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Floating Wetlands Slash Methane Emissions
7 Sep
Summary
- Floating wetlands reduced methane emissions by up to 66% in a two-year trial.
- Carbon dioxide fell by 36% and nitrous oxide by 18% with wetland platforms.
- Nature-based solution proven effective for wastewater treatment emissions.
A two-year field trial conducted at a Westernport Water treatment facility on Phillip Island, Victoria, has revealed that installing floating wetlands can drastically cut greenhouse gas emissions. Published on August 25, 2026, the study found methane emissions were reduced by up to 66%.
Researchers from RMIT University, CSIRO, and Westernport Water observed significant drops in other emissions too. Carbon dioxide levels decreased by up to 36%, and nitrous oxide fell by 18% compared to a control lagoon. This innovative approach uses native plants grown on floating platforms.
The root systems of these plants fostered microbial communities that processed pollutants and gases. Lead author Dr. Lukas Schuster highlighted this as the first large-scale evidence of nature-based solutions reducing emissions without high-tech systems, transforming wastewater treatment into a climate solution.
The trial showed clear emission reductions within four months, even with unchanged nutrient levels. This method is particularly beneficial for utilities aiming for net-zero targets, as methane has a potent warming effect. Floating platforms offer a cost-effective way to enhance existing facilities.
Beyond emissions, the plant roots also acted as natural filters, capturing heavy metals and pollutants. This success has prompted wider trials on farm dams across regional Victoria, acknowledging that Australia's numerous farm dams are a significant source of agricultural methane.
