Floating wetlands a promising way to decrease wastewater emissions: new research
The first full-scale trial of its kind, this floating wetland cut greenhouse gases by nearly a third over two years.
Wastewater treatment releases significant greenhouse gases, such as carbon dioxide, methane and nitrous oxide, which worsen climate change. Floating wetlands, made of buoyant rafts with native wetland plants, could potentially cut these emissions. A two-year trial on Phillip Island, Victoria showed a 22-31% reduction in overall greenhouse gas emissions when a floating wetland was added to a wastewater lagoon.
Methane emissions dropped by 32-66%, while carbon dioxide and nitrous oxide levels decreased by 24-36% and 18%, respectively. The results were evident within four to seven months of installation. While nutrient removal could be a factor, it's not the sole explanation. Further research is needed to confirm these findings across different wastewater systems and settings.
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