Newly installed aerators at the Legana Sewage Treatment Plant are delivering reduced odours for locals and better treatment quality, as TasWater completes another instalment of its five-year $1.9 billion network investment.
TasWater Head of Operational Support and Improvement, Anthony Allan, said that Legana’s surging population in recent years has put some pressure on the treatment plant.
“As the town’s population has grown, so have demands on the Legana Sewage Treatment Plant, which has faced operational challenges and odour complaints,” Mr Allan said.
The new aerators, which were also installed at Bridport in 2023, offer enhanced performance by mechanically infusing wastewater with oxygen — a critical step for breaking down organic material and keeping odour in check.
“The results at Bridport were impressive,” Mr Allan said.
“The aerators not only improved effluent quality, but also virtually eliminated odour issues.
“Legana’s population is expected to continue to increase over the next decade and these upgrades will help us manage that future growth.”
By adding oxygen directly to the wastewater, the aerators support the lagoon system’s natural biological processes, which in turn reduce the need for costly chemicals.
“Switching to aerators has streamlined operations and enhanced safety for our team.
“It’s also a better outcome for the environment and the community.”
The new system was installed between August and September 2024 and was commissioned in early October 2024.
While additional monitoring instruments are still being phased in, initial results have been promising, with improved oxygen levels in the plant’s primary lagoon and no odour complaints since the upgrade.
TasWater said it is investing $1.9 billion in its network over the next five years to ensure it can continue to deliver exceptional water and sewerage services for a thriving Tasmania.
