In the past decade, blue green algae (cyanobacteria) blooms have been detected in sewage lagoons in most parts of Tasmania. Sampling and anecdotal evidence suggest that the geographic distribution of blooms continues to spread. Blue-green algae blooms can result in the release of a range of toxins into the waterways.
Wastewater managers and lagoon operators need to be mindful of their role in minimising the public and environmental health risks arising from the release of blue-green algae contaminated effluent into the environment.
The Guidelines for Managing Blue Green Algae (Cyanobacteria) in Sewage Treatment Lagoons March 2011 will assist in the development of Contingency Management Plans and provide guidance in relation to monitoring and relevant alert levels. The guidelines include a table and flow chart which summarises suitable trigger values for a variety of end uses, e.g. stock watering, irrigation of agricultural and municipal land, golf course or recreational water uses.
Download the Blue-Green Algae Management Guidelines 2011.