7.8 Million, 700 ML Annual Reuse, UV Photocatalytic TiO₂ Advanced Oxidation, Pollutant Degradation Efficiency Increased by About 16 Times

9月8日, the newly built advanced wastewater treatment plant in Dubbo, New South Wales, Australia, was officially opened. The project represents an investment of AUD 780万, with a maximum annual treatment and reuse capacity of 700 megalitres (ML), equivalent to approximately 11% of the city's water consumption; the core process is titanium dioxide (TiO₂) ultraviolet photocatalytic advanced oxidation, which, according to the technology inventor, achieves a decomposition efficiency for recalcitrant pollutants approximately 16 times that of conventional advanced oxidation systems. The project is jointly funded by the municipality and renewable energy company Squadron Energy through a PPP model (the latter contributing AUD 360万).

Two bottles of water were placed side by side at the opening ceremony: one looked as if it had just been scooped from the surface of a septic tank, while the other was as clear as rainwater. This is not magic, but a demonstration of the treatment performance of Dubbo's newly completed advanced wastewater treatment plant. On 9月8日, Dubbo Regional Council Mayor Josh Black and Squadron Energy CEO Rob Wheals jointly pressed the start button, marking the completion of construction of the facility, which took approximately one year to build.

Project Profile: AUD 780万, 700 ML/year, 2 ML/day

• Investment scale — AUD 780万, jointly funded by Dubbo Regional Council and Squadron Energy, with Squadron contributing AUD 360万;
• Treatment capacity — maximum annual treatment and reuse capacity of 700 megalitres (ML), averaging approximately 2 megalitres per day, roughly equivalent to 0.8 standard Olympic swimming pools;
• Water supply share — approximately 10%—11% of Dubbo's existing water demand;
• Construction period — groundbreaking in 2025年8月, completed and opened in 2026年9月;
• Location — within Dubbo's existing wastewater treatment plant, using its effluent directly as influent.

For an inland city, a water substitution rate of 11% is no small figure — it means an equivalent amount of drinking water is released back into the residential water supply system.

Process Route: From Glass Media Filtration to UV Disinfection

The facility's treatment chain is clear and "membrane-free":

• Influent — effluent from the existing wastewater treatment plant;
• Glass media filtration — removal of larger impurities;
• Ozonation — preliminary oxidative decomposition;
• Further oxidation — decomposition of organic matter;
• Activated Carbon — adsorption and "consumption" of residual organic matter;
• UV disinfection;
• Chlorination — ensuring residual chlorine for pipeline distribution.

The core installation is the titanium dioxide (TiO₂) photocatalytic advanced oxidation system developed by water scientist Troy Warry. Unlike conventional processes, the catalyst is permanently fixed inside the reactor and continuously activated by ultraviolet light. According to Warry, its decomposition efficiency for recalcitrant pollutants is approximately 16 times that of conventional advanced oxidation systems — however, this claim remains the technology provider's self-assessment and awaits independent verification. The technology has previously been trialled in Germany, Spain, and Norway.

It should be emphasized that the mechanism of action differs: conventional filtration processes merely separate pollutants, whereas this route chemically decomposes them, targeting pesticides, petroleum hydrocarbons, pharmaceutical residues, antibiotics, hormones, and other persistent organic compounds.

Why Inland Cities Need a "Membrane-Free Route"

Professor Stuart Kahn of the School of Civil Engineering at the University of Sydney points out that such technologies hold particular significance for inland communities. The reason is that membrane processes such as Reverse Osmosis / RO produce high-concentration brine, and in inland areas, brine disposal itself is a thorny problem — there is no nearby sea for discharge, and evaporation crystallization is costly.

Chris Godfrey, Water and Sewerage Strategy Manager at Dubbo Regional Council, said the system's uniqueness lies in the fact that the Advanced Oxidation stage uses an ultraviolet-light-activated titanium dioxide catalytic unit, and "as far as I know, there is no comparable facility in Australia or anywhere in the Southern Hemisphere." He also made clear that the municipal authority "is not currently seeking approval to use this water for drinking purposes."

Who Is Using the Water: The Wind Farm Construction Phase Pays First

This is not simply a municipal project, but a typical PPP arrangement. During the construction of the Spicers Creek Wind Farm and the Uungula Wind Farm, Squadron Energy will draw approximately 400 megalitres per year of Reclaimed Water, primarily for activities such as construction dust suppression.

• Near-term use — dust suppression during wind farm construction; may be extended to concrete mixing pending approval;
• Medium-term use — municipal sports field irrigation and other landscaping water uses (to be determined after water quality testing by the University of Newcastle system);
• Long-term goal — to provide a reliable supplementary water source for the city during droughts, safeguarding public green spaces and urban landscape water use.

Both Warry and the municipal authority emphasized that the project's longer-term significance lies in changing the role of sewage — from "waste requiring disposal" to "a dispatchable new water source," supplementing conventional water sources against the backdrop of drought, population growth, and increasing rainfall uncertainty.

Three Observations

• The "membrane-free" exploration of the technical route is worth attention — at a time when membrane processes have become almost standard for Reclaimed Water, the non-membrane Advanced Oxidation route, with its approach of "decomposition rather than separation," avoids the secondary disposal problem of concentrated brine, making it particularly well-suited to inland water-scarce regions;
• Performance claims need engineering data to back them up — the 16-fold efficiency improvement is currently still a claim by the technology provider; the University of Newcastle's subsequent water quality testing and long-term operational data are the key to judging the technology's scalability;
• The PPP structure offers a new financing paradigm — an energy company with a clear water demand provides upfront funding and locks in baseline usage, while the municipality gains a guaranteed user and retains room for future expansion. This combination of "demand-side funding + municipal operation" has direct reference value for the financial balance of regional Reclaimed Water projects.

What It Means for Us: TIANYI TECH's Assessment

TIANYI TECH has long served municipal and Industrial Park wastewater treatment and Reclaimed Water Reuse clients. We believe this case offers two insights: first, the selection of Reclaimed Water processes should be worked backward from "receiving conditions" — inland areas without ocean discharge conditions need to carefully evaluate the full-process disposal cost of membrane-process concentrated brine, rather than merely comparing water production costs; second, if an "anchor user" with stable usage can be locked in during the early stage of a project, the project's financial model will improve significantly — a point that also holds true in point-to-point reuse scenarios in Industrial Parks. The success or failure of Reclaimed Water projects often lies beyond the process itself.

About TIANYI LIMITED: TIANYI TECH is deeply engaged in the field of wastewater treatment and Reclaimed Water Reuse, committed to providing efficient, low-carbon, and sustainable water treatment solutions for municipal and industrial clients.